Difference between revisions of "Protocol"

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   |ICON =  
 
   |ICON =  
 
   |HEADING = Heads up!
 
   |HEADING = Heads up!
   |CONTENT = This article is about the protocol for the latest '''stable''' release of Minecraft '''computer edition'''. For the computer edition pre-releases, see [[Pre-release protocol]]. For Pocket Edition, see [[Pocket Minecraft Protocol]].
+
   |CONTENT = This article is about the protocol for the latest '''stable''' release of Minecraft '''Java Edition''' ([[Protocol version numbers|1.15.2, protocol 578]]). For the Java Edition pre-releases, see [[Pre-release protocol]]. For the incomplete Bedrock Edition docs, see [[Bedrock Protocol]]. For the old Pocket Edition, see [[Pocket Edition Protocol Documentation]].
 
}}
 
}}
  
 
This page presents a dissection of the current '''[https://minecraft.net/ Minecraft] protocol'''.
 
This page presents a dissection of the current '''[https://minecraft.net/ Minecraft] protocol'''.
  
If you're having trouble, check out the [[Protocol FAQ|FAQ]] or ask for help in the IRC channel ([irc://irc.freenode.net/mcdevs #mcdevs on irc.freenode.net]).
+
If you're having trouble, check out the [[Protocol FAQ|FAQ]] or ask for help in the IRC channel [ircs://chat.freenode.net:6697/mcdevs #mcdevs on chat.freenode.net] ([http://wiki.vg/MCDevs More Information]).
  
 
'''Note:''' While you may use the contents of this page without restriction to create servers, clients, bots, etc… you still need to provide attribution to #mcdevs if you copy any of the contents of this page for publication elsewhere.
 
'''Note:''' While you may use the contents of this page without restriction to create servers, clients, bots, etc… you still need to provide attribution to #mcdevs if you copy any of the contents of this page for publication elsewhere.
Line 18: Line 18:
 
== Definitions ==
 
== Definitions ==
  
The Minecraft server accepts connections from TCP clients and communicates with them using ''packets''. A packet is a sequence of bytes sent over the TCP connection. The meaning of a packet depends both on its packet ID and the current state of the connection. The initial state of each connection is [[#Handshaking|Handshaking]], and state is switched using the packets [[#Handshake|Handshake]] ([[#Handshaking|Handshaking]], 0x00, serverbound) and [[#Login Success|Login Success]] ([[#Login|Login]], 0x02, clientbound).
+
The Minecraft server accepts connections from TCP clients and communicates with them using ''packets''. A packet is a sequence of bytes sent over the TCP connection. The meaning of a packet depends both on its packet ID and the current state of the connection. The initial state of each connection is [[#Handshaking|Handshaking]], and state is switched using the packets [[#Handshake|Handshake]] and [[#Login Success|Login Success]].
  
 
=== Data types ===
 
=== Data types ===
Line 41: Line 41:
 
  |-
 
  |-
 
  | XYZ
 
  | XYZ
  | In this document, the axis names are the same as those shown in the debug screen (F3). Y points upwards, X points East, and Z points South.
+
  | In this document, the axis names are the same as those shown in the debug screen (F3). Y points upwards, X points east, and Z points south.
 
  |-
 
  |-
 
  | Meter
 
  | Meter
 
  | The meter is Minecraft's base unit of length, equal to the length of a vertex of a solid block. The term “block” may be used to mean “meter” or “cubic meter”.
 
  | The meter is Minecraft's base unit of length, equal to the length of a vertex of a solid block. The term “block” may be used to mean “meter” or “cubic meter”.
 +
|-
 +
| Global palette
 +
| A table/dictionary/palette mapping nonnegative integers to block states. Block state IDs are created in a linear fashion based off of order of assignment.  One block state ID allocated for each unique block state for a block; if a block has multiple properties then the number of allocated states is the product of the number of values for each property.  A current list of properties and state ID ranges is found on [https://pokechu22.github.io/Burger/1.15.2.html burger].
 +
 +
Alternatively, the vanilla server now includes an option to export the current block state ID mapping, by running <code>java -cp minecraft_server.jar net.minecraft.data.Main --reports</code>.  See [[Data Generators]] for more information.
 +
|-
 +
| Notchian
 +
| The official implementation of vanilla Minecraft as developed and released by Mojang.
 
  |}
 
  |}
  
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  | Length
 
  | Length
 
  | VarInt
 
  | VarInt
  | Length of packet data + length of the packet ID
+
  | Length of Packet ID + Data
 
  |-
 
  |-
 
  | Packet ID
 
  | Packet ID
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=== With compression ===
 
=== With compression ===
  
Once a [[#Set Compression|Set Compression]] packet is sent, [[wikipedia:Zlib|zlib]] compression is enabled for all following packets. The format of a packet changes slighty to include the size of the uncompressed packet.
+
Once a [[#Set Compression|Set Compression]] packet (with a non-negative threshold) is sent, [[wikipedia:Zlib|zlib]] compression is enabled for all following packets. The format of a packet changes slighty to include the size of the uncompressed packet.
  
 
{| class=wikitable
 
{| class=wikitable
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  |rowspan="2"| Yes
 
  |rowspan="2"| Yes
 
  | Packet ID
 
  | Packet ID
  | Varint
+
  | VarInt
 
  | zlib compressed packet ID (see the sections below)
 
  | zlib compressed packet ID (see the sections below)
 
  |-
 
  |-
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If Data Length is set to zero, then the packet is uncompressed; otherwise it is the size of the uncompressed packet.
 
If Data Length is set to zero, then the packet is uncompressed; otherwise it is the size of the uncompressed packet.
  
If compressed, the uncompressed length of (Packet ID + Data) must be equal to or over the threshold set in the packet [[#Set Compression 2|Set Compression]] ([[#Login|Login]], 0x03, clientbound), otherwise the receiving party will disconnect.
+
If compressed, the uncompressed length of (Packet ID + Data) must be equal to or over the threshold set in the packet [[#Set Compression|Set Compression]], otherwise the receiving party will disconnect.
  
Compression can be disabled by sending the packet [[#Set Compression 2|Set Compression]] ([[#Login|Login]], 0x03, clientbound) with a Threshold of -1.
+
Compression can be disabled by sending the packet [[#Set Compression|Set Compression]] with a negative Threshold, or not sending the Set Compression packet at all.
  
 
== Handshaking ==
 
== Handshaking ==
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  | Protocol Version
 
  | Protocol Version
 
  | VarInt
 
  | VarInt
  | See [[protocol version numbers]] (currently 47)
+
  | See [[protocol version numbers]] (currently 578 in Minecraft 1.15.2)
 
  |-
 
  |-
 
  | Server Address
 
  | Server Address
  | String
+
  | String (255)
  | hostname or IP, e.g. localhost or 127.0.0.1<!-- does this support IPv6? -->
+
  | Hostname or IP, e.g. localhost or 127.0.0.1, that was used to connect. The Notchian server does not use this information. Note that SRV records are a complete redirect, e.g. if _minecraft._tcp.example.com points to mc.example.org, users connecting to example.com will provide mc.example.org as server address in addition to connecting to it.
 
  |-  
 
  |-  
 
  | Server Port
 
  | Server Port
 
  | Unsigned Short
 
  | Unsigned Short
  | default is 25565
+
  | Default is 25565.  The Notchian server does not use this information.
 
  |-
 
  |-
 
  | Next State
 
  | Next State
  | VarInt
+
  | VarInt Enum
 
  | 1 for [[#Status|status]], 2 for [[#Login|login]]
 
  | 1 for [[#Status|status]], 2 for [[#Login|login]]
 
  |}
 
  |}
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See [[Server List Ping#1.6]] for the details of the protocol that follows this packet.
 
See [[Server List Ping#1.6]] for the details of the protocol that follows this packet.
  
== Play ==
+
== Status ==
 +
{{Main|Server List Ping}}
  
 
=== Clientbound ===
 
=== Clientbound ===
  
==== Keep Alive ====
+
==== Response ====
  
The server will frequently send out a keep-alive, each containing a random ID. The client must respond with the same packet. If the client does not respond to them for over 30 seconds, the server kicks the client. Vice versa, if the server does not send any keep-alives for 20 seconds, the client will disconnect and yields a "Timed out" exception.
+
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
|rowspan="2"| 0x00
 +
|rowspan="2"| Status
 +
|rowspan="2"| Client
 +
|-
 +
| JSON Response
 +
| String (32767)
 +
| See [[Server List Ping#Response]]; as with all strings this is prefixed by its length as a VarInt
 +
|}
 +
 
 +
==== Pong ====
  
 
{| class="wikitable"
 
{| class="wikitable"
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  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x00
+
  |rowspan="1"| 0x01
  |rowspan="1"| Play
+
  |rowspan="1"| Status
 
  |rowspan="1"| Client
 
  |rowspan="1"| Client
  | Keep Alive ID
+
  | Payload
  | VarInt
+
  | Long
  |  
+
  | Should be the same as sent by the client
 
  |}
 
  |}
  
==== Join Game ====
+
=== Serverbound ===
  
See [[Protocol Encryption]] for information on logging in.
+
==== Request ====
  
 
{| class="wikitable"
 
{| class="wikitable"
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  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="7"| 0x01
+
  |rowspan="1"| 0x00
  |rowspan="7"| Play
+
  | Status
  |rowspan="7"| Client
+
| Server
| Entity ID
+
  |colspan="3"| ''no fields''
| Int
 
| The player's Entity ID (EID)
 
|-
 
| Gamemode
 
| Unsigned Byte
 
| 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. Bit 3 (0x8) is the hardcore flag.
 
|-
 
| Dimension
 
| Byte
 
| -1: Nether, 0: Overworld, 1: End
 
|-
 
| Difficulty
 
| Unsigned Byte
 
| 0: peaceful, 1: easy, 2: normal, 3: hard
 
|-
 
| Max Players
 
| Unsigned Byte
 
| Used by the client to draw the player list
 
|-
 
| Level Type
 
| String
 
| default, flat, largeBiomes, amplified, default_1_1
 
|-
 
| Reduced Debug Info
 
| Boolean
 
| If true, a Notchian client shows reduced information on the {{Minecraft Wiki|debug screen}}.
 
 
  |}
 
  |}
  
{{Warning|If the Dimension isn't valid then the client will crash}}
+
==== Ping ====
 
 
==== Chat Message ====  
 
 
 
Identifying the difference between Chat/System Message is important as it helps respect the user's chat visibility options. While Position 2 accepts json formatting it will not display, old style formatting works
 
  
 
{| class="wikitable"
 
{| class="wikitable"
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  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x02
+
  |rowspan="1"| 0x01
  |rowspan="2"| Play
+
  |rowspan="1"| Status
  |rowspan="2"| Client
+
  |rowspan="1"| Server
  | JSON Data
+
  | Payload
  | [[Chat]]
+
  | Long
| Limited to 32767 bytes
+
  | May be any number. Notchian clients use a system-dependent time value which is counted in milliseconds.
  |-
 
| Position
 
| Byte
 
| 0: chat (chat box), 1: system message (chat box), 2: above hotbar
 
 
  |}
 
  |}
  
{{Warning|Malformed JSON will disconnect the client}}
+
== Login ==
  
==== Time Update ====
+
The login process is as follows:
  
Time is based on ticks, where 20 ticks happen every second. There are 24000 ticks in a day, making Minecraft days exactly 20 minutes long.
+
# C→S: [[#Handshake|Handshake]] with Next State set to 2 (login)
 +
# C→S: [[#Login Start|Login Start]]
 +
# S→C: [[#Encryption Request|Encryption Request]]
 +
# Client auth
 +
# C→S: [[#Encryption Response|Encryption Response]]
 +
# Server auth, both enable encryption
 +
# S→C: [[#Set Compression|Set Compression]] (optional)
 +
# S→C: [[#Login Success|Login Success]]
 +
 
 +
Set Compression, if present, must be sent before Login Success. Note that anything sent after Set Compression must use the [[#With_compression|Post Compression packet format]].
 +
 
 +
For unauthenticated ("cracked"/offline-mode) and localhost connections (either of the two conditions is enough for an unencrypted connection) there is no encryption. In that case [[#Login Start|Login Start]] is directly followed by [[#Login Success|Login Success]].
 +
 
 +
See [[Protocol Encryption]] for details.
  
The time of day is based on the timestamp modulo 24000. 0 is sunrise, 6000 is noon, 12000 is sunset, and 18000 is midnight.
+
=== Clientbound ===
  
The default SMP server increments the time by <code>20</code> every second.
+
==== Disconnect (login) ====
  
 
{| class="wikitable"
 
{| class="wikitable"
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  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x03
+
  |rowspan="1"| 0x00
  |rowspan="2"| Play
+
  |rowspan="1"| Login
  |rowspan="2"| Client
+
  |rowspan="1"| Client
  | World Age
+
  | Reason
  | Long
+
  | [[Chat]]
  | In ticks; not changed by server commands
+
  |  
|-
 
| Time of day
 
| Long
 
| The world (or region) time, in ticks. If negative the sun will stop moving at the Math.abs of the time
 
 
  |}
 
  |}
  
==== Entity Equipment ====
+
==== Encryption Request ====
  
 
{| class="wikitable"
 
{| class="wikitable"
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  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x04
+
  |rowspan="5"| 0x01
  |rowspan="3"| Play
+
  |rowspan="5"| Login
  |rowspan="3"| Client
+
  |rowspan="5"| Client
  | Entity ID
+
  | Server ID
 +
| String (20)
 +
| Appears to be empty
 +
|-
 +
| Public Key Length
 
  | VarInt
 
  | VarInt
  | Entity's EID
+
  | Length of Public Key
 
  |-
 
  |-
  | Slot
+
  | Public Key
  | Short
+
  | Byte Array
  | Equipment slot. 0: held, 1–4: armor slot (1: boots, 2: leggings, 3: chestplate, 4: helmet)
+
  |  
 +
|-
 +
| Verify Token Length
 +
| VarInt
 +
| Length of Verify Token. Always 4 for Notchian servers.
 
  |-
 
  |-
  | Item
+
  | Verify Token
  | [[Slot Data|Slot]]
+
  | Byte Array
  | Item in slot format
+
  | A sequence of random bytes generated by the server
 
  |}
 
  |}
  
==== Spawn Position ====
+
See [[Protocol Encryption]] for details.
  
Sent by the server after login to specify the coordinates of the spawn point (the point at which players spawn at, and which the compass points to). It can be sent at any time to update the point compasses point at.
+
==== Login Success ====
  
 
{| class="wikitable"
 
{| class="wikitable"
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  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x05
+
  |rowspan="2"| 0x02
  |rowspan="1"| Play
+
  |rowspan="2"| Login
  |rowspan="1"| Client
+
  |rowspan="2"| Client
  | Location
+
  | UUID
  | Position
+
  | String (36)
  | Spawn location
+
| Unlike in other packets, this field contains the UUID as a string with hyphens.
 +
|-
 +
| Username
 +
| String (16)
 +
  |  
 
  |}
 
  |}
  
==== Update Health ====
+
This packet switches the connection state to [[#Play|play]].
 +
 
 +
{{Warning2|The (notchian) server might take a bit to fully transition to the Play state, so it's recommended to wait before sendings Play packets, either by setting a timeout, or waiting for Play packets from the server (usually [[#Player Info|Player Info]]).
 +
 
 +
The notchian client doesn't send any (non-[[#Keep Alive|keep alive]]) packets until the next tick/[[#Time Update|time update]] packet.
 +
}}
  
Sent by the server to update/set the health of the player it is sent to.
+
==== Set Compression ====
  
Food {{Minecraft Wiki|Food#Hunger vs. Saturation|saturation}} acts as a food “overcharge”. Food values will not decrease while the saturation is over zero. Players logging in automatically get a saturation of 5.0. Eating food increases the saturation as well as the food bar.
+
Enables compression.  If compression is enabled, all following packets are encoded in the [[#With compression|compressed packet format]]. Negative or zero values will disable compression, meaning the packet format should remain in the [[#Without compression|uncompressed packet format]]. However, this packet is entirely optional, and if not sent, compression will also not be enabled (the notchian server does not send the packet when compression is disabled).
  
 
{| class="wikitable"
 
{| class="wikitable"
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  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x06
+
  |rowspan="1"| 0x03
  |rowspan="3"| Play
+
  |rowspan="1"| Login
  |rowspan="3"| Client
+
  |rowspan="1"| Client
  | Health
+
  | Threshold
| Float
+
  | VarInt
| 0 or less = dead, 20 = full HP
+
  | Maximum size of a packet before it is compressed
|-
 
| Food
 
  | VarInt
 
  | 0–20
 
|-
 
| Food Saturation
 
| Float
 
| Seems to vary from 0.0 to 5.0 in integer increments
 
 
  |}
 
  |}
  
==== Respawn ====
+
==== Login Plugin Request ====
 +
 
 +
Used to implement a custom handshaking flow together with [[#Login_Plugin_Response | Login Plugin Response]].
  
To change the player's dimension (overworld/nether/end), send them a respawn packet with the appropriate dimension, followed by prechunks/chunks for the new dimension, and finally a position and look packet. You do not need to unload chunks, the client will do it automatically.
+
Unlike plugin messages in "play" mode, these messages follow a lock-step request/response scheme, where the client is expected to respond to a request indicating whether it understood. The notchian client always responds that it hasn't understood, and sends an empty payload.
  
 
{| class="wikitable"
 
{| class="wikitable"
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  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="4"| 0x07
+
  |rowspan="3"| 0x04
  |rowspan="4"| Play
+
  |rowspan="3"| Login
  |rowspan="4"| Client
+
  |rowspan="3"| Client
  | Dimension
+
  | Message ID
  | Int
+
  | VarInt
  | -1: The Nether, 0: The Overworld, 1: The End
+
  | Generated by the server - should be unique to the connection.
 
  |-
 
  |-
  | Difficulty
+
  | Channel
  | Unsigned Byte
+
  | Identifier
  | 0: Peaceful, 1: Easy, 2: Normal, 3: Hard
+
  | Name of the [[plugin channel]] used to send the data
 
  |-
 
  |-
  | Gamemode
+
  | Data
  | Unsigned Byte
+
  | Byte Array
  | 0: survival, 1: creative, 2: adventure. The hardcore flag is not included
+
  | Any data, depending on the channel. The length of this array must be inferred from the packet length.
|-
 
| Level Type
 
| String
 
| Same as [[#Join Game|Join Game]]
 
 
  |}
 
  |}
  
{{Warning|If the Dimension isn't valid then the client will crash}}
+
=== Serverbound ===
  
{{Warning|Avoid changing player's dimension to same dimension they were already in, weird bugs can occur i.e. such player will be unable to attack other players in new world (fixes after their death and respawn)}}
+
==== Login Start  ====
  
==== Player Position And Look ====
+
{| class="wikitable"
 
+
! Packet ID
Updates the player's position on the server.
+
! State
 
+
! Bound To
If the distance between the last known position of the player on the server and the new position set by this packet is greater than 100 meters, the client will be kicked for “You moved too quickly :( (Hacking?)”.
+
! Field Name
 
+
! Field Type
Also if the fixed-point number of X or Z is set greater than <code>3.2E7D</code> the client will be kicked for “Illegal position”.
+
! Notes
 +
|-
 +
|rowspan="1"| 0x00
 +
|rowspan="1"| Login
 +
|rowspan="1"| Server
 +
| Name
 +
| String (16)
 +
| Player's Username
 +
|}
  
Yaw is measured in degrees, and does not follow classical trigonometry rules. The unit circle of yaw on the XZ-plane starts at (0, 1) and turns counterclockwise, with 90 at (-1, 0), 180 at (0, -1) and 270 at (1, 0). Additionally, yaw is not clamped to between 0 and 360 degrees; any number is valid, including negative numbers and numbers greater than 360.
+
==== Encryption Response ====
 
 
Pitch is measured in degrees, where 0 is looking straight ahead, -90 is looking straight up, and 90 is looking straight down.
 
 
 
The yaw in degrees of a player standing at point (x0, z0) and looking towards point (x, z) can be calculated with:
 
 
 
l = x-x0
 
w = z-z0
 
c = sqrt( l*l + w*w )
 
alpha1 = -arcsin(l/c)/PI*180
 
alpha2 = arccos(w/c)/PI*180
 
if alpha2 > 90 then
 
    yaw = 180 - alpha1
 
else
 
    yaw = alpha1
 
 
 
You can get a unit vector from a given yaw/pitch via:
 
 
 
x = -cos(pitch) * sin(yaw)
 
y = -sin(pitch)
 
z =  cos(pitch) * cos(yaw)
 
  
 
{| class="wikitable"
 
{| class="wikitable"
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  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="6"| 0x08
+
  |rowspan="4"| 0x01
  |rowspan="6"| Play
+
  |rowspan="4"| Login
  |rowspan="6"| Client
+
  |rowspan="4"| Server
  | X
+
  | Shared Secret Length
  | Double
+
  | VarInt
  | Absolute or relative position, depending on Flags
+
  | Length of Shared Secret
 
  |-
 
  |-
  | Y
+
  | Shared Secret
  | Double
+
  | Byte Array
  | Absolute or relative position, depending on Flags
+
  |  
 
  |-
 
  |-
  | Z
+
  | Verify Token Length
  | Double
+
  | VarInt
  | Absolute or relative position, depending on Flags
+
  | Length of Verify Token
 
  |-
 
  |-
  | Yaw
+
  | Verify Token
| Float
+
  | Byte Array
| Absolute or relative rotation on the X Axis, in degrees
+
  |  
|-
 
| Pitch
 
| Float
 
| Absolute or relative rotation on the Y Axis, in degrees
 
|-
 
| Flags
 
  | Byte
 
  | Bit field, see below
 
 
  |}
 
  |}
  
About the Flags field:
+
See [[Protocol Encryption]] for details.
  
<Dinnerbone> It's a bitfield, X/Y/Z/Y_ROT/X_ROT. If X is set, the x value is relative and not absolute.
+
==== Login Plugin Response ====
  
 
{| class="wikitable"
 
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  ! Field
+
  |rowspan="3"| 0x02
  ! Bit
+
  |rowspan="3"| Login
 +
|rowspan="3"| Server
 +
| Message ID
 +
| VarInt
 +
| Should match ID from server.
 
  |-
 
  |-
  | X
+
  | Successful
  | 0x01
+
  | Boolean
 +
| <code>true</code> if the client understands the request, <code>false</code> otherwise. When <code>false</code>, no payload follows.
 
  |-
 
  |-
  | Y
+
  | Data
  | 0x02
+
  | Optional Byte Array
  |-
+
  | Any data, depending on the channel. The length of this array must be inferred from the packet length.
| Z
 
| 0x04
 
|-
 
| Y_ROT
 
| 0x08
 
|-
 
| X_ROT
 
| 0x10
 
 
  |}
 
  |}
  
==== Held Item Change ====
+
== Play ==
  
Sent to change the player's slot selection.
+
=== Clientbound ===
 +
 
 +
==== Spawn Entity ====
 +
 
 +
Sent by the server when a vehicle or other non-living entity is created.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 510: Line 505:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x09
+
  |rowspan="12"| 0x00
  |rowspan="1"| Play
+
  |rowspan="12"| Play
  |rowspan="1"| Client
+
  |rowspan="12"| Client
| Slot
 
| Byte
 
| The slot which the player has selected (0–8)
 
|}
 
 
 
==== Use Bed ====
 
 
 
This packet tells that a player goes to bed.
 
 
 
The client with the matching Entity ID will go into bed mode.
 
 
 
This Packet is sent to all nearby players including the one sent to bed.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="2"| 0x0A
 
|rowspan="2"| Play
 
|rowspan="2"| Client
 
 
  | Entity ID
 
  | Entity ID
 
  | VarInt
 
  | VarInt
  | Sleeping player's EID
+
  | EID of the entity
 
  |-
 
  |-
  | Location
+
  | Object UUID
  | Position
+
  | UUID
  | Block location of the head part of the bed
+
  |  
|}
 
 
 
==== Animation ====
 
 
 
Sent whenever an entity should change animation.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="2"| 0x0B
+
  | Type
|rowspan="2"| Play
 
|rowspan="2"| Client
 
| Entity ID
 
 
  | VarInt
 
  | VarInt
  | Player ID
+
  | The type of entity (same as in [[#Spawn Living Entity|Spawn Living Entity]])
 
  |-
 
  |-
  | Animation
+
  | X
  | Unsigned Byte
+
  | Double
  | Animation ID (see below)
+
  |  
  |}
+
  |-
 
+
| Y
Animation can be one of the following values:
+
| Double
 
+
|
{| class="wikitable"
+
|-
  ! ID
+
| Z
  ! Animation
+
  | Double
 +
  |
 
  |-
 
  |-
  | 0
+
  | Pitch
  | Swing arm
+
| Angle
 +
  |  
 
  |-
 
  |-
  | 1
+
  | Yaw
  | Take damage
+
| Angle
 +
  |  
 
  |-
 
  |-
  | 2
+
  | Data
  | Leave bed
+
  | Int
 +
| Meaning dependent on the value of the Type field, see [[Object Data]] for details.
 
  |-
 
  |-
  | 3
+
  | Velocity X
  | Eat food
+
| Short
 +
  |rowspan="3"| Same units as [[#Entity Velocity|Entity Velocity]].  Always sent, but only used when Data is greater than 0 (except for some entities which always ignore it; see [[Object Data]] for details).
 
  |-
 
  |-
  | 4
+
  | Velocity Y
  | Critical effect
+
  | Short
 
  |-
 
  |-
  | 5
+
  | Velocity Z
  | Magic critical effect
+
  | Short
 
  |}
 
  |}
  
==== Spawn Player ====
+
==== Spawn Experience Orb ====
  
This packet is sent by the server when a player comes into visible range, ''not'' when a player joins.
+
Spawns one or more experience orbs.
 
 
This packet must be sent after the [[#Player List Item|Player List Item]] ([[#Play|Play]], 0x38, clientbound) packet that adds the player data for the client to use when spawning a player. If the tab list entry for the UUID included in this packet is not present when this packet arrives, the entity will not be spawned. The tab includes skin/cape data.
 
 
 
Servers can, however, safely spawn player entities for players not in visible range. The client appears to handle it correctly.
 
 
 
When in online-mode the UUIDs must be valid and have valid skin blobs, in offline-mode UUID v3 is used.
 
 
 
For NPCs UUID v2 should be used. Note:
 
 
 
<+Grum> i will never confirm this as a feature you know that :)
 
 
 
In an example UUID, <code>xxxxxxxx-xxxx-Yxxx-xxxx-xxxxxxxxxxxx</code>, the UUID version is specified by <code>Y</code>. So, for UUID v3, <code>Y</code> will always be <code>3</code>, and for UUID v2, <code>Y</code> will always be <code>2</code>.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 619: Line 567:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="9"| 0x0C
+
  |rowspan="5"| 0x01
  |rowspan="9"| Play
+
  |rowspan="5"| Play
  |rowspan="9"| Client
+
  |rowspan="5"| Client
 
  | Entity ID
 
  | Entity ID
 
  | VarInt
 
  | VarInt
| Player's EID
 
|-
 
| Player UUID
 
| UUID
 
 
  |  
 
  |  
 
  |-
 
  |-
 
  | X
 
  | X
  | Int
+
  | Double
  | Player X as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  |  
 
  |-
 
  |-
 
  | Y
 
  | Y
  | Int
+
  | Double
  | Player Y as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  |  
 
  |-
 
  |-
 
  | Z
 
  | Z
  | Int
+
  | Double
| Player Z as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
 
|-
 
| Yaw
 
| Angle
 
 
  |  
 
  |  
 
  |-
 
  |-
  | Pitch
+
  | Count
| Angle
 
|
 
|-
 
| Current Item
 
 
  | Short
 
  | Short
  | The item the player is currently holding. Note that this should be 0 for “no item”, unlike -1 used in other packets.
+
  | The amount of experience this orb will reward once collected
|-
 
| Metadata
 
| [[Entities#Entity Metadata Format|Metadata]]
 
|
 
 
  |}
 
  |}
  
{{Warning|A negative Current Item crashes clients}}
+
==== Spawn Weather Entity ====
  
{{Warning|The client will crash if no Metadata is sent}}
+
With this packet, the server notifies the client of thunderbolts striking within a 512 block radius around the player. The coordinates specify where exactly the thunderbolt strikes.
 
 
==== Collect Item ====
 
 
 
Sent by the server when someone picks up an item lying on the ground — its sole purpose appears to be the animation of the item flying towards you. It doesn't destroy the entity in the client memory, and it doesn't add it to your inventory. The server only checks for items to be picked up after each [[#Player Position|Player Position]] (and [[#Player Position And Look|Player Position And Look]]) packet sent by the client.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 675: Line 603:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x0D
+
  |rowspan="5"| 0x02
  |rowspan="2"| Play
+
  |rowspan="5"| Play
  |rowspan="2"| Client
+
  |rowspan="5"| Client
  | Collected Entity ID
+
  | Entity ID
 
  | VarInt
 
  | VarInt
 +
| The EID of the thunderbolt
 +
|-
 +
| Type
 +
| Byte Enum
 +
| The global entity type, currently always 1 for thunderbolt
 +
|-
 +
| X
 +
| Double
 +
|
 +
|-
 +
| Y
 +
| Double
 
  |  
 
  |  
  |-  
+
  |-
  | Collector Entity ID
+
  | Z
  | VarInt
+
  | Double
 
  |  
 
  |  
 
  |}
 
  |}
  
==== Spawn Object ====
+
==== Spawn Living Entity ====
  
Sent by the server when an Object/Vehicle is created.
+
Sent by the server when a living entity is spawned.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 699: Line 639:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="11"| 0x0E
+
  |rowspan="12"| 0x03
  |rowspan="11"| Play
+
  |rowspan="12"| Play
  |rowspan="11"| Client
+
  |rowspan="12"| Client
  | Entity ID  
+
  | Entity ID
 
  | VarInt
 
  | VarInt
  | EID of the object
+
  |  
 +
|-
 +
| Entity UUID
 +
| UUID
 +
|
 
  |-
 
  |-
 
  | Type
 
  | Type
  | Byte
+
  | VarInt
  | The type of object (See [[Entities#Objects|Objects]])
+
  | The type of mob. See [[Entities#Mobs]]
 
  |-
 
  |-
 
  | X
 
  | X
  | Int
+
  | Double
  | X position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  |  
 
  |-
 
  |-
 
  | Y
 
  | Y
  | Int
+
  | Double
  | Y position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  |  
 
  |-
 
  |-
 
  | Z
 
  | Z
  | Int
+
  | Double
  | Z position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  |  
 
  |-
 
  |-
  | Pitch
+
  | Yaw
 
  | Angle
 
  | Angle
 
  |  
 
  |  
 
  |-
 
  |-
  | Yaw
+
  | Pitch
 
  | Angle
 
  | Angle
 
  |  
 
  |  
 
  |-
 
  |-
  | Data
+
  | Head Pitch
  | [[Object Data]]
+
  | Angle
 
  |  
 
  |  
 
  |-
 
  |-
 
  | Velocity X
 
  | Velocity X
 
  | Short
 
  | Short
  | Same units as [[#Entity Velocity|Entity Velocity]] (If Data > 0)
+
  | Same units as [[#Entity Velocity|Entity Velocity]]
 
  |-
 
  |-
 
  | Velocity Y
 
  | Velocity Y
 
  | Short
 
  | Short
  | Same units as [[#Entity Velocity|Entity Velocity]] (If Data > 0)
+
  | Same units as [[#Entity Velocity|Entity Velocity]]
 
  |-
 
  |-
 
  | Velocity Z
 
  | Velocity Z
 
  | Short
 
  | Short
  | Same units as [[#Entity Velocity|Entity Velocity]] (If Data > 0)
+
  | Same units as [[#Entity Velocity|Entity Velocity]]
 
  |}
 
  |}
  
==== Spawn Mob ====
+
==== Spawn Painting ====
  
Sent by the server when a Mob Entity is Spawned
+
This packet shows location, name, and type of painting.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 759: Line 703:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="12"| 0x0F
+
  |rowspan="5"| 0x04
  |rowspan="12"| Play
+
  |rowspan="5"| Play
  |rowspan="12"| Client
+
  |rowspan="5"| Client
 
  | Entity ID
 
  | Entity ID
 
  | VarInt
 
  | VarInt
 
  |  
 
  |  
 
  |-
 
  |-
  | Type
+
  | Entity UUID
  | Unsigned Byte
+
  | UUID
  | The type of mob. See [[Entities#Mobs|Mobs]]
+
  |  
 
  |-
 
  |-
  | X
+
  | Motive
  | Int
+
  | VarInt
  | X position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  | Panting's ID, see below
 
  |-
 
  |-
  | Y
+
  | Location
  | Int
+
  | Position
  | Y position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  | Center coordinates (see below)
 
  |-
 
  |-
  | Z
+
  | Direction
  | Int
+
  | Byte Enum
  | Z position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  | Direction the painting faces (North = 2, South = 0, West = 1, East = 3)
 +
|}
 +
 
 +
Calculating the center of an image: given a (width × height) grid of cells, with <code>(0, 0)</code> being the top left corner, the center is <code>(max(0, width / 2 - 1), height / 2)</code>. E.g. <code>(1, 0)</code> for a 2×1 painting, or <code>(1, 2)</code> for a 4×4 painting.
 +
 
 +
List of paintings by coordinates in <code>paintings_kristoffer_zetterstrand.png</code> (where x and y are in pixels from the top left and width and height are in pixels or 16ths of a block):
 +
 
 +
{| class="wikitable"
 +
! Name
 +
! ID
 +
! x
 +
! y
 +
! width
 +
! height
 
  |-
 
  |-
  | Yaw
+
  | <code>minecraft:kebab</code>
  | Angle
+
  | 0
  |  
+
  | 0
 +
| 0
 +
| 16
 +
| 16
 
  |-
 
  |-
  | Pitch
+
  | <code>minecraft:aztec</code>
  | Angle
+
  | 1
  |  
+
  | 16
 +
| 0
 +
| 16
 +
| 16
 +
|-
 +
| <code>minecraft:alban</code>
 +
| 2
 +
| 32
 +
| 0
 +
| 16
 +
| 16
 
  |-
 
  |-
  | Head Pitch
+
  | <code>minecraft:aztec2</code>
  | Angle
+
  | 3
  |  
+
  | 48
 +
| 0
 +
| 16
 +
| 16
 
  |-
 
  |-
  | Velocity X
+
  | <code>minecraft:bomb</code>
  | Short
+
  | 4
  | Same units as [[#Entity Velocity|Entity Velocity]]
+
  | 64
 +
| 0
 +
| 16
 +
| 16
 
  |-
 
  |-
  | Velocity Y
+
  | <code>minecraft:plant</code>
  | Short
+
  | 5
  | Same units as [[#Entity Velocity|Entity Velocity]]
+
  | 80
 +
| 0
 +
| 16
 +
| 16
 
  |-
 
  |-
  | Velocity Z
+
  | <code>minecraft:wasteland</code>
  | Short
+
  | 6
  | Same units as [[#Entity Velocity|Entity Velocity]]
+
  | 96
 +
| 0
 +
| 16
 +
| 16
 
  |-
 
  |-
  | Metadata
+
  | <code>minecraft:pool</code>
  | [[Entities#Entity Metadata Format|Metadata]]
+
  | 7
  |  
+
  | 0
  |}
+
  | 32
 
+
  | 32
==== Spawn Painting ====
+
  | 16
 
 
This packet shows location, name, and type of painting.
 
 
 
Calculating the center of an image: given a (width x height) grid of cells, with (0, 0) being the top left corner, the center is (max(0, width / 2 - 1), height / 2). E.g.
 
 
 
  2x1 (1, 0)
 
  4x4 (1, 2)
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="4"| 0x10
+
  | <code>minecraft:courbet</code>
  |rowspan="4"| Play
+
  | 8
  |rowspan="4"| Client
+
  | 32
  | Entity ID
+
  | 32
  | VarInt
+
  | 32
  |  
+
  | 16
 
  |-
 
  |-
  | Title
+
  | <code>minecraft:sea</code>
  | String
+
  | 9
  | Name of the painting. Max length 13
+
  | 64
 +
| 32
 +
| 32
 +
| 16
 
  |-
 
  |-
  | Location
+
  | <code>minecraft:sunset</code>
  | Position
+
  | 10
  | Center coordinates
+
  | 96
 +
| 32
 +
| 32
 +
| 16
 
  |-
 
  |-
  | Direction
+
  | <code>minecraft:creebet</code>
  | Unsigned Byte
+
  | 11
  | Direction the painting faces. 0: north (-z), 1: west (-x), 2: south (+z), 3: east (+x)
+
  | 128
  |}
+
  | 32
 
+
| 32
==== Spawn Experience Orb ====
+
  | 16
 
 
Spawns one or more experience orbs.
 
 
 
{| class="wikitable"
 
  ! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="5"| 0x11
+
  | <code>minecraft:wanderer</code>
  |rowspan="5"| Play
+
  | 12
  |rowspan="5"| Client
+
  | 0
  | Entity ID
+
  | 64
  | VarInt
+
  | 16
  | Entity's ID
+
  | 32
 
  |-
 
  |-
  | X
+
  | <code>minecraft:graham</code>
  | Int
+
  | 13
  | X position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  | 16
 +
| 64
 +
| 16
 +
| 32
 
  |-
 
  |-
  | Y
+
  | <code>minecraft:match</code>
  | Int
+
  | 14
  | Y position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  | 0
 +
| 128
 +
| 32
 +
| 32
 
  |-
 
  |-
  | Z
+
  | <code>minecraft:bust</code>
  | Int
+
  | 15
  | Z position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  | 32
 +
| 128
 +
| 32
 +
| 32
 
  |-
 
  |-
  | Count
+
  | <code>minecraft:stage</code>
  | Short
+
  | 16
  | The amount of experience this orb will reward once collected
+
  | 64
 +
| 128
 +
| 32
 +
| 32
 +
|-
 +
| <code>minecraft:void</code>
 +
| 17
 +
| 96
 +
| 128
 +
| 32
 +
| 32
 +
|-
 +
| <code>skull_and_roses</code>
 +
| 18
 +
| 128
 +
| 128
 +
| 32
 +
| 32
 +
|-
 +
| <code>minecraft:wither</code>
 +
| 19
 +
| 160
 +
| 128
 +
| 32
 +
| 32
 +
|-
 +
| <code>minecraft:fighters</code>
 +
| 20
 +
| 0
 +
| 96
 +
| 64
 +
| 32
 +
|-
 +
| <code>minecraft:pointer</code>
 +
| 21
 +
| 0
 +
| 192
 +
| 64
 +
| 64
 +
|-
 +
| <code>minecraft:pigscene</code>
 +
| 22
 +
| 64
 +
| 192
 +
| 64
 +
| 64
 +
|-
 +
| <code>minecraft:burning_skull</code>
 +
| 23
 +
| 128
 +
| 192
 +
| 64
 +
| 64
 +
|-
 +
| <code>minecraft:skeleton</code>
 +
| 24
 +
| 192
 +
| 64
 +
| 64
 +
| 48
 +
|-
 +
| <code>minecraft:donkey_kong</code>
 +
| 25
 +
| 192
 +
| 112
 +
| 64
 +
| 48
 
  |}
 
  |}
  
==== Entity Velocity ====
+
The {{Minecraft Wiki|Painting#Canvases|Minecraft Wiki article on paintings}} also provides a list of painting names to the actual images.
 +
 
 +
==== Spawn Player ====
 +
 
 +
This packet is sent by the server when a player comes into visible range, ''not'' when a player joins.
 +
 
 +
This packet must be sent after the [[#Player Info|Player Info]] packet that adds the player data for the client to use when spawning a player. If the Player Info for the player spawned by this packet is not present when this packet arrives, Notchian clients will not spawn the player entity. The Player Info packet includes skin/cape data.
  
Velocity is believed to be in units of 1/8000 of a block per server tick (50ms); for example, -1343 would move (-1343 / 8000) = −0.167875 blocks per tick (or −3,3575 blocks per second).
+
Servers can, however, safely spawn player entities for players not in visible range. The client appears to handle it correctly.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 896: Line 940:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="4"| 0x12
+
  |rowspan="7"| 0x05
  |rowspan="4"| Play
+
  |rowspan="7"| Play
  |rowspan="4"| Client
+
  |rowspan="7"| Client
 
  | Entity ID
 
  | Entity ID
 
  | VarInt
 
  | VarInt
  |  
+
  | Player's EID
 
  |-
 
  |-
  | Velocity X
+
  | Player UUID
  | Short
+
  | UUID
  | Velocity on the X axis
+
  | See below for notes on {{Minecraft Wiki|Server.properties#online-mode|offline mode}} and NPCs
 +
|-
 +
| X
 +
| Double
 +
|
 +
|-
 +
| Y
 +
| Double
 +
|
 +
|-
 +
| Z
 +
| Double
 +
|
 
  |-
 
  |-
  | Velocity Y
+
  | Yaw
  | Short
+
  | Angle
  | Velocity on the Y axis
+
  |  
 
  |-
 
  |-
  | Velocity Z
+
  | Pitch
  | Short
+
  | Angle
  | Velocity on the Z axis
+
  |  
 
  |}
 
  |}
  
==== Destroy Entities ====
+
When in {{Minecraft Wiki|Server.properties#online-mode|online mode}}, the UUIDs must be valid and have valid skin blobs.
 +
 
 +
In offline mode, [[Wikipedia:Universally unique identifier#Versions 3 and 5 (namespace name-based)|UUID v3]] is used with the String <code>OfflinePlayer:&lt;player name&gt;</code>, encoded in UTF-8 (and case-sensitive).
 +
 
 +
For NPCs UUID v2 should be used. Note:
 +
 
 +
<+Grum> i will never confirm this as a feature you know that :)
 +
 
 +
In an example UUID, <code>xxxxxxxx-xxxx-Yxxx-xxxx-xxxxxxxxxxxx</code>, the UUID version is specified by <code>Y</code>. So, for UUID v3, <code>Y</code> will always be <code>3</code>, and for UUID v2, <code>Y</code> will always be <code>2</code>.
 +
 
 +
==== Entity Animation (clientbound) ====
  
Sent by the server when a list of entities is to be destroyed on the client.
+
Sent whenever an entity should change animation.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 928: Line 994:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x13
+
  |rowspan="2"| 0x06
 
  |rowspan="2"| Play
 
  |rowspan="2"| Play
 
  |rowspan="2"| Client
 
  |rowspan="2"| Client
  | Count
+
  | Entity ID
 
  | VarInt
 
  | VarInt
  | Number of elements in the following array
+
  | Player ID
 
  |-
 
  |-
  | Entity IDs
+
  | Animation
  | Array of VarInt
+
  | Unsigned Byte
  | The list of entities of destroy
+
  | Animation ID (see below)
 
  |}
 
  |}
  
==== Entity ====
+
Animation can be one of the following values:
 
 
This packet may be used to initialize an entity.
 
 
 
For player entities, either this packet or any move/look packet is sent every game tick. So the meaning of this packet is basically that the entity did not move/look since the last such packet.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  ! ID
  ! State
+
  ! Animation
  ! Bound To
+
  |-
  ! Field Name
+
| 0
  ! Field Type
+
| Swing main arm
  ! Notes
+
|-
 +
| 1
 +
| Take damage
 +
|-
 +
| 2
 +
| Leave bed
 +
|-
 +
| 3
 +
| Swing offhand
 +
  |-
 +
  | 4
 +
  | Critical effect
 
  |-
 
  |-
  |rowspan="1"| 0x14
+
  | 5
|rowspan="1"| Play
+
  | Magic critical effect
|rowspan="1"| Client
 
| Entity ID
 
| VarInt
 
  |  
 
 
  |}
 
  |}
  
==== Entity Relative Move ====
+
==== Statistics ====
 
 
This packet is sent by the server when an entity moves less then 4 blocks; if an entity moves more than 4 blocks [[#Entity Teleport|Entity Teleport]] should be sent instead.
 
  
This packet allows at most four blocks movement in any direction, because byte range is from -128 to 127.
+
Sent as a response to [[#Client_Status|Client Status 0x04]] (id 1).
  
 
{| class="wikitable"
 
{| class="wikitable"
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
  ! Bound To
+
  ! Bound To  
  ! Field Name
+
  !colspan="2"| Field Name
  ! Field Type
+
  !colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="5"| 0x15
+
  |rowspan="4"| 0x07
  |rowspan="5"| Play
+
  |rowspan="4"| Play
  |rowspan="5"| Client
+
  |rowspan="4"| Client
  | Entity ID
+
  |colspan="2"| Count
 +
|colspan="2"| VarInt
 +
| Number of elements in the following array
 +
|-
 +
|rowspan="3"| Statistic
 +
| Category ID
 +
|rowspan="3"| Array
 
  | VarInt
 
  | VarInt
  |  
+
  | See below
 
  |-
 
  |-
  | Delta X
+
  | Statistic ID
  | Byte
+
  | VarInt
  | Change in X position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  | See below
 
  |-
 
  |-
  | Delta Y
+
  | Value
  | Byte
+
  | VarInt
| Change in Y position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  | The amount to set it to
|-
 
| Delta Z
 
| Byte
 
| Change in Z position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
 
|-
 
| On Ground
 
| Boolean
 
  |  
 
 
  |}
 
  |}
  
==== Entity Look ====
+
Categories (these are namespaced, but with <code>:</code> replaced with <code>.</code>):
 
 
This packet is sent by the server when an entity rotates.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  ! Name
! State
+
  ! ID
! Bound To
+
  ! Registry
! Field Name
 
  ! Field Type
 
  ! Notes
 
 
  |-
 
  |-
  |rowspan="5"| 0x16
+
  | <code>minecraft.mined</code>
|rowspan="5"| Play
+
  | 0
|rowspan="5"| Client
+
  | Blocks
| Entity ID
 
  | VarInt
 
  |  
 
 
  |-
 
  |-
  | Yaw
+
  | <code>minecraft.crafted</code>
  | Angle
+
  | 1
  | New angle, not a delta
+
  | Items
 +
|-
 +
| <code>minecraft.used</code>
 +
| 2
 +
| Items
 +
|-
 +
| <code>minecraft.broken</code>
 +
| 3
 +
| Items
 +
|-
 +
| <code>minecraft.picked_up</code>
 +
| 4
 +
| Items
 +
|-
 +
| <code>minecraft.dropped</code>
 +
| 5
 +
| Items
 +
|-
 +
| <code>minecraft.killed</code>
 +
| 6
 +
| Entities
 
  |-
 
  |-
  | Pitch
+
  | <code>minecraft.killed_by</code>
  | Angle
+
  | 7
  | New angle, not a delta
+
  | Entities
 
  |-
 
  |-
  | On Ground
+
  | <code>minecraft.custom</code>
  | Boolean
+
  | 8
  |  
+
  | Custom
 
  |}
 
  |}
  
==== Entity Look And Relative Move ====
+
Blocks, Items, and Entities use block (not block state), item, and entity ids.
  
This packet is sent by the server when an entity rotates and moves. Since a byte range is limited from -128 to 127, and movement is offset of fixed-point numbers, this packet allows at most four blocks movement in any direction. (-128/32 == -4)
+
Custom has the following (unit only matters for clients):
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  ! Name
! State
+
  ! ID
! Bound To
+
  ! Unit
! Field Name
 
  ! Field Type
 
  ! Notes
 
 
  |-
 
  |-
  |rowspan="7"| 0x17
+
  | <code>minecraft.leave_game</code>
|rowspan="7"| Play
+
  | 0
|rowspan="7"| Client
+
  | None
| Entity ID
 
  | VarInt
 
  |  
 
 
  |-
 
  |-
  | Delta X
+
  | <code>minecraft.play_one_minute</code>
  | Byte
+
  | 1
  | Change in X position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  | Time
 
  |-
 
  |-
  | Delta Y
+
  | <code>minecraft.time_since_death</code>
  | Byte
+
  | 2
  | Change in Y position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  | Time
 
  |-
 
  |-
  | Delta Z
+
  | <code>minecraft.sneak_Time</code>
  | Byte
+
  | 3
  | Change in Z position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  | Time
 
  |-
 
  |-
  | Yaw
+
  | <code>minecraft.walk_one_cm</code>
  | Angle
+
  | 4
  | New angle, not a delta
+
  | Distance
 
  |-
 
  |-
  | Pitch
+
  | <code>minecraft.crouch_one_cm</code>
  | Angle
+
  | 5
  | New angle, not a delta
+
  | Distance
 
  |-
 
  |-
  | On Ground
+
  | <code>minecraft.sprint_one_cm</code>
| Boolean
+
  | 6
  |  
+
  | Distance
  |}
 
 
 
==== Entity Teleport ====
 
 
 
This packet is sent by the server when an entity moves more than 4 blocks.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="7"| 0x18
+
  | <code>minecraft.swim_one_cm</code>
|rowspan="7"| Play
+
  | 7
  |rowspan="7"| Client
+
  | Distance
| Entity ID
 
| VarInt
 
  |  
 
 
  |-
 
  |-
  | X
+
  | <code>minecraft.fall_one_cm</code>
  | Int
+
  | 8
  | X position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  | Distance
 
  |-
 
  |-
  | Y
+
  | <code>minecraft.climb_one_cm</code>
  | Int
+
  | 9
  | Y position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  | Distance
 
  |-
 
  |-
  | Z
+
  | <code>minecraft.fly_one_cm</code>
  | Int
+
  | 10
  | Z position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  | Distance
 
  |-
 
  |-
  | Yaw
+
  | <code>minecraft.dive_one_cm</code>
  | Angle
+
  | 11
  | New angle, not a delta
+
  | Distance
 
  |-
 
  |-
  | Pitch
+
  | <code>minecraft.minecart_one_cm</code>
  | Angle
+
  | 12
  | New angle, not a delta
+
  | Distance
 +
|-
 +
| <code>minecraft.boat_one_cm</code>
 +
| 13
 +
| Distance
 
  |-
 
  |-
  | On Ground
+
  | <code>minecraft.pig_one_cm</code>
| Boolean
+
  | 14
  |  
+
  | Distance
  |}
 
 
 
==== Entity Head Look ====
 
 
 
Changes the direction an entity's head is facing.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="2"| 0x19
+
  | <code>minecraft.horse_one_cm</code>
|rowspan="2"| Play
+
  | 15
|rowspan="2"| Client
+
  | Distance
| Entity ID
 
  | VarInt
 
  |  
 
 
  |-
 
  |-
  | Head Yaw
+
  | <code>minecraft.aviate_one_cm</code>
  | Angle
+
  | 16
  | New angle, not a delta
+
  | Distance
|}
 
 
 
==== Entity Status ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="2"| 0x1A
+
  | <code>minecraft.jump</code>
|rowspan="2"| Play
+
  | 17
|rowspan="2"| Client
+
  | None
| Entity ID
 
  | Int
 
  |  
 
 
  |-
 
  |-
  | Entity Status
+
  | <code>minecraft.drop</code>
  | Byte
+
  | 18
  | See below
+
  | None
|}
 
 
 
{| class="wikitable"
 
 
  |-
 
  |-
  ! Entity Status
+
  | <code>minecraft.damage_dealt</code>
  ! Meaning
+
  | 19
 +
| Damage
 
  |-
 
  |-
  | 1
+
  | <code>minecraft.damage_taken</code>
  | Sent when resetting a mob spawn minecart's timer - appears to be unused by the client
+
  | 20
 +
| Damage
 
  |-
 
  |-
  | 2
+
  | <code>minecraft.deaths</code>
  | Living Entity hurt
+
  | 21
 +
| None
 
  |-
 
  |-
  | 3
+
  | <code>minecraft.mob_kills</code>
  | Living Entity dead
+
  | 22
 +
| None
 
  |-
 
  |-
  | 4
+
  | <code>minecraft.animals_bred</code>
  | Iron Golem throwing up arms
+
  | 23
 +
| None
 
  |-
 
  |-
  | 6
+
  | <code>minecraft.player_kills</code>
  | Wolf/Ocelot/Horse taming — Spawn “heart” particles
+
| 24
 +
  | None
 
  |-
 
  |-
  | 7
+
  | <code>minecraft.fish_caught</code>
  | Wolf/Ocelot/Horse tamed — Spawn “smoke” particles
+
| 25
 +
  | None
 
  |-
 
  |-
  | 8
+
  | <code>minecraft.talked_to_villager</code>
  | Wolf shaking water — Trigger the shaking animation
+
  | 26
 +
| None
 
  |-
 
  |-
  | 9
+
  | <code>minecraft.traded_with_villager</code>
  | (of self) Eating accepted by server
+
  | 27
 +
| None
 
  |-
 
  |-
  | 10
+
  | <code>minecraft.eat_cake_slice</code>
  | Sheep eating grass
+
  | 28
 +
| None
 
  |-
 
  |-
  | 10
+
  | <code>minecraft.fill_cauldron</code>
  | Play TNT ignite sound
+
  | 29
 +
| None
 
  |-
 
  |-
  | 11
+
  | <code>minecraft.use_cauldron</code>
  | Iron Golem handing over a rose
+
  | 30
 +
| None
 
  |-
 
  |-
  | 12
+
  | <code>minecraft.clean_armor</code>
  | Villager mating — Spawn “heart” particles
+
  | 31
 +
| None
 
  |-
 
  |-
  | 13
+
  | <code>minecraft.clean_banner</code>
  | Spawn particles indicating that a villager is angry and seeking revenge
+
  | 32
 +
| None
 
  |-
 
  |-
  | 14
+
  | <code>minecraft.interact_with_brewingstand</code>
  | Spawn happy particles near a villager
+
  | 33
 +
| None
 
  |-
 
  |-
  | 15
+
  | <code>minecraft.interact_with_beacon</code>
  | Witch animation — Spawn “magic” particles
+
  | 34
 +
| None
 
  |-
 
  |-
  | 16
+
  | <code>minecraft.inspect_dropper</code>
  | Play zombie converting into a villager sound
+
  | 35
 +
| None
 
  |-
 
  |-
  | 17
+
  | <code>minecraft.inspect_hopper</code>
  | Firework exploding
+
  | 36
 +
| None
 +
|-
 +
| <code>minecraft.inspect_dispenser</code>
 +
| 37
 +
| None
 +
|-
 +
| <code>minecraft.play_noteblock</code>
 +
| 38
 +
| None
 +
|-
 +
| <code>minecraft.tune_noteblock</code>
 +
| 39
 +
| None
 +
|-
 +
| <code>minecraft.pot_flower</code>
 +
| 40
 +
| None
 +
|-
 +
| <code>minecraft.trigger_trapped_chest</code>
 +
| 41
 +
| None
 +
|-
 +
| <code>minecraft.open_enderchest</code>
 +
| 42
 +
| None
 +
|-
 +
| <code>minecraft.enchant_item</code>
 +
| 43
 +
| None
 
  |-
 
  |-
  | 18
+
  | <code>minecraft.play_record</code>
  | Animal in love (ready to mate) — Spawn “heart” particles
+
  | 44
 +
| None
 
  |-
 
  |-
  | 19
+
  | <code>minecraft.interact_with_furnace</code>
  | Reset squid rotation
+
  | 45
 +
| None
 
  |-
 
  |-
  | 20
+
  | <code>minecraft.interact_with_crafting_table</code>
  | Spawn explosion particle — works for some living entities
+
  | 46
 +
| None
 
  |-
 
  |-
  | 21
+
  | <code>minecraft.open_chest</code>
  | Play guardian sound — works for every entity
+
  | 47
 +
| None
 
  |-
 
  |-
  | 22
+
  | <code>minecraft.sleep_in_bed</code>
  | Enables reduced debug for players
+
  | 48
 +
| None
 
  |-
 
  |-
  | 23
+
  | <code>minecraft.open_shulker_box</code>
  | Disables reduced debug for players
+
  | 49
 +
| None
 
  |}
 
  |}
  
==== Attach Entity ====
+
Units:
 +
 
 +
* None: just a normal number (formatted with 0 decimal places)
 +
* Damage: value is 10 times the normal amount
 +
* Distance: a distance in centimeters (hundredths of blocks)
 +
* Time: a time span in ticks
  
This packet is sent when a player has been attached to an entity (e.g. Minecart).
+
==== Acknowledge Player Digging ====
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,253: Line 1,336:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x1B
+
  |rowspan="4"| 0x08
  |rowspan="3"| Play
+
  |rowspan="4"| Play
  |rowspan="3"| Client
+
  |rowspan="4"| Client
  | Entity ID
+
  | Location
  | Int
+
| Position
  | Attached entity's EID. Set to -1 to detach.
+
  | Position where the digging was happening
 +
  |-
 +
| Block
 +
| VarInt
 +
| Block state ID of the block that should be at that position now.
 
  |-
 
  |-
  | Vehicle ID
+
  | Status
  | Int
+
  | VarInt enum
  | Vechicle's Entity ID
+
  | Same as Player Digging.  Only Started digging (0), Cancelled digging (1), and Finished digging (2) are used.
 
  |-
 
  |-
  | Leash
+
  | Successful
 
  | Boolean
 
  | Boolean
  | If true leashes the entity to the vehicle
+
  | True if the digging succeeded; false if the client should undo any changes it made locally.  (How does this work?)
 
  |}
 
  |}
  
==== Entity Metadata ====
+
==== Block Break Animation ====
 +
 
 +
0–9 are the displayable destroy stages and each other number means that there is no animation on this coordinate.
 +
 
 +
Block break animations can still be applied on air; the animation will remain visible although there is no block being broken.  However, if this is applied to a transparent block, odd graphical effects may happen, including water losing its transparency.  (An effect similar to this can be seen in normal gameplay when breaking ice blocks)
 +
 
 +
If you need to display several break animations at the same time you have to give each of them a unique Entity ID. The entity ID does not need to correspond to an actual entity on the client. It is valid to use a randomly generated number.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,279: Line 1,372:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x1C
+
  |rowspan="3"| 0x09
  |rowspan="2"| Play
+
  |rowspan="3"| Play
  |rowspan="2"| Client
+
  |rowspan="3"| Client
 
  | Entity ID
 
  | Entity ID
 
  | VarInt
 
  | VarInt
  |  
+
  | Entity ID of the entity breaking the block
 +
|-
 +
| Location
 +
| Position
 +
| Block Position
 
  |-
 
  |-
  | Metadata
+
  | Destroy Stage
  | [[Entities#Entity Metadata Format|Metadata]]
+
  | Byte
  |  
+
  | 0–9 to set it, any other value to remove it
 
  |}
 
  |}
  
==== Entity Effect ====
+
==== Block Entity Data ====
 +
 
 +
Sets the block entity associated with the block at the given location.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,301: Line 1,400:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="5"| 0x1D
+
  |rowspan="3"| 0x0A
  |rowspan="5"| Play
+
  |rowspan="3"| Play
  |rowspan="5"| Client
+
  |rowspan="3"| Client
  | Entity ID
+
  | Location
  | VarInt
+
  | Position
 
  |  
 
  |  
 
  |-
 
  |-
  | Effect ID
+
  | Action
  | Byte
+
  | Unsigned Byte
  | See {{Minecraft Wiki|Status effect#List of effects|this table}}
+
  | The type of update to perform, see below
 
  |-
 
  |-
  | Amplifier
+
  | NBT Data
  | Byte
+
  | [[NBT|NBT Tag]]
| Notchian client displays effect level as Amplifier + 1
+
  | Data to set. May be a TAG_END (0), in which case the block entity at the given location is removed (though this is not required since the client will remove the block entity automatically on chunk unload or block removal)
  |-
 
  | Duration
 
| VarInt
 
| Seconds
 
|-
 
| Hide Particles
 
| Boolean
 
|
 
 
  |}
 
  |}
  
==== Remove Entity Effect ====
+
''Action'' field:
  
{| class="wikitable"
+
* '''1''': Set data of a mob spawner (everything except for SpawnPotentials: current delay, min/max delay, mob to be spawned, spawn count, spawn range, etc.)
  ! Packet ID
+
* '''2''': Set command block text (command and last execution status)
 +
* '''3''': Set the level, primary, and secondary powers of a beacon
 +
* '''4''': Set rotation and skin of mob head
 +
* '''5''': Declare a conduit
 +
* '''6''': Set base color and patterns on a banner
 +
* '''7''': Set the data for a Structure tile entity
 +
* '''8''': Set the destination for a end gateway
 +
* '''9''': Set the text on a sign
 +
* '''10''': Unused
 +
* '''11''': Declare a bed
 +
* '''12''': Set data of a jigsaw block
 +
* '''13''': Set items in a campfire
 +
* '''14''': Behive information
 +
 
 +
==== Block Action ====
 +
 
 +
This packet is used for a number of actions and animations performed by blocks, usually non-persistent.
 +
 
 +
See [[Block Actions]] for a list of values.
 +
 
 +
{{Warning2|This packet uses a block ID, not a block state.  Unfortunately, block IDs are not directly included in the output from [[Data Generators]], but can manually be calculated.}}
 +
 
 +
{| class="wikitable"
 +
  ! Packet ID
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
Line 1,335: Line 1,449:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x1E
+
  |rowspan="4"| 0x0B
  |rowspan="2"| Play
+
  |rowspan="4"| Play
  |rowspan="2"| Client
+
  |rowspan="4"| Client
  | Entity ID
+
  | Location
 +
| Position
 +
| Block coordinates
 +
|-
 +
| Action ID (Byte 1)
 +
| Unsigned Byte
 +
| Varies depending on block — see [[Block Actions]]
 +
|-
 +
| Action Param (Byte 2)
 +
| Unsigned Byte
 +
| Varies depending on block — see [[Block Actions]]
 +
|-
 +
| Block Type
 
  | VarInt
 
  | VarInt
  |  
+
  | The block type ID for the block. This must match the block at the given coordinates.
|-
 
| Effect ID
 
| Byte
 
  | See {{Minecraft Wiki|Status effect#List of effects|this table}}
 
 
  |}
 
  |}
  
==== Set Experience ====
+
==== Block Change ====
 +
 
 +
Fired whenever a block is changed within the render distance.
  
Sent by the server when the client should change experience levels.
+
{{Warning2|Changing a block in a chunk that is not loaded is not a stable action.  The Notchian client currently uses a ''shared'' empty chunk which is modified for all block changes in unloaded chunks; while in 1.9 this chunk never renders in older versions the changed block will appear in all copies of the empty chunk.  Servers should avoid sending block changes in unloaded chunks and clients should ignore such packets.}}
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,359: Line 1,483:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x1F
+
  |rowspan="2"| 0x0C
  |rowspan="3"| Play
+
  |rowspan="2"| Play
  |rowspan="3"| Client
+
  |rowspan="2"| Client
  | Experience bar
+
  | Location
  | Float
+
  | Position
  | Between 0 and 1
+
  | Block Coordinates
 
  |-
 
  |-
  | Level
+
  | Block ID
| VarInt
 
|
 
|-
 
| Total Experience
 
 
  | VarInt
 
  | VarInt
  | See {{Minecraft Wiki|Experience#Leveling up}} on the Minecraft Wiki for Total Experience to Level conversion
+
  | The new block state ID for the block as given in the {{Minecraft Wiki|Data values#Block IDs|global palette}}. See that section for more information.
 
  |}
 
  |}
  
==== Entity Properties ====
+
==== Boss Bar ====  
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,382: Line 1,502:
 
  ! Bound To
 
  ! Bound To
 
  !colspan="2"| Field Name
 
  !colspan="2"| Field Name
  !colspan="2"| Field Type
+
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="6"| 0x20
+
  |rowspan="14"| 0x0D
  |rowspan="6"| Play
+
  |rowspan="14"| Play
  |rowspan="6"| Client
+
  |rowspan="14"| Client
  |colspan="2"| Entity ID
+
  |colspan="2"| UUID
  |colspan="2"| VarInt
+
| UUID
 +
| Unique ID for this bar
 +
|-
 +
  |colspan="2"| Action
 +
| VarInt Enum
 +
| Determines the layout of the remaining packet
 +
|-
 +
! Action
 +
! Field Name
 +
!
 +
!
 +
|-
 +
|rowspan="5"| 0: add
 +
| Title
 +
| [[Chat]]
 
  |  
 
  |  
 
  |-
 
  |-
  |colspan="2"| Number Of Properties
+
  | Health
  |colspan="2"| Int
+
  | Float
  | Number of elements in the following array
+
  | From 0 to 1. Values greater than 1 do not crash a Notchian client, and start [https://i.johni0702.de/nA.png rendering part of a second health bar] at around 1.5.
 
  |-
 
  |-
  |rowspan="4"| Property
+
  | Color
| Key
+
  | VarInt Enum
|rowspan="4"| Array
+
  | Color ID (see below)
  | String
 
  | See below
 
 
  |-
 
  |-
  | Value
+
  | Division
  | Double
+
  | VarInt Enum
  | See below
+
  | Type of division (see below)
 
  |-
 
  |-
  | Number Of Modifiers
+
  | Flags
  | VarInt
+
| Unsigned Byte
  | Number of elements in the following array
+
| Bit mask. 0x1: should darken sky, 0x2: is dragon bar (used to play end music), 0x04: create fog (previously was also controlled by 0x02)
 +
|-
 +
| 1: remove
 +
| ''no fields''
 +
| ''no fields''
 +
| Removes this boss bar
 +
|-
 +
| 2: update health
 +
| Health
 +
| Float
 +
| as above
 +
|-
 +
| 3: update title
 +
| Title
 +
| [[Chat]]
 +
|
 +
|-
 +
|rowspan="2"| 4: update style
 +
| Color
 +
| VarInt Enum
 +
| Color ID (see below)
 +
|-
 +
| Dividers
 +
  | VarInt Enum
 +
| as above
 +
|-
 +
| 5: update flags
 +
| Flags
 +
| Unsigned Byte
 +
  | as above
 
  |-
 
  |-
| Modifiers
 
| Array of Modifier Data
 
| See {{Minecraft Wiki|Attribute#Modifiers}}
 
 
  |}
 
  |}
 
Known Key values:
 
  
 
{| class="wikitable"
 
{| class="wikitable"
 +
! ID
 +
! Color
 
  |-
 
  |-
  ! Key
+
  | 0
  ! Default
+
  | Pink
! Min
 
! Max
 
! Label
 
 
  |-
 
  |-
  | generic.maxHealth
+
  | 1
  | 20.0
+
  | Blue
| 0.0
 
| Double.MaxValue
 
| Max Health
 
 
  |-
 
  |-
  | generic.followRange
+
  | 2
  | 32.0
+
  | Red
| 0.0
 
| 2048.0
 
| Follow Range
 
 
  |-
 
  |-
  | generic.knockbackResistance
+
  | 3
  | 0.0
+
  | Green
| 0.0
 
| 1.0
 
| Knockback Resistance
 
 
  |-
 
  |-
  | generic.movementSpeed
+
  | 4
  | 0.699999988079071
+
  | Yellow
| 0.0
 
| Double.MaxValue
 
| Movement Speed
 
 
  |-
 
  |-
  | generic.attackDamage
+
  | 5
| 2.0
+
  | Purple
| 0.0
 
| Double.MaxValue
 
  |  
 
 
  |-
 
  |-
  | horse.jumpStrength
+
  | 6
  | 0.7
+
  | White
| 0.0
 
| 2.0
 
| Jump Strength
 
|-
 
| zombie.spawnReinforcements
 
| 0.0
 
| 0.0
 
| 1.0
 
| Spawn Reinforcements Chance
 
 
  |}
 
  |}
 
''Modifier Data'' structure:
 
  
 
{| class="wikitable"
 
{| class="wikitable"
 +
! ID
 +
! Type of division
 
  |-
 
  |-
  ! Field Name
+
  | 0
  ! Field Type
+
  | No division
  ! Notes
+
  |-
 +
| 1
 +
| 6 notches
 
  |-
 
  |-
  | UUID
+
  | 2
| UUID
+
  | 10 notches
  |  
 
 
  |-
 
  |-
  | Amount
+
  | 3
| Double
+
  | 12 notches
  |  
 
 
  |-
 
  |-
  | Operation
+
  | 4
| Byte
+
  | 20 notches
  |  
 
 
  |}
 
  |}
  
==== Chunk Data ====
+
==== Server Difficulty ====
  
Chunks are not unloaded by the client automatically. To unload chunks, send this packet with Ground-Up Continuous=true and no 16^3 chunks (eg. Primary Bit Mask=0). The server does not send skylight information for nether-chunks, it's up to the client to know if the player is currently in the nether. You can also infer this information from the primary bitmask and the amount of uncompressed bytes sent.
+
Changes the difficulty setting in the client's option menu
  
See also: [[SMP Map Format]]
+
{| class="wikitable"
 
 
Changes in 1.8:
 
 
 
* Data value section removed
 
* Extended id section removed
 
* Block id section is now a unsigned short (little endian) per a block
 
* The block id is equal to <code>(id << 4) | data</code>
 
 
 
{| class="wikitable"
 
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
Line 1,510: Line 1,631:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="6"| 0x21
+
  |rowspan="2"| 0x0E
  |rowspan="6"| Play
+
  |rowspan="2"| Play
  |rowspan="6"| Client
+
  |rowspan="2"| Client
  | Chunk X
+
  | Difficulty
  | Int
+
  | Unsigned Byte
  | Chunk X coordinate
+
  | 0: peaceful, 1: easy, 2: normal, 3: hard
|-
 
| Chunk Z
 
| Int
 
| Chunk Z coordinate
 
 
  |-
 
  |-
  | Ground-Up Continuous
+
  | Difficulty locked?
 
  | Boolean
 
  | Boolean
| This is true if the packet represents all sections in this vertical column, where the Primary Bit Mask specifies exactly which sections are included, and which are air
+
  |
|-
 
| Primary Bit Mask
 
| Unsigned Short
 
| Bitmask with 1 for every 16x16x16 section whose data follows in the compressed data
 
|-
 
| Size
 
| VarInt
 
| Size of Data
 
|-
 
| Data
 
| [[SMP Map Format#Data|Chunk]]
 
  |  
 
 
  |}
 
  |}
  
==== Multi Block Change ====
+
==== Chat Message (clientbound) ====  
Fired whenever 2 or more blocks are changed within the render distance.
+
 
 +
Identifying the difference between Chat/System Message is important as it helps respect the user's chat visibility options.  See [[Chat#Processing chat|processing chat]] for more info about these positions.
 +
 
 +
{{warning2|Game info accepts json formatting but does not display it, although the deprecated §-based formatting works.  This is not an issue when using the [[#Title|Title]] packet, so prefer that packet for displaying information in that slot.  See [https://bugs.mojang.com/browse/MC-119145 MC-119145] for more information.}}
 +
 
 
{| class="wikitable"
 
{| class="wikitable"
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="2"| Field Name
+
  ! Field Name
  !colspan="2"| Field Type
+
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="6"| 0x22
+
|rowspan="2"| 0x0F
  |rowspan="6"| Play
+
|rowspan="2"| Play
  |rowspan="6"| Client
+
|rowspan="2"| Client
  |colspan="2"| Chunk X
+
| JSON Data
  |colspan="2"| Int
+
| [[Chat]]
  | Chunk X coordinate
+
| Limited to 32767 bytes
 +
|-
 +
| Position
 +
| Byte
 +
| 0: chat (chat box), 1: system message (chat box), 2: game info (above hotbar).
 +
|}
 +
 
 +
==== Multi Block Change ====
 +
 
 +
Fired whenever 2 or more blocks are changed within the same chunk on the same tick.
 +
 
 +
{{Warning|Changing blocks in chunks not loaded by the client is unsafe (see note on [[#Block Change|Block Change]]).}}
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
!colspan="2"| Field Name
 +
!colspan="2"| Field Type
 +
! Notes
 +
|-
 +
  |rowspan="6"| 0x10
 +
  |rowspan="6"| Play
 +
  |rowspan="6"| Client
 +
  |colspan="2"| Chunk X
 +
  |colspan="2"| Int
 +
  | Chunk X coordinate
 
  |-
 
  |-
 
  |colspan="2"| Chunk Z
 
  |colspan="2"| Chunk Z
Line 1,561: Line 1,696:
 
  |colspan="2"| Record Count
 
  |colspan="2"| Record Count
 
  |colspan="2"| VarInt
 
  |colspan="2"| VarInt
  | Number of elements in the following array, a.k.a. the number of blocks affected
+
  | Number of elements in the following array, i.e. the number of blocks affected
 
  |-
 
  |-
 
  |rowspan="3"| Record
 
  |rowspan="3"| Record
Line 1,571: Line 1,706:
 
  | Y Coordinate
 
  | Y Coordinate
 
  | Unsigned Byte
 
  | Unsigned Byte
  |  
+
  | Y coordinate of the block
 
  |-
 
  |-
 
  | Block ID
 
  | Block ID
 
  | VarInt
 
  | VarInt
  | The new block ID for the block. <code><nowiki>id &lt;&lt; 4 | data</nowiki></code>
+
  | The new block state ID for the block as given in the {{Minecraft Wiki|Data values#Block IDs|global palette}}. See that section for more information.
 
  |}
 
  |}
  
==== Block Change ====
+
To decode the position into a world position:
Fired whenever a block is changed within the render distance.
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="2"| 0x23
 
|rowspan="2"| Play
 
|rowspan="2"| Client
 
| Location
 
| Position
 
| Block Coordinates
 
|-
 
| Block ID
 
| VarInt
 
| The new block ID for the block. <code><nowiki>id &lt;&lt; 4 | data</nowiki></code>
 
|}
 
  
==== Block Action ====
+
<syntaxhighlight lang="java">
 +
worldX = (horizPos >> 4 & 15) + (chunkX * 16);
 +
worldY = vertPos;
 +
worldZ = (horizPos & 15) + (chunkZ * 16);
 +
</syntaxhighlight>
  
This packet is used for a number of things:
+
==== Tab-Complete (clientbound) ====
  
* Chests opening and closing
+
The server responds with a list of auto-completions of the last word sent to it. In the case of regular chat, this is a player username. Command names and parameters are also supported. The client sorts these alphabetically before listing them.
* Pistons pushing and pulling
 
* Note blocks playing
 
* Updating beacons
 
 
 
See Also: [[Block Actions]]
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,615: Line 1,729:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
  ! Field Type
+
  !colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="4"| 0x24
+
  |rowspan="8"| 0x11
  |rowspan="4"| Play
+
  |rowspan="8"| Play
  |rowspan="4"| Client
+
  |rowspan="8"| Client
  | Location
+
  |-
  | Position
+
  |colspan="2"| ID
  | Block Coordinates
+
|colspan="2"| VarInt
 +
| Transaction ID
 +
|-
 +
|colspan="2"| Start
 +
|colspan="2"| VarInt
 +
| Start of the text to replace
 +
|-
 +
|colspan="2"| Length
 +
|colspan="2"| VarInt
 +
| Length of the text to replace
 +
|-
 +
|colspan="2"| Count
 +
|colspan="2"| VarInt
 +
  | Number of elements in the following array
 
  |-
 
  |-
  | Byte 1
+
  |rowspan="3"| Matches
  | Unsigned Byte
+
  | Match
  | Varies depending on block — see [[Block Actions]]
+
  |rowspan="3"| Array
 +
| String (32767)
 +
| One eligible value to insert, note that each command is sent separately instead of in a single string, hence the need for Count.  Note that for instance this doesn't include a leading <code>/</code> on commands.
 
  |-
 
  |-
  | Byte 2
+
  | Has tooltip
  | Unsigned Byte
+
  | Boolean
  | Varies depending on block — see [[Block Actions]]
+
  | True if the following is present
 
  |-
 
  |-
  | Block Type
+
  | Tooltip
  | VarInt
+
  | Optional [[Chat]]
  | The block type for the block
+
  | Tooltip to display; only present if previous boolean is true
 
  |}
 
  |}
  
==== Block Break Animation ====
+
==== Declare Commands ====
  
0–9 are the displayable destroy stages and each other number means that there is no animation on this coordinate.
+
Lists all of the commands on the server, and how they are parsed.
  
You can also set an animation to air! The animation will still be visible.
+
This is a directed graph, with one root node. Each redirect or child node must refer only to nodes that have already been declared.
 
 
If you need to display several break animations at the same time you have to give each of them a unique Entity ID.
 
 
 
Also if you set the coordinates to a special block like water etc. it won't show the actual break animation but some other interesting effects. (Water will lose it's transparency)
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,657: Line 1,782:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x25
+
  |rowspan="3"| 0x12
 
  |rowspan="3"| Play
 
  |rowspan="3"| Play
 
  |rowspan="3"| Client
 
  |rowspan="3"| Client
  | Entity ID
+
  | Count
 
  | VarInt
 
  | VarInt
  | EID for the animation
+
  | Number of elements in the following array
 
  |-
 
  |-
  | Location
+
  | Nodes
  | Position
+
  | Array of [[Command Data|Node]]
  | Block Position
+
  | An array of nodes
 
  |-
 
  |-
  | Destroy Stage
+
  | Root index
  | Byte
+
  | VarInt
  | 0–9 to set it, any other value to remove it
+
  | Index of the <code>root</code> node in the previous array
 
  |}
 
  |}
  
==== Map Chunk Bulk ====
+
For more information on this packet, see the [[Command Data]] article.
  
1.8 changes at [[#Chunk Data|Chunk Data]]
+
==== Window Confirmation (clientbound) ====
  
To reduce the number of bytes, this packet is used to send chunks together for better compression results.
+
A packet from the server indicating whether a request from the client was accepted, or whether there was a conflict (due to lag).  If the packet was not accepted, the client must respond with a [[#Window Confirmation (serverbound)|serverbound window confirmation]] packet.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,683: Line 1,808:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="2"| Field Name
+
  ! Field Name
  !colspan="2"| Field Type
+
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="7"| 0x26
+
  |rowspan="3"| 0x13
  |rowspan="7"| Play
+
  |rowspan="3"| Play
  |rowspan="7"| Client
+
  |rowspan="3"| Client
  |colspan="2"| Sky Light Sent
+
  | Window ID
  |colspan="2"| Boolean
+
  | Byte
  | Whether or not Chunk Data contains light nibble arrays. This is true in the Overworld, false in the End + Nether
+
  | The ID of the window that the action occurred in
 
  |-
 
  |-
  |colspan="2"| Chunk Column Count
+
  | Action Number
  |colspan="2"| VarInt
+
  | Short
  | Number of elements in each of the following arrays
+
  | Every action that is to be accepted has a unique number. This number is an incrementing integer (starting at 0) with separate counts for each window ID.
 
  |-
 
  |-
  |rowspan="3"| Chunk Meta
+
  | Accepted
| Chunk X
+
  | Boolean
|rowspan="3"| Array
+
  | Whether the action was accepted
| Int
 
| The X coordinate of the chunk
 
|-
 
| Chunk Z
 
| Int
 
| The Z coordinate of the chunk
 
  |-
 
  | Primary Bit Mask
 
| Unsigned Short
 
| A bit mask which specifies which sections are not empty in this chunk
 
|-
 
|colspan="2"| Chunk Data
 
|colspan="2"| Array of [[SMP Map Format#Data|Chunk]]
 
| Each chunk in this array corresponds to the data at the same position in Chunk Meta
 
 
  |}
 
  |}
  
==== Explosion ====
+
==== Close Window (clientbound) ====
  
Sent when an explosion occurs (creepers, TNT, and ghast fireballs).
+
This packet is sent from the server to the client when a window is forcibly closed, such as when a chest is destroyed while it's open.
 
 
Each block in Records is set to air. Coordinates for each axis in record is int(X) + record.x
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,731: Line 1,840:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="9"| 0x27
+
  | 0x14
  |rowspan="9"| Play
+
  | Play
  |rowspan="9"| Client
+
  | Client
  | X
+
  | Window ID
| Float
+
  | Unsigned Byte
|
+
  | This is the ID of the window that was closed. 0 for inventory.
|-
+
  |}
| Y
+
 
| Float
+
==== Window Items ====
|
+
[[File:Inventory-slots.png|thumb|The inventory slots]]
|-
+
 
| Z
+
Sent by the server when items in multiple slots (in a window) are added/removed. This includes the main inventory, equipped armour and crafting slots.
| Float
 
|
 
|-
 
| Radius
 
| Float
 
| Currently unused in the client
 
|-
 
  | Record Count
 
| Int
 
| Number of elements in the following array
 
|-
 
| Records
 
| Array of (Byte, Byte, Byte)
 
  | Each record is 3 signed bytes long, each bytes are the XYZ (respectively) offsets of affected blocks.
 
|-
 
| Player Motion X
 
| Float
 
| X velocity of the player being pushed by the explosion
 
|-
 
| Player Motion Y
 
| Float
 
| Y velocity of the player being pushed by the explosion
 
|-
 
| Player Motion Z
 
| Float
 
| Z velocity of the player being pushed by the explosion
 
  |}
 
 
 
==== Effect ====
 
 
 
Sent when a client is to play a sound or particle effect.
 
 
 
By default, the Minecraft client adjusts the volume of sound effects based on distance. The final boolean field is used to disable this, and instead the effect is played from 2 blocks away in the correct direction. Currently this is only used for effect 1013 (mob.wither.spawn), and is ignored for any other value by the client.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,785: Line 1,861:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="4"| 0x28
+
  |rowspan="3"| 0x15
  |rowspan="4"| Play
+
  |rowspan="3"| Play
  |rowspan="4"| Client
+
  |rowspan="3"| Client
  | Effect ID
+
  | Window ID
  | Int
+
  | Unsigned Byte
  | The ID of the effect, see below
+
  | The ID of window which items are being sent for. 0 for player inventory.
 
  |-
 
  |-
  | Location
+
  | Count
  | Position
+
  | Short
  | The location of the effect
+
  | Number of elements in the following array
 
  |-
 
  |-
  | Data
+
  | Slot Data
  | Int
+
  | Array of [[Slot Data|Slot]]
| Extra data for certain effects, see below
+
  |  
|-
 
| Disable Relative Volume
 
| Boolean
 
  | See above
 
 
  |}
 
  |}
  
Effect IDs:
+
See [[Inventory#Windows|inventory windows]] for further information about how slots are indexed.
 +
 
 +
==== Window Property ====
 +
 
 +
This packet is used to inform the client that part of a GUI window should be updated.
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! ID
+
  ! Packet ID
  ! Name
+
  ! State
  ! Data
+
! Bound To
 +
! Field Name
 +
  ! Field Type
 +
! Notes
 
  |-
 
  |-
  !colspan="3"| Sound
+
  |rowspan="3"| 0x16
  |-
+
|rowspan="3"| Play
  | 1000
+
  |rowspan="3"| Client
  | <code>random.click</code>
+
  | Window ID
 +
  | Unsigned Byte
 
  |  
 
  |  
 
  |-
 
  |-
  | 1001
+
  | Property
  | <code>random.click</code>
+
  | Short
  |  
+
  | The property to be updated, see below
 
  |-
 
  |-
  | 1002
+
  | Value
  | <code>random.bow</code>
+
  | Short
|  
+
| The new value for the property, see below
 +
|}
 +
 
 +
The meaning of the Property field depends on the type of the window. The following table shows the known combinations of window type and property, and how the value is to be interpreted.
 +
 
 +
{| class="wikitable"
 
  |-
 
  |-
  | 1003
+
  ! Window type
  | <code>random.door_open</code> or <code>random.door_close</code> (50/50 chance)
+
  ! Property
  |
+
  ! Value
 
  |-
 
  |-
  | 1004
+
  |rowspan="4"| Furnace
  | <code>random.fizz</code>
+
  | 0: Fire icon (fuel left)
  |  
+
  | counting from fuel burn time down to 0 (in-game ticks)
 
  |-
 
  |-
  | 1005
+
  | 1: Maximum fuel burn time
  | Play a music disc.
+
  | fuel burn time or 0 (in-game ticks)
| {{Minecraft Wiki|Music Discs|Record ID}}
 
 
  |-
 
  |-
  | 1006
+
  | 2: Progress arrow
| ''not assigned''
+
  | counting from 0 to maximum progress (in-game ticks)
  |  
 
 
  |-
 
  |-
  | 1007
+
  | 3: Maximum progress
| <code>mob.ghast.charge</code>
+
  | always 200 on the notchian server
  |  
 
 
  |-
 
  |-
  | 1008
+
  |rowspan="10"| Enchantment Table
  | <code>mob.ghast.fireball</code>
+
  | 0: Level requirement for top enchantment slot
  |  
+
  |rowspan="3"| The enchantment's xp level requirement
 
  |-
 
  |-
  | 1009
+
  | 1: Level requirement for middle enchantment slot
| <code>mob.ghast.fireball</code>, but with a lower volume
 
|
 
 
  |-
 
  |-
  | 1010
+
  | 2: Level requirement for bottom enchantment slot
| <code>mob.zombie.wood</code>
 
|
 
 
  |-
 
  |-
  | 1011
+
  | 3: The enchantment seed
  | <code>mob.zombie.metal</code>
+
  | Used for drawing the enchantment names (in [[Wikipedia:Standard Galactic Alphabet|SGA]]) clientside.  The same seed ''is'' used to calculate enchantments, but some of the data isn't sent to the client to prevent easily guessing the entire list (the seed value here is the regular seed bitwise and <code>0xFFFFFFF0</code>).
|
 
 
  |-
 
  |-
  | 1012
+
  | 4: Enchantment ID shown on mouse hover over top enchantment slot
  | <code>mob.zombie.woodbreak</code>
+
  |rowspan="3"| The enchantment id (set to -1 to hide it), see below for values
|  
 
 
  |-
 
  |-
  | 1013
+
  | 5: Enchantment ID shown on mouse hover over middle enchantment slot
| <code>mob.wither.spawn</code>
 
|
 
 
  |-
 
  |-
  | 1014
+
  | 6: Enchantment ID shown on mouse hover over bottom enchantment slot
| <code>mob.wither.shoot</code>
 
|
 
 
  |-
 
  |-
  | 1015
+
  | 7: Enchantment level shown on mouse hover over the top slot
  | <code>mob.bat.takeoff</code>
+
  |rowspan="3"| The enchantment level (1 = I, 2 = II, 6 = VI, etc.), or -1 if no enchant
|
 
 
  |-
 
  |-
  | 1016
+
  | 8: Enchantment level shown on mouse hover over the middle slot
| <code>mob.zombie.infect</code>
 
|
 
 
  |-
 
  |-
  | 1017
+
  | 9: Enchantment level shown on mouse hover over the bottom slot
| <code>mob.zombie.unfect</code>
 
|
 
 
  |-
 
  |-
  | 1018
+
  |rowspan="3"| Beacon
  | <code>mob.enderdragon.end</code>
+
  | 0: Power level
  |  
+
  | 0-4, controls what effect buttons are enabled
 
  |-
 
  |-
  | 1020
+
  | 1: First potion effect
  | <code>random.anvil_break</code>
+
  | {{Minecraft Wiki|Data values#Status effects|Potion effect ID}} for the first effect, or -1 if no effect
|  
 
 
  |-
 
  |-
  | 1021
+
  | 2: Second potion effect
  | <code>random.anvil_use</code>
+
  | {{Minecraft Wiki|Data values#Status effects|Potion effect ID}} for the second effect, or -1 if no effect
|  
 
 
  |-
 
  |-
  | 1022
+
  | Anvil
  | <code>random.anvil_land</code>
+
  | 0: Repair cost
  |  
+
  | The repair's cost in xp levels
 
  |-
 
  |-
  !colspan="3"| Particle
+
  |rowspan="2"| Brewing Stand
 +
| 0: Brew time
 +
| 0 – 400, with 400 making the arrow empty, and 0 making the arrow full
 
  |-
 
  |-
  | 2000
+
  | 1: Fuel time
  | Spawns 10 smoke particles, e.g. from a fire
+
  | 0 - 20, with 0 making the arrow empty, and 20 making the arrow full
| Direction, see below
 
 
  |-
 
  |-
  | 2001
+
  | Stonecutter
  | Block break
+
  | 0: Selected recipe
  | {{Minecraft Wiki|Data values|Block ID}}
+
  | The index of the selected recipe. -1 means none is selected.
 
  |-
 
  |-
  | 2002
+
  | Loom
  | Splash potion. Particle effect + glass break sound.
+
  | 0: Selected pattern
| [http://www.lb-stuff.com/Minecraft/PotionDataValues1.9pre3.txt Potion ID]
+
  | The index of the selected pattern. 0 means none is selected, 0 is also the internal id of the "base" pattern.
  |-
 
| 2003
 
| Eye of Ender entity break animation — particles and sound
 
|
 
|-
 
| 2004
 
| Mob spawn particle effect: smoke + flames
 
|
 
|-
 
| 2005
 
| Spawn “happy villager” effect (green crosses), used for bonemealing vegetation
 
|
 
 
  |}
 
  |}
  
Smoke directions:
+
For an enchanting table, the following numerical IDs are used:
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! ID
+
  ! Numerical ID
  ! Direction
+
  ! Enchantment ID
 +
! Enchantment Name
 
  |-
 
  |-
 
  | 0
 
  | 0
  | South-East
+
  | minecraft:protection
 +
| Protection
 
  |-
 
  |-
 
  | 1
 
  | 1
  | South
+
  | minecraft:fire_protection
 +
| Fire Protection
 
  |-
 
  |-
 
  | 2
 
  | 2
  | South-West
+
  | minecraft:feather_falling
 +
| Feather Falling
 
  |-
 
  |-
 
  | 3
 
  | 3
  | East
+
  | minecraft:blast_protection
 +
| Blast Protection
 
  |-
 
  |-
 
  | 4
 
  | 4
  | (Up or middle ?)
+
  | minecraft:projectile_protection
 +
| Projectile Protection
 
  |-
 
  |-
 
  | 5
 
  | 5
  | West
+
  | minecraft:respiration
 +
| Respiration
 
  |-
 
  |-
 
  | 6
 
  | 6
  | North-East
+
  | minecraft:aqua_affinity
 +
| Aqua Affinity
 
  |-
 
  |-
 
  | 7
 
  | 7
  | North
+
  | minecraft:thorns
 +
| Thorns
 
  |-
 
  |-
 
  | 8
 
  | 8
  | North-West
+
  | minecraft:depth_strider
  |}
+
  | Depth Strider
 
+
|-
==== Sound Effect ====
+
  | 9
 
+
  | minecraft:frost_walker
Used to play a sound effect on the client.
+
  | Frost Walker
 
 
Custom sounds may be added by resource packs.
 
 
 
{| class="wikitable"
 
  ! Packet ID
 
  ! State
 
  ! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="6"| 0x29
+
  | 10
  |rowspan="6"| Play
+
  | minecraft:binding_curse
|rowspan="6"| Client
+
  | Curse of Binding
| Sound name
 
  | String
 
| All known sound effect names can be seen [https://github.com/SirCmpwn/Craft.Net/blob/master/source/Craft.Net.Common/SoundEffect.cs here]
 
 
  |-
 
  |-
  | Effect position X
+
  | 11
  | Int
+
  | minecraft:sharpness
  | Effect X multiplied by 8
+
  | Sharpness
 
  |-
 
  |-
  | Effect position Y
+
  | 12
  | Int
+
  | minecraft:smite
  | Effect Y multiplied by 8
+
  | Smite
 
  |-
 
  |-
  | Effect position Z
+
  | 13
  | Int
+
  | minecraft:bane_of_arthropods
  | Effect Z multiplied by 8
+
  | Bane of Arthropods
 
  |-
 
  |-
  | Volume
+
  | 14
  | Float
+
  | minecraft:knockback
  | 1 is 100%, can be more
+
  | Knockback
 
  |-
 
  |-
  | Pitch
+
  | 15
  | Unsigned Byte
+
  | minecraft:fire_aspect
  | 63 is 100%, can be more
+
  | Fire Aspect
|}
 
 
 
==== Particle ====
 
 
 
Displays the named particle
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="11"| 0x2A
+
  | 16
  |rowspan="11"| Play
+
| minecraft:looting
  |rowspan="11"| Client
+
  | Looting
  | Particle ID
+
  |-
  | Int
+
  | 17
  | See below
+
  | minecraft:sweeping
 +
  | Sweeping Edge
 
  |-
 
  |-
  | Long Distance
+
  | 18
  | Boolean
+
  | minecraft:efficiency
  | If true, particle distance increases from 256 to 65536
+
  | Efficiency
 
  |-
 
  |-
  | X
+
  | 19
  | Float
+
  | minecraft:silk_touch
  | X position of the particle
+
  | Silk Touch
 
  |-
 
  |-
  | Y
+
  | 20
  | Float
+
  | minecraft:unbreaking
  | Y position of the particle
+
  | Unbreaking
 
  |-
 
  |-
  | Z
+
  | 21
  | Float
+
  | minecraft:fortune
  | Z position of the particle
+
  | Fortune
 
  |-
 
  |-
  | Offset X
+
  | 22
  | Float
+
  | minecraft:power
  | This is added to the X position after being multiplied by random.nextGaussian()
+
  | Power
 
  |-
 
  |-
  | Offset Y
+
  | 23
  | Float
+
  | minecraft:punch
  | This is added to the Y position after being multiplied by random.nextGaussian()
+
  | Punch
 
  |-
 
  |-
  | Offset Z
+
  | 24
  | Float
+
  | minecraft:flame
  | This is added to the Z position after being multiplied by random.nextGaussian()
+
  | Flame
 
  |-
 
  |-
  | Particle Data
+
  | 25
  | Float
+
  | minecraft:infinity
  | The data of each particle
+
  | Infinity
 
  |-
 
  |-
  | Particle Count
+
  | 26
  | Int
+
  | minecraft:luck_of_the_sea
  | The number of particles to create
+
  | Luck of the Sea
 
  |-
 
  |-
  | Data
+
  | 27
  | Array of VarInt
+
  | minecraft:lure
  | Length depends on particle. "iconcrack" has length of 2, "blockcrack", and "blockdust" have lengths of 1, the rest have 0.
+
  | Lure
|}
 
 
 
Particle IDs:
 
 
 
{| class="wikitable"
 
 
  |-
 
  |-
  ! Particle Name
+
  | 28
  ! Particle ID
+
  | minecraft:loyalty
 +
| Loyalty
 
  |-
 
  |-
  | explode
+
  | 29
  | 0
+
  | minecraft:impaling
 +
| Impaling
 
  |-
 
  |-
  | largeexplosion
+
  | 30
  | 1
+
  | minecraft:riptide
 +
| Riptide
 
  |-
 
  |-
  | hugeexplosion
+
  | 31
  | 2
+
  | minecraft:channeling
 +
| Channeling
 
  |-
 
  |-
  | fireworksSpark
+
  | 32
  | 3
+
  | minecraft:mending
 +
| Mending
 
  |-
 
  |-
  | bubble
+
  | 33
  | 4
+
  | minecraft:vanishing_curse
 +
| Curse of Vanishing
 +
|}
 +
 
 +
==== Set Slot ====
 +
 
 +
Sent by the server when an item in a slot (in a window) is added/removed.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | splash
+
  |rowspan="3"| 0x17
  | 5
+
|rowspan="3"| Play
 +
|rowspan="3"| Client
 +
| Window ID
 +
| Byte
 +
  | The window which is being updated. 0 for player inventory. Note that all known window types include the player inventory. This packet will only be sent for the currently opened window while the player is performing actions, even if it affects the player inventory. After the window is closed, a number of these packets are sent to update the player's inventory window (0).
 
  |-
 
  |-
  | wake
+
  | Slot
  | 6
+
  | Short
 +
| The slot that should be updated
 
  |-
 
  |-
  | suspended
+
  | Slot Data
  | 7
+
| [[Slot Data|Slot]]
  |-
+
  |  
  | depthsuspend
+
  |}
  | 8
+
 
 +
To set the cursor (the item currently dragged with the mouse), use -1 as Window ID and as Slot.
 +
 
 +
This packet can only be used to edit the hotbar of the player's inventory if window ID is set to 0 (slots 36 through 44).  If the window ID is set to -2, then any slot in the inventory can be used but no add item animation will be played.
 +
 
 +
==== Set Cooldown ====
 +
 
 +
Applies a cooldown period to all items with the given type. Used by the Notchian server with enderpearls.  This packet should be sent when the cooldown starts and also when the cooldown ends (to compensate for lag), although the client will end the cooldown automatically. Can be applied to any item, note that interactions still get sent to the server with the item but the client does not play the animation nor attempt to predict results (i.e block placing).
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
  ! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | crit
+
  |rowspan="2"| 0x18
  | 9
+
|rowspan="2"| Play
 +
|rowspan="2"| Client
 +
| Item ID
 +
| VarInt
 +
  | Numeric ID of the item to apply a cooldown to.
 
  |-
 
  |-
  | magicCrit
+
  | Cooldown Ticks
  | 10
+
  | VarInt
 +
| Number of ticks to apply a cooldown for, or 0 to clear the cooldown.
 +
|}
 +
 
 +
==== Plugin Message (clientbound) ====
 +
 
 +
{{Main|Plugin channels}}
 +
 
 +
Mods and plugins can use this to send their data. Minecraft itself uses several [[plugin channel]]s. These internal channels are in the <code>minecraft</code> namespace.
 +
 
 +
More documentation on this: [http://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/ http://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/]
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | smoke
+
  |rowspan="2"| 0x19
  | 11
+
|rowspan="2"| Play
 +
|rowspan="2"| Client
 +
| Channel
 +
| Identifier
 +
  | Name of the [[plugin channel]] used to send the data
 
  |-
 
  |-
  | largesmoke
+
  | Data
  | 12
+
  | Byte Array
  |-
+
  | Any data, depending on the channel. <code>minecraft:</code> channels are documented [[plugin channel|here]].  The length of this array must be inferred from the packet length.
  | spell
+
  |}
  | 13
+
 
 +
==== Named Sound Effect ====
 +
{{See also|#Sound Effect}}
 +
 
 +
Used to play a sound effect on the client. Custom sounds may be added by resource packs.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
  ! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | instantSpell
+
  |rowspan="7"| 0x1A
  | 14
+
|rowspan="7"| Play
 +
|rowspan="7"| Client
 +
| Sound Name
 +
| Identifier
 +
  | All sound effect names as of 1.15.2 can be seen [https://pokechu22.github.io/Burger/1.15.2.html#sounds here].
 
  |-
 
  |-
  | mobSpell
+
  | Sound Category
  | 15
+
  | VarInt Enum
 +
| The category that this sound will be played from ([https://gist.github.com/konwboj/7c0c380d3923443e9d55 current categories])
 
  |-
 
  |-
  | mobSpellAmbient
+
  | Effect Position X
  | 16
+
  | Int
 +
| Effect X multiplied by 8 ([[Data types#Fixed-point numbers|fixed-point number]] with only 3 bits dedicated to the fractional part)
 
  |-
 
  |-
  | witchMagic
+
  | Effect Position Y
  | 17
+
  | Int
 +
| Effect Y multiplied by 8 ([[Data types#Fixed-point numbers|fixed-point number]] with only 3 bits dedicated to the fractional part)
 
  |-
 
  |-
  | dripWater
+
  | Effect Position Z
  | 18
+
  | Int
 +
| Effect Z multiplied by 8 ([[Data types#Fixed-point numbers|fixed-point number]] with only 3 bits dedicated to the fractional part)
 
  |-
 
  |-
  | dripLava
+
  | Volume
  | 19
+
  | Float
 +
| 1 is 100%, can be more
 
  |-
 
  |-
  | angryVillager
+
  | Pitch
  | 20
+
  | Float
 +
| Float between 0.5 and 2.0 by Notchian clients
 +
|}
 +
 
 +
==== Disconnect (play) ====
 +
 
 +
Sent by the server before it disconnects a client. The client assumes that the server has already closed the connection by the time the packet arrives.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  | happyVillager
+
  | 0x1B
  | 21
+
  | Play
  |-
+
  | Client
  | townaura
+
  | Reason
  | 22
+
  | [[Chat]]
  |-
+
  | Displayed to the client when the connection terminates.
| note
+
  |}
| 23
 
|-
 
| portal
 
| 24
 
|-
 
| enchantmenttable
 
| 25
 
|-
 
| flame
 
| 26
 
|-
 
| lava
 
| 27
 
|-
 
| footstep
 
| 28
 
|-
 
| cloud
 
| 29
 
|-
 
| reddust
 
| 30
 
|-
 
| snowballpoof
 
| 31
 
|-
 
| snowshovel
 
| 32
 
|-
 
| slime
 
| 33
 
|-
 
| heart
 
| 34
 
|-
 
| barrier
 
| 35
 
|-
 
| iconcrack_(id)_(data)
 
| 36
 
|-
 
| blockcrack_(id+(data<<12))
 
| 37
 
|-
 
| blockdust_(id)
 
| 38
 
|-
 
| droplet
 
| 39
 
|-
 
| take
 
| 40
 
|-
 
| mobappearance
 
| 41
 
  |}
 
  
==== Change Game State ====
+
==== Entity Status ====
  
It appears when a bed can't be used as a spawn point and when the rain state changes.
+
Entity statuses generally trigger an animation for an entity.  The available statuses vary by the entity's type (and are available to subclasses of that type as well).
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 2,211: Line 2,288:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x2B
+
  |rowspan="2"| 0x1C
 
  |rowspan="2"| Play
 
  |rowspan="2"| Play
 
  |rowspan="2"| Client
 
  |rowspan="2"| Client
  | Reason
+
  | Entity ID
  | Unsigned Byte
+
| Int
 +
|
 +
|-
 +
| Entity Status
 +
  | Byte Enum
 
  | See below
 
  | See below
|-
 
| Value
 
| Float
 
| Depends on Reason
 
 
  |}
 
  |}
  
''Reason codes'':
+
See [[Entity statuses]] for a list of which statuses are valid for each type of entity.
  
{| class="wikitable"
+
==== Explosion ====
! Reason
 
! Effect
 
! Value
 
|-
 
| 0
 
| Invalid Bed
 
|
 
|-
 
| 1
 
| End raining
 
|
 
|-
 
| 2
 
| Begin raining
 
|
 
|-
 
| 3
 
| Change game mode
 
| 0: Survival, 1: Creative, 2: Adventure, 3: Spectator
 
|-
 
| 4
 
| Enter credits
 
|
 
|-
 
| 5
 
| Demo message
 
| 0: Show welcome to demo screen, 101: Tell movement controls, 102: Tell jump control, 103: Tell inventory control
 
|-
 
| 6
 
| Arrow hitting player
 
| Appears to be played when an arrow strikes another player in Multiplayer
 
|-
 
| 7
 
| Fade value
 
| The current darkness value. 1 = Dark, 0 = Bright, Setting the value higher causes the game to change color and freeze
 
|-
 
| 8
 
| Fade time
 
| Time in ticks for the sky to fade
 
|-
 
| 10
 
| Play mob appearance (effect and sound)
 
| Unknown
 
|}
 
  
==== Spawn Global Entity ====
+
Sent when an explosion occurs (creepers, TNT, and ghast fireballs).
  
With this packet, the server notifies the client of thunderbolts striking within a 512 block radius around the player. The coordinates specify where exactly the thunderbolt strikes.
+
Each block in Records is set to air. Coordinates for each axis in record is int(X) + record.x
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 2,283: Line 2,316:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="5"| 0x2C
+
  |rowspan="9"| 0x1D
  |rowspan="5"| Play
+
  |rowspan="9"| Play
  |rowspan="5"| Client
+
  |rowspan="9"| Client
| Entity ID
 
| VarInt
 
| The EID of the thunderbolt
 
|-
 
| Type
 
| Byte
 
| The global entity type, currently always 1 for thunderbolt
 
|-
 
 
  | X
 
  | X
  | Int
+
  | Float
  | Thunderbolt X, a [[Data Types#Fixed-point numbers|fixed-point number]]
+
  |  
 
  |-
 
  |-
 
  | Y
 
  | Y
  | Int
+
  | Float
  | Thunderbolt Y, a [[Data Types#Fixed-point numbers|fixed-point number]]
+
  |  
 
  |-
 
  |-
 
  | Z
 
  | Z
 +
| Float
 +
|
 +
|-
 +
| Strength
 +
| Float
 +
| A strength greater than or equal to 2.0 spawns a <code>minecraft:explosion_emitter</code> particle, while a lesser strength spawns a <code>minecraft:explosion</code> particle.
 +
|-
 +
| Record Count
 
  | Int
 
  | Int
  | Thunderbolt Z, a [[Data Types#Fixed-point numbers|fixed-point number]]
+
  | Number of elements in the following array
 +
|-
 +
| Records
 +
| Array of (Byte, Byte, Byte)
 +
| Each record is 3 signed bytes long; the 3 bytes are the XYZ (respectively) signed offsets of affected blocks.
 +
|-
 +
| Player Motion X
 +
| Float
 +
| X velocity of the player being pushed by the explosion
 +
|-
 +
| Player Motion Y
 +
| Float
 +
| Y velocity of the player being pushed by the explosion
 +
|-
 +
| Player Motion Z
 +
| Float
 +
| Z velocity of the player being pushed by the explosion
 
  |}
 
  |}
  
==== Open Window ====
+
==== Unload Chunk ====
  
This is sent to the client when it should open an inventory, such as a chest, workbench, or furnace. This message is not sent anywhere for clients opening their own inventory.
+
Tells the client to unload a chunk column.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 2,319: Line 2,368:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="5"| 0x2D
+
  |rowspan="2"| 0x1E
  |rowspan="5"| Play
+
  |rowspan="2"| Play
  |rowspan="5"| Client
+
  |rowspan="2"| Client
  | Window ID
+
  | Chunk X
  | Unsigned Byte
+
  | Int
  | A unique id number for the window to be displayed. Notchian server implementation is a counter, starting at 1.
+
  | Block coordinate divided by 16, rounded down
 
  |-
 
  |-
  | Window Type
+
  | Chunk Z
  | String
+
  | Int
| The window type to use for display. See [[Inventory]] for a list.
+
  | Block coordinate divided by 16, rounded down
|-
 
| Window Title
 
| [[Chat]]
 
| The title of the window
 
|-
 
| Number Of Slots
 
| Unsigned Byte
 
| Number of slots in the window (excluding the number of slots in the player inventory)
 
|-
 
| Entity ID
 
| Optional Int
 
  | EntityHorse's EID. Only sent when Window Type is “EntityHorse”
 
 
  |}
 
  |}
  
See [[Inventory]] for further information.
+
It is legal to send this packet even if the given chunk is not currently loaded.
  
==== Close Window ====
+
==== Change Game State ====
  
This packet is sent from the server to the client when a window is forcibly closed, such as when a chest is destroyed while it's open.
+
Used for a wide variety of game state things, from whether to bed use to gamemode to demo messages.
 
 
Note, notchian clients send a close window packet with Window ID 0 to close their inventory even though there is never an [[#Open Window|Open Window]] packet for inventory.  
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 2,359: Line 2,394:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  | 0x2E
+
  |rowspan="2"| 0x1F
  |rowspan="1"| Play
+
  |rowspan="2"| Play
  |rowspan="1"| Client
+
  |rowspan="2"| Client
  | Window ID
+
  | Reason
 
  | Unsigned Byte
 
  | Unsigned Byte
  | This is the ID of the window that was closed. 0 for inventory.
+
  | See below
 +
|-
 +
| Value
 +
| Float
 +
| Depends on Reason
 
  |}
 
  |}
  
==== Set Slot ====
+
''Reason codes'':
 
 
Sent by the server when an item in a slot (in a window) is added/removed.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  ! Reason
  ! State
+
  ! Effect
  ! Bound To
+
  ! Value
  ! Field Name
+
  |-
  ! Field Type
+
| 0
  ! Notes
+
| No respawn block available
 +
| Note: Sends message 'block.minecraft.spawn.not_valid'(You have no home bed or charged respawn anchor, or it was obstructed) to the client.
 +
|-
 +
| 1
 +
| End raining
 +
|
 +
|-
 +
| 2
 +
| Begin raining
 +
|
 +
|-
 +
| 3
 +
| Change gamemode
 +
| 0: Survival, 1: Creative, 2: Adventure, 3: Spectator
 +
|-
 +
| 4
 +
| Win game
 +
| 0: Just respawn player. <br>1: Roll the credits and respawn player. <br> Note that 1 is only sent by notchian server when player has not yet achieved advancement "The end?", else 0 is sent.
 +
|-
 +
| 5
 +
| Demo event
 +
| 0: Show welcome to demo screen<br> 101: Tell movement controls<br> 102: Tell jump control<br> 103: Tell inventory control<br> 104: Tell that the demo is over and print a message about how to take a screenshot
 +
|-
 +
| 6
 +
| Arrow hit player
 +
| Note: Sent when any player is struck by an arrow.
 +
|-
 +
| 7
 +
  | Rain level change
 +
  | Note: Seems to change both skycolor and lightning. <strong>[https://imgur.com/a/K6wSrkW You can see some level images here]</strong><br>This can cause [https://imgur.com/gallery/ZQX0Wd5 <strong>HUD color change in client</strong>], when level is higher than 20. It goes away only when game is restarted or client receives same packet (from any server) but with value of 0. Is this a bug?<br><br>Rain level starting from 0.
 
  |-
 
  |-
  |rowspan="3"| 0x2F
+
  | 8
  |rowspan="3"| Play
+
  | Thunder level change
  |rowspan="3"| Client
+
  | Note: Seems to change both skycolor and lightning (same as Rain level change, but doesn't start rain). It also requires rain to render by notchian client. ()<br>This can cause [https://imgur.com/gallery/ZQX0Wd5 <strong>HUD color change in client</strong>], when level is higher than 20. It goes away only when game is restarted or client receives same packet (from any server) but with value of 0. Is this a bug?<br><br>Thunder level starting from 0.
| Window ID
 
| Byte
 
| The window which is being updated. 0 for player inventory. Note that all known window types include the player inventory. This packet will only be sent for the currently opened window while the player is performing actions, even if it affects the player inventory. After the window is closed, a number of these packets are sent to update the player's inventory window (0).
 
 
  |-
 
  |-
  | Slot
+
  | 9
  | Short
+
  | Play pufferfish sting sound
| The slot that should be updated
 
 
  |-
 
  |-
  | Slot Data
+
  | 10
  | [[Slot Data|Slot]]
+
  | Play elder guardian mob appearance (effect and sound)
 
  |  
 
  |  
 +
|-
 +
| 11
 +
| Enable respawn screen
 +
|  0: Enable respawn screen, 1: Immediately respawn (sent when the doImmediateRespawn gamerule changes)
 
  |}
 
  |}
  
To set the curser (the item currently dragged with the mouse), use -1 as Window ID and as Slot
+
==== Open Horse Window ====
  
==== Window Items ====
+
This packet is used exclusively for opening the horse GUI.  [[#Open Window|Open Window]] is used for all other GUIs.
 
 
[[File:Inventory-slots.png|thumb|The inventory slots]]
 
 
 
Sent by the server when items in multiple slots (in a window) are added/removed. This includes the main inventory, equipped armour and crafting slots.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 2,411: Line 2,473:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x30
+
  |rowspan="3"| 0x20
 
  |rowspan="3"| Play
 
  |rowspan="3"| Play
 
  |rowspan="3"| Client
 
  |rowspan="3"| Client
  | Window ID
+
  | Window ID?
  | Unsigned Byte
+
  | Byte
  | The ID of window which items are being sent for. 0 for player inventory.
+
  |
 
  |-
 
  |-
  | Count
+
  | Number of slots?
  | Short
+
  | VarInt
  | Number of elements in the following array
+
  |
 
  |-
 
  |-
  | Slot Data
+
  | Entity ID?
  | Array of [[Slot Data|Slot]]
+
  | Integer
  |  
+
  |
 
  |}
 
  |}
  
See [[Inventory#Windows|inventory windows]] for further information about how slots are indexed.
+
==== Keep Alive (clientbound) ====
  
==== Window Property ====
+
The server will frequently send out a keep-alive, each containing a random ID. The client must respond with the same packet. If the client does not respond to them for over 30 seconds, the server kicks the client. Vice versa, if the server does not send any keep-alives for 20 seconds, the client will disconnect and yields a "Timed out" exception.
  
This packet is used to inform the client that part of a GUI window should be updated.
+
The Notchian server uses a system-dependent time in milliseconds to generate the keep alive ID value.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 2,441: Line 2,503:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x31
+
  |rowspan="1"| 0x21
  |rowspan="3"| Play
+
  |rowspan="1"| Play
  |rowspan="3"| Client
+
  |rowspan="1"| Client
  | Window ID
+
  | Keep Alive ID
  | Unsigned Byte
+
  | Long
 
  |  
 
  |  
|-
 
| Property
 
| Short
 
| The property to be updated, see below
 
|-
 
| Value
 
| Short
 
| The new value for the property, see below
 
 
  |}
 
  |}
  
The meaning of the Property field depends on the type of the window. The following table shows the known combinations of window type and property, and how the value is to be interpreted.
+
==== Chunk Data ====
 +
{{Main|Chunk Format}}
 +
{{See also|#Unload Chunk}}
 +
 
 +
{{Need Info|How do biomes work now?  The biome change happened at the same time as the seed change, but it's not clear how/if biomes could be computed given that it's not the actual seed...  ([https://www.reddit.com/r/Mojira/comments/e5at6i/a_discussion_for_the_changes_to_how_biomes_are/ /r/mojira discussion] which notes that it seems to be some kind of interpolation, and 3D biomes are only used in the nether)}}
 +
 
 +
The server only sends skylight information for chunk pillars in the {{Minecraft Wiki|Overworld}}, it's up to the client to know in which dimenison the player is currently located. You can also infer this information from the primary bitmask and the amount of uncompressed bytes sent.  This packet also sends all block entities in the chunk (though sending them is not required; it is still legal to send them with [[#Update Block Entity|Update Block Entity]] later).
  
 
{| class="wikitable"
 
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 
  |-
 
  |-
  ! Window type
+
  |rowspan="10"| 0x22
  ! Property
+
  |rowspan="10"| Play
  ! Value
+
  |rowspan="10"| Client
 +
| Chunk X
 +
| Int
 +
| Chunk coordinate (block coordinate divided by 16, rounded down)
 
  |-
 
  |-
  |rowspan="2"| Furnace
+
  | Chunk Z
  | 0: Progress arrow
+
  | Int
  | 0–200 (presumably in in-game ticks)
+
  | Chunk coordinate (block coordinate divided by 16, rounded down)
 
  |-
 
  |-
  | 1: Fire icon (fuel)
+
  | Full chunk
  | 0–200 (presumably in in-game ticks)
+
  | Boolean
 +
| See [[Chunk Format#Full chunk|Chunk Format]]
 
  |-
 
  |-
  |rowspan="7"| Enchantment Table
+
  | Primary Bit Mask
  | 0: Level requirement for top enchantment slot
+
  | VarInt
  |rowspan="3"| The enchantment's xp level requirement
+
  | Bitmask with bits set to 1 for every 16×16×16 chunk section whose data is included in Data. The least significant bit represents the chunk section at the bottom of the chunk column (from y=0 to y=15).
 
  |-
 
  |-
  | 1: Level requirement for middle enchantment slot
+
  | Heightmaps
 +
| [[NBT]]
 +
| Compound containing one long array named <code>MOTION_BLOCKING</code>, which is a heightmap for the highest solid block at each position in the chunk (as a compacted long array with 256 entries at 9 bits per entry totaling 36 longs). The Notchian server also adds a <code>WORLD_SURFACE</code> long array, the purpose of which is unknown, but it's not required for the chunk to be accepted.
 
  |-
 
  |-
  | 2: Level requirement for bottom enchantment slot
+
  | Biomes
 +
| Optional array of Integer
 +
| 1024 biome IDs, ordered by x then z then y, in 4&times;4&times;4 blocks.  Not present if full chunk is false.
 +
|-
 +
| Size
 +
| VarInt
 +
| Size of Data in bytes
 
  |-
 
  |-
  | 3: The seed for generating the enchantments view for the client
+
  | Data
  | Unknown
+
  | Byte array
 +
| See [[Chunk Format#Data structure|data structure]] in Chunk Format
 
  |-
 
  |-
  | 4: tooltip shown on mouse hover over top enchantment slot
+
  | Number of block entities
  |rowspan="3"| Unknown (set to -1 to hide it)
+
  | VarInt
 +
| Number of elements in the following array
 
  |-
 
  |-
  | 5: tooltip shown on mouse hover over middle enchantment slot
+
  | Block entities
  |-
+
  | Array of [[NBT|NBT Tag]]
| 6: tooltip shown on mouse hover over bottom enchantment slot
+
  | All block entities in the chunk. Use the x, y, and z tags in the NBT to determine their positions.
|-
 
  |rowspan="3"| Beacon
 
| 0: Power level
 
| Unknown
 
|-
 
| 1: First potion effect
 
| Unknown
 
|-
 
| 2: Second potion effect
 
| Unknown
 
|-
 
| Anvil
 
| 0: Repair cost
 
| The repair's cost in xp levels
 
  |-
 
| Brewing Stand
 
| 0: Brew time
 
| 0–400, with 400 making the arrow empty, and 0 making the arrow full
 
 
  |}
 
  |}
  
==== Confirm Transaction ====
+
Note that the Notchian client requires an [[#Update View Position|Update View Position]] packet when it crosses a chunk border, otherwise it'll only display render distance + 2 chunks around the chunk it spawned in.
 +
 
 +
==== Effect ====
 +
Sent when a client is to play a sound or particle effect.
  
A packet from the server indicating whether a request from the client was accepted, or whether there was a conflict (due to lag).
+
By default, the Minecraft client adjusts the volume of sound effects based on distance. The final boolean field is used to disable this, and instead the effect is played from 2 blocks away in the correct direction. Currently this is only used for effect 1023 (wither spawn), effect 1028 (enderdragon death), and effect 1038 (end portal opening); it is ignored on other effects.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 2,521: Line 2,586:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x32
+
  |rowspan="4"| 0x23
  |rowspan="3"| Play
+
  |rowspan="4"| Play
  |rowspan="3"| Client
+
  |rowspan="4"| Client
  | Window ID
+
  | Effect ID
  | Byte
+
  | Int
  | The ID of the window that the action occurred in
+
  | The ID of the effect, see below
 
  |-
 
  |-
  | Action Number
+
  | Location
  | Short
+
  | Position
  | Every action that is to be accepted has a unique number. This field corresponds to that number.
+
  | The location of the effect
 +
|-
 +
| Data
 +
| Int
 +
| Extra data for certain effects, see below
 
  |-
 
  |-
  | Accepted
+
  | Disable Relative Volume
 
  | Boolean
 
  | Boolean
  | Whether the action was accepted
+
  | See above
 
  |}
 
  |}
  
==== Update Sign ====
+
Effect IDs:
 
 
This message is sent from the server to the client whenever a sign is discovered or created. This message is NOT sent when a sign is destroyed or unloaded.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  ! ID
  ! State
+
  ! Name
! Bound To
+
  ! Data
  ! Field Name
+
  |-
  ! Field Type
+
  !colspan="3"| Sound
  ! Notes
 
 
  |-
 
  |-
  |rowspan="5"| 0x33
+
  | 1000
|rowspan="5"| Play
+
  | Dispenser dispenses
|rowspan="5"| Client
 
| Location
 
  | Position
 
 
  |  
 
  |  
 
  |-
 
  |-
  | Line 1
+
  | 1001
  | [[Chat]]
+
  | Dispenser fails to dispense
  | First line of text in the sign
+
  |  
 
  |-
 
  |-
  | Line 2
+
  | 1002
  | [[Chat]]
+
  | Dispenser shoots
  | Second line of text in the sign
+
  |  
 
  |-
 
  |-
  | Line 3
+
  | 1003
  | [[Chat]]
+
  | Ender eye launched
  | Third line of text in the sign
+
  |  
 
  |-
 
  |-
  | Line 4
+
  | 1004
  | [[Chat]]
+
  | Firework shot
  | Fourth line of text in the sign
+
  |  
|}
 
 
 
==== Map ====
 
 
 
Updates a rectangular area on a map.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
!colspan="2"| Field Name
 
!colspan="2"| Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="12"| 0x34
+
  | 1005
|rowspan="12"| Play
+
  | Iron door opened
|rowspan="12"| Client
+
  |  
  |colspan="2"| Item Damage
 
|colspan="2"| VarInt
 
  | The damage value (map ID) of the map being modified
 
 
  |-
 
  |-
  |colspan="2"| Scale
+
  | 1006
  |colspan="2"| Byte
+
  | Wooden door opened
 
  |  
 
  |  
|-
 
|colspan="2"| Icon Count
 
|colspan="2"| VarInt
 
| Number of elements in the following array
 
 
  |-
 
  |-
  |rowspan="3"| Icon
+
  | 1007
| Direction And Type
+
  | Wooden trapdoor opened
|rowspan="3"| Array
+
  |  
  | Byte
 
  | 0xF0 = Direction, 0x0F = Type
 
 
  |-
 
  |-
  | X
+
  | 1008
  | Byte
+
  | Fence gate opened
 
  |  
 
  |  
 
  |-
 
  |-
  | Z
+
  | 1009
  | Byte
+
  | Fire extinguished
 
  |  
 
  |  
|-
 
|colspan="2"| Columns
 
|colspan="2"| Byte
 
| Number of columns updated
 
 
  |-
 
  |-
  |colspan="2"| Rows
+
  | 1010
  |colspan="2"| Optional Byte
+
  | Play record
  | Only if Columns is more than 0; number of rows updated
+
  | Special case, see below for more info
 
  |-
 
  |-
  |colspan="2"| X
+
  | 1011
  |colspan="2"| Optional Byte
+
  | Iron door closed
  | Only if Columns is more than 0; x offset of the westernmost column
+
  |  
 
  |-
 
  |-
  |colspan="2"| Z
+
  | 1012
  |colspan="2"| Optional Byte
+
  | Wooden door closed
  | Only if Columns is more than 0; z offset of the northernmost row
+
  |  
 
  |-
 
  |-
  |colspan="2"| Length
+
  | 1013
  |colspan="2"| Optional VarInt
+
  | Wooden trapdoor closed
  | Only if Columns is more than 0; length of the following array
+
  |  
 
  |-
 
  |-
  |colspan="2"| Data
+
  | 1014
  |colspan="2"| Optional Array of Unsigned Byte
+
  | Fence gate closed
  | Only if Columns is more than 0; see {{Minecraft Wiki|Map item format}}
+
  |  
|}
 
 
 
==== Update Block Entity ====
 
 
 
Essentially a block update on a block entity.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="3"| 0x35
+
  | 1015
|rowspan="3"| Play
+
  | Ghast warns
|rowspan="3"| Client
 
| Location
 
  | Position
 
 
  |  
 
  |  
 
  |-
 
  |-
  | Action
+
  | 1016
  | Unsigned Byte
+
  | Ghast shoots
  | The type of update to perform, see below
+
  |  
 
  |-
 
  |-
  | NBT Data
+
  | 1017
  | Optional [[NBT|NBT Tag]]
+
  | Enderdragon shoots
| If not present then it's a TAG_END (0)
+
  |  
  |}
 
 
 
''Action'' field:
 
 
 
* '''1''': Set SpawnPotentials of a mob spawner
 
* '''2''': Set command block text (command and last execution status)
 
* '''3''': Set the level, primary, and secondary powers of a beacon
 
* '''4''': Set rotation and skin of mob head
 
* '''5''': Set type of flower in flower pot
 
* '''6''': Set base color and patterns on a banner
 
 
 
==== Open Sign Editor ====
 
 
 
Sent on placement of sign.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="1"| 0x36
+
  | 1018
|rowspan="1"| Play
+
  | Blaze shoots
|rowspan="1"| Client
 
| Location
 
  | Position
 
 
  |  
 
  |  
|}
 
 
==== Statistics ====
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
!colspan="2"| Field Name
 
!colspan="2"| Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="3"| 0x37
+
  | 1019
|rowspan="3"| Play
+
  | Zombie attacks wood door
|rowspan="3"| Client
+
  |  
  |colspan="2"| Count
 
|colspan="2"| VarInt
 
  | Number of elements in the following array
 
 
  |-
 
  |-
  |rowspan="2"| Statistic
+
  | 1020
  | Name
+
| Zombie attacks iron door
  |rowspan="2"| Array
+
|
  | String
+
|-
  | [https://gist.github.com/thinkofdeath/a1842c21a0cf2e1fb5e0 https://gist.github.com/thinkofdeath/a1842c21a0cf2e1fb5e0]
+
| 1021
 +
| Zombie breaks wood door
 +
|
 +
|-
 +
| 1022
 +
| Wither breaks block
 +
|
 +
|-
 +
| 1023
 +
| Wither spawned
 +
|
 +
|-
 +
| 1024
 +
| Wither shoots
 +
|
 +
|-
 +
| 1025
 +
| Bat takes off
 +
  |
 +
  |-
 +
| 1026
 +
  | Zombie infects
 +
  |
 
  |-
 
  |-
  | Value
+
  | 1027
  | VarInt
+
  | Zombie villager converted
  | The amount to set it to
+
  |
|}
 
 
 
==== Player List Item ====
 
 
 
Sent by the notchian server to update the user list (<tab> in the client).
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
!colspan="4"| Field Name
 
!colspan="3"| Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="19"| 0x38
+
  | 1028
|rowspan="19"| Play
+
  | Ender dragon death
|rowspan="19"| Client
+
  |
  |colspan="4"| Action
 
|colspan="3"| VarInt
 
  | Determines the rest of the Player format after the UUID
 
 
  |-
 
  |-
  |colspan="4"| Number Of Players
+
  | 1029
  |colspan="3"| VarInt
+
  | Anvil destroyed
  | Number of elements in the following array
+
  |  
 
  |-
 
  |-
  |rowspan="17"| Player
+
  | 1030
|colspan="3"| UUID
+
  | Anvil used
  |rowspan="17"| Array
 
|colspan="2"| UUID
 
 
  |  
 
  |  
 
  |-
 
  |-
  ! Action
+
  | 1031
  !colspan="2"| Field Name
+
  | Anvil landed
  !colspan="2"|  
+
  |
!
 
 
  |-
 
  |-
  |rowspan="10"| 0: add player
+
  | 1032
|colspan="2"| Name
+
  | Portal travel
  |colspan="2"| String
 
 
  |  
 
  |  
 
  |-
 
  |-
  |colspan="2"| Number Of Properties
+
  | 1033
  |colspan="2"| VarInt
+
  | Chorus flower grown
  | Number of elements in the following array
+
  |
 
  |-
 
  |-
  |rowspan="4"| Property
+
  | 1034
| Name
+
  | Chorus flower died
|rowspan="4"| Array
 
  | String
 
 
  |  
 
  |  
 
  |-
 
  |-
  | Value
+
  | 1035
  | String
+
  | Brewing stand brewed
  |  
+
  |
  |-  
+
  |-
  | Is Signed
+
  | 1036
  | Boolean
+
  | Iron trapdoor opened
 
  |  
 
  |  
 
  |-
 
  |-
  | Signature
+
  | 1037
  | Optional String
+
  | Iron trapdoor closed
  | Only if Is Signed is true
+
  |
 
  |-
 
  |-
  |colspan="2"| Gamemode
+
  | 1038
  |colspan="2"| VarInt
+
  | End portal created in overworld
  |  
+
  |
 
  |-
 
  |-
  |colspan="2"| Ping
+
  | 1039
  |colspan="2"| VarInt
+
  | Phantom bites
  |  
+
  |
 
  |-
 
  |-
  |colspan="2"| Has Display Name
+
  | 1040
  |colspan="2"| Boolean
+
  | Zombie converts to drowned
  |  
+
  |
 
  |-
 
  |-
  |colspan="2"| Display Name
+
  | 1041
  |colspan="2"| Optional [[Chat]]
+
  | Husk converts to zombie by drowning
  | Only if Has Display Name is true
+
  |
 
  |-
 
  |-
  | 1: update gamemode
+
  | 1042
  |colspan="2"| Gamemode
+
  | Grindstone used
|colspan="2"| VarInt
+
  |
|
 
|-
 
| 2: update latency
 
|colspan="2"| Ping
 
|colspan="2"| VarInt
 
  |  
 
 
  |-
 
  |-
  |rowspan="2"| 3: update display name
+
  | 1043
|colspan="2"| Has Display Name
+
  | Book page turned
  |colspan="2"| Boolean
+
  |
  |  
 
 
  |-
 
  |-
|colspan="2"| Display Name
 
|colspan="2"| Optional [[Chat]]
 
| Only send if Has Display Name is true
 
 
  |-
 
  |-
  | 4: remove player
+
!colspan="3"| Particle
  |colspan="2"| ''no fields''
+
|-
  |colspan="2"| ''no fields''
+
| 1500
 +
| Composter composts
 +
|
 +
|-
 +
| 1501
 +
| Lava converts block (either water to stone, or removes existing blocks such as torches)
 +
|
 +
|-
 +
| 1502
 +
| Redstone torch burns out
 +
|
 +
|-
 +
| 1503
 +
| Ender eye placed
 +
|
 +
|-
 +
| 2000
 +
| Spawns 10 smoke particles, e.g. from a fire
 +
| Direction, see below
 +
|-
 +
| 2001
 +
| Block break + block break sound
 +
| Block state, as an index into the global palette
 +
  |-
 +
| 2002
 +
| Splash potion. Particle effect + glass break sound.
 +
| [http://minecraft.gamepedia.com/Data_values#Potions Potion ID]
 +
  |-
 +
| 2003
 +
| Eye of Ender entity break animation — particles and sound
 +
|
 +
|-
 +
| 2004
 +
| Mob spawn particle effect: smoke + flames
 +
|
 +
|-
 +
| 2005
 +
| Bonemeal particles
 +
| How many particles to spawn (if set to 0, 15 are spawned)
 +
|-
 +
| 2006
 +
| Dragon breath
 +
|
 +
|-
 +
| 2007
 +
| Instant splash potion
 +
| [http://minecraft.gamepedia.com/Data_values#Potions Potion ID]
 +
|-
 +
| 2008
 +
| Ender dragon destroys block
 +
|
 +
|-
 +
| 2009
 +
| Wet sponge vaporizes in nether
 +
|
 +
|-
 +
  | 3000
 +
| End gateway spawn
 
  |  
 
  |  
 +
|-
 +
| 3001
 +
| Enderdragon growl
 +
|
 
  |}
 
  |}
  
==== Player Abilities ====
+
Smoke directions:
 
 
The latter 2 floats are used to indicate the walking and flying speeds respectively, while the first byte is used to determine the value of 4 booleans.
 
 
 
The flags are whether damage is disabled (god mode, 8, bit 3), whether the player can fly (4, bit 2), whether the player is flying (2, bit 1), and whether the player is in creative mode (1, bit 0).
 
 
 
To get the values of these booleans, simply AND (&) the byte with 1,2,4 and 8 respectively, to get the 0 or 1 bitwise value. To set them OR (|) them with their repspective masks.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  ! ID
  ! State
+
  ! Direction
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="3"| 0x39
+
  | 0
  |rowspan="3"| Play
+
| South-East
  |rowspan="3"| Client
+
|-
  | Flags
+
| 1
  | Byte
+
| South
  | Bit mask, see above
+
|-
 +
| 2
 +
| South-West
 +
|-
 +
| 3
 +
| East
 +
|-
 +
  | 4
 +
| (Up or middle ?)
 +
|-
 +
  | 5
 +
| West
 +
  |-
 +
  | 6
 +
  | North-East
 
  |-
 
  |-
  | Flying Speed
+
  | 7
| Float
+
  | North
  |  
 
 
  |-
 
  |-
  | Walking Speed
+
  | 8
| Float
+
  | North-West
  |  
 
 
  |}
 
  |}
  
==== Tab-Complete ====
+
Play record: This is actually a special case within this packet. You can start/stop a record at a specific location. Use a valid {{Minecraft Wiki|Music Discs|Record ID}} to start a record (or overwrite a currently playing one), any other value will stop the record.  See [[Data Generators]] for information on item IDs.
 +
 
 +
==== Particle ====
  
The server responds with a list of auto-completions of the last word sent to it. In the case of regular chat, this is a player username. Command names and parameters are also supported.
+
Displays the named particle
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 2,870: Line 2,907:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x3A
+
  |rowspan="11"| 0x24
  |rowspan="2"| Play
+
  |rowspan="11"| Play
  |rowspan="2"| Client
+
  |rowspan="11"| Client
  | Count
+
  | Particle ID
  | VarInt
+
| Int
  | Number of elements in the following array
+
| The particle ID listed in [[#Particle|the particle data type]].
 +
|-
 +
| Long Distance
 +
| Boolean
 +
| If true, particle distance increases from 256 to 65536
 +
|-
 +
| X
 +
| Double
 +
| X position of the particle
 +
|-
 +
| Y
 +
| Double
 +
| Y position of the particle
 +
|-
 +
| Z
 +
| Double
 +
| Z position of the particle
 +
|-
 +
| Offset X
 +
| Float
 +
| This is added to the X position after being multiplied by random.nextGaussian()
 +
|-
 +
| Offset Y
 +
| Float
 +
| This is added to the Y position after being multiplied by random.nextGaussian()
 +
|-
 +
| Offset Z
 +
| Float
 +
| This is added to the Z position after being multiplied by random.nextGaussian()
 +
|-
 +
| Particle Data
 +
| Float
 +
| The data of each particle
 +
|-
 +
| Particle Count
 +
  | Int
 +
  | The number of particles to create
 
  |-
 
  |-
  | Matches
+
  | Data
  | Array of String
+
  | Varies
  | One eligible command, note that each command is sent separately instead of in a single string, hence the need for Count
+
  | The variable data listed in [[#Particle|the particle data type]].
 
  |}
 
  |}
  
==== Scoreboard Objective ====
+
==== Update Light ====
  
This is sent to the client when it should create a new {{Minecraft Wiki|scoreboard}} objective or remove one.
+
Updates light levels for a chunk.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 2,890: Line 2,963:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
  ! Field Type
+
  !colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="4"| 0x3B
+
  |rowspan="10"| 0x25
  |rowspan="4"| Play
+
  |rowspan="10"| Play
  |rowspan="4"| Client
+
  |rowspan="10"| Client
  | Objective Name
+
  |colspan="2"| Chunk X
  | String
+
  |colspan="2"| VarInt
  | An unique name for the objective
+
  | Chunk coordinate (block coordinate divided by 16, rounded down)
 +
|-
 +
|colspan="2"| Chunk Z
 +
|colspan="2"| VarInt
 +
| Chunk coordinate (block coordinate divided by 16, rounded down)
 +
|-
 +
|colspan="2"| Sky Light Mask
 +
|colspan="2"| VarInt
 +
| Mask containing 18 bits, with the lowest bit corresponding to chunk section -1 (in the void, y=-16 to y=-1) and the highest bit for chunk section 16 (above the world, y=256 to y=271)
 +
|-
 +
|colspan="2"| Block Light Mask
 +
|colspan="2"| VarInt
 +
| Mask containing 18 bits, with the same order as sky light
 +
|-
 +
|colspan="2"| Empty Sky Light Mask
 +
|colspan="2"| VarInt
 +
| Mask containing 18 bits, which indicates sections that have 0 for all their sky light values.  If a section is set in both this mask and the main sky light mask, it is ignored for this mask and it is included in the sky light arrays (the notchian server does not create such masks).  If it is only set in this mask, it is not included in the sky light arrays.
 +
|-
 +
|colspan="2"| Empty Block Light Mask
 +
|colspan="2"| VarInt
 +
| Mask containing 18 bits, which indicates sections that have 0 for all their block light values.  If a section is set in both this mask and the main block light mask, it is ignored for this mask and it is included in the block light arrays (the notchian server does not create such masks).  If it is only set in this mask, it is not included in the block light arrays.
 +
|-
 +
|rowspan="2"| Sky Light arrays
 +
| Length
 +
|rowspan="2"| Array
 +
| VarInt
 +
| Length of the following array in bytes (always 2048)
 
  |-
 
  |-
  | Mode
+
  | Sky Light array
  | Byte
+
  | Array of 2048 bytes
  | 0 to create the scoreboard. 1 to remove the scoreboard. 2 to update the display text.  
+
  | There is 1 array for each bit set to true in the sky light mask, starting with the lowest value. Half a byte per light value.
 
  |-
 
  |-
  | Objective Value
+
  |rowspan="2"| Block Light arrays
  | Optional String
+
  | Length
  | Only if mode is 0 or 2. The text to be displayed for the score
+
  |rowspan="2"| Array
 +
| VarInt
 +
| Length of the following array in bytes (always 2048)
 
  |-
 
  |-
  | Type
+
  | Block Light array
  | Optional String
+
  | Array of 2048 bytes
  | Only if mode is 0 or 2. “integer” or “hearts”
+
  | There is 1 array for each bit set to true in the block light mask, starting with the lowest value.  Half a byte per light value.
 
  |}
 
  |}
  
==== Update Score ====
+
Individual block or sky light arrays are is given for each block with increasing x coordinates, within rows of increasing z coordinates, within layers of increasing y coordinates. Even-indexed items (those with an even x coordinate, starting at 0) are packed into the low bits, odd-indexed into the high bits.
 +
 
 +
==== Join Game ====
  
This is sent to the client when it should update a scoreboard item.  
+
See [[Protocol Encryption]] for information on logging in.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 2,926: Line 3,029:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="4"| 0x3C
+
  |rowspan="9"| 0x26
  |rowspan="4"| Play
+
  |rowspan="9"| Play
  |rowspan="4"| Client
+
  |rowspan="9"| Client
  | Score Name
+
  | Entity ID
  | String
+
  | Int
  | The name of the score to be updated or removed
+
  | The player's Entity ID (EID)
 +
|-
 +
| Gamemode
 +
| Unsigned Byte
 +
| 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. Bit 3 (0x8) is the hardcore flag.
 +
|-
 +
| Dimension
 +
| Int Enum
 +
| -1: Nether, 0: Overworld, 1: End; also, note that this is not a VarInt but instead a regular int.
 +
|-
 +
| Hashed seed
 +
| Long
 +
| First 8 bytes of the SHA-256 hash of the world's seed.
 +
|-
 +
| Max Players
 +
| Unsigned Byte
 +
| Was once used by the client to draw the player list, but now is ignored
 +
|-
 +
| Level Type
 +
| String Enum (16)
 +
| default, flat, largeBiomes, amplified, customized, buffet, default_1_1
 
  |-
 
  |-
  | Action
+
  | View Distance
  | Byte
+
  | VarInt
  | 0 to create/update an item. 1 to remove an item.
+
  | Render distance (2-32)
 
  |-
 
  |-
  | Objective Name
+
  | Reduced Debug Info
  | String
+
  | Boolean
  | The name of the objective the score belongs to
+
  | If true, a Notchian client shows reduced information on the {{Minecraft Wiki|debug screen}}.  For servers in development, this should almost always be false.
 
  |-
 
  |-
  | Value
+
  | Enable respawn screen
  | Optional VarInt
+
  | Boolean
  | The score to be displayed next to the entry. Only sent when Action does not equal 1.
+
  | Set to false when the doImmediateRespawn gamerule is true
 
  |}
 
  |}
  
==== Display Scoreboard ====
+
==== Map Data ====
  
This is sent to the client when it should display a scoreboard.
+
Updates a rectangular area on a {{Minecraft Wiki|map}} item.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 2,954: Line 3,077:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
  ! Field Type
+
  !colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x3D
+
  |rowspan="17"| 0x27
  |rowspan="2"| Play
+
  |rowspan="17"| Play
  |rowspan="2"| Client
+
  |rowspan="17"| Client
  | Position
+
  |colspan="2"| Map ID
  | Byte
+
  |colspan="2"| VarInt
  | The position of the scoreboard. 0: list, 1: sidebar, 2: below name.
+
  | Map ID of the map being modified
 
  |-
 
  |-
  | Score Name
+
  |colspan="2"| Scale
  | String
+
  |colspan="2"| Byte
  | The unique name for the scoreboard to be displayed.
+
  | From 0 for a fully zoomed-in map (1 block per pixel) to 4 for a fully zoomed-out map (16 blocks per pixel)
  |}
+
  |-
 
+
|colspan="2"| Tracking Position
==== Teams ====
+
|colspan="2"| Boolean
 
+
| Specifies whether player and item frame icons are shown
Creates and updates teams.
+
|-
 
+
|colspan="2"| Locked
{| class="wikitable"
+
  |colspan="2"| Boolean
  ! Packet ID
+
  | True if the map has been locked in a cartography table
  ! State
+
  |-
  ! Bound To
+
  |colspan="2"| Icon Count
  ! Field Name
+
  |colspan="2"| VarInt
  ! Field Type
+
  | Number of elements in the following array
  ! Notes
 
 
  |-
 
  |-
  |rowspan="10"| 0x3E
+
  |rowspan="6"| Icon
  |rowspan="10"| Play
+
  | Type
  |rowspan="10"| Client
+
  |rowspan="6"| Array
| Team Name
+
  | VarInt enum
  | String
+
  | See below
  | A unique name for the team. (Shared with scoreboard).
 
 
  |-
 
  |-
  | Mode
+
  | X
 
  | Byte
 
  | Byte
  | If 0 then the team is created.
+
  | Map coordinates: -128 for furthest left, +127 for furthest right
 
 
If 1 then the team is removed.
 
 
 
If 2 the team team information is updated.
 
 
 
If 3 then new players are added to the team.
 
 
 
If 4 then players are removed from the team.
 
 
  |-
 
  |-
  | Team Display Name
+
  | Z
  | Optional String
+
  | Byte
  | Only if Mode = 0 or 2.
+
  | Map coordinates: -128 for highest, +127 for lowest
 
  |-
 
  |-
  | Team Prefix
+
  | Direction
  | Optional String
+
  | Byte
  | Only if Mode = 0 or 2. Displayed before the players' name that are part of this team
+
  | 0-15
 
  |-
 
  |-
  | Team Suffix
+
  | Has Display Name
  | Optional String
+
  | Boolean
  | Only if Mode = 0 or 2. Displayed after the players' name that are part of this team
+
  |
 
  |-
 
  |-
  | Friendly Fire
+
  | Display Name
  | Optional Byte
+
  | Optional [[Chat]]
  | Only if Mode = 0 or 2. 0 for off, 1 for on, 3 for seeing friendly invisibles
+
  | Only present if previous Boolean is true
  |-
+
|-
  | Name Tag Visibility
+
|colspan="2"| Columns
  | Optional String
+
|colspan="2"| Unsigned Byte
  | Only if Mode = 0 or 2. always, hideForOtherTeams, hideForOwnTeam, never
+
| Number of columns updated
 +
|-
 +
|colspan="2"| Rows
 +
|colspan="2"| Optional Byte
 +
| Only if Columns is more than 0; number of rows updated
 +
  |-
 +
  |colspan="2"| X
 +
  |colspan="2"| Optional Byte
 +
  | Only if Columns is more than 0; x offset of the westernmost column
 
  |-
 
  |-
  | Color
+
  |colspan="2"| Z
  | Optional Byte
+
  |colspan="2"| Optional Byte
  | Only if Mode = 0 or 2. Same as [[Chat]] colors
+
  | Only if Columns is more than 0; z offset of the northernmost row
 
  |-
 
  |-
  | Player Count
+
  |colspan="2"| Length
  | Optional VarInt
+
  |colspan="2"| Optional VarInt
  | Only if Mode = 0 or 3 or 4. Number of players in the array
+
  | Only if Columns is more than 0; length of the following array
 
  |-
 
  |-
  | Players
+
  |colspan="2"| Data
  | Optional Array of String
+
  |colspan="2"| Optional Array of Unsigned Byte
  | Only if Mode = 0 or 3 or 4. Players to be added/remove from the team. Max 40 characters so may be uuid's later
+
  | Only if Columns is more than 0; see {{Minecraft Wiki|Map item format}}
 
  |}
 
  |}
  
==== Plugin Message ====
+
For icons, a direction of 0 is a vertical icon and increments by 22.5&deg; (360/16).
  
Mods and plugins can use this to send their data. Minecraft itself uses a number of [[plugin channel]]s. These internal channels are prefixed with <code>MC|</code>.
+
Types are based off of rows and columns in <code>map_icons.png</code>:
 
 
More documentation on this: [http://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/ http://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/]
 
  
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="2"| 0x3F
+
! Icon type
  |rowspan="2"| Play
+
! Result
  |rowspan="2"| Client
+
  |-
  | Channel
+
  | 0
  | String
+
  | White arrow (players)
  | Name of the [[plugin channel]] used to send the data
+
  |-
 +
  | 1
 +
  | Green arrow (item frames)
 
  |-
 
  |-
  | Data
+
  | 2
  | Byte Array
+
  | Red arrow
| Any data, depending on the channel. <code><nowiki>MC|</nowiki></code> channels are documented [[plugin channel|here]].
 
|}
 
 
 
==== Disconnect ====
 
 
 
Sent by the server before it disconnects a client. The server assumes that the sender has already closed the connection by the time the packet arrives.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  | 0x40
+
  | 3
  |rowspan="1"| Play
+
  | Blue arrow
|rowspan="1"| Client
 
| Reason
 
| [[Chat]]
 
| Displayed to the client when the connection terminates.
 
|}
 
 
 
==== Server Difficulty ====
 
 
 
Changes the difficulty setting in the client's option menu
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="1"| 0x41
+
  | 4
|rowspan="1"| Play
+
  | White cross
|rowspan="1"| Client
 
  | Difficulty
 
| Unsigned Byte
 
| 0: peaceful, 1: easy, 2: normal, 3: hard
 
|}
 
 
 
==== Combat Event ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="6"| 0x42
+
  | 5
|rowspan="6"| Play
+
  | Red pointer
  |rowspan="6"| Client
+
  |-
  | Event
+
  | 6
  | VarInt
+
  | White circle (off-map players)
  | 0: enter combat, 1: end combat, 2: entity dead
 
 
  |-
 
  |-
  | Duration
+
  | 7
  | Optional VarInt
+
  | Small white circle (far-off-map players)
| Only for end combat
 
 
  |-
 
  |-
  | Player ID
+
  | 8
  | Optional VarInt
+
  | Mansion
| Only for entity dead
 
 
  |-
 
  |-
  | Entity ID
+
  | 9
  | Optional Int
+
  | Temple
| Only for end combat and entity dead
 
 
  |-
 
  |-
  | Message
+
  | 10
  | String
+
  | White Banner
| Only for entity dead
 
|}
 
 
 
==== Camera ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="1"| 0x43
+
  | 11
|rowspan="1"| Play
+
  | Orange Banner
|rowspan="1"| Client
 
| Camera ID
 
| VarInt
 
|
 
|}
 
 
 
==== World Border ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
  ! State
 
! Bound To
 
!colspan="2"| Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="18"| 0x44
+
  | 12
|rowspan="18"| Play
+
  | Magenta Banner
|rowspan="18"| Client
 
|colspan="2"| Action
 
| VarInt
 
  | Determines the format of the rest of the packet
 
 
  |-
 
  |-
  ! Action
+
  | 13
  ! Field Name
+
  | Light Blue Banner
!
 
!
 
 
  |-
 
  |-
  | 0: set size
+
  | 14
  | Radius
+
  | Yellow Banner
| Double
 
| meters
 
 
  |-
 
  |-
  |rowspan="3"| 1: lerp size
+
  | 15
| Old Radius
+
  | Lime Banner
| Double
 
  | meters
 
 
  |-
 
  |-
  | New Radius
+
  | 16
  | Double
+
  | Pink Banner
| meters
 
 
  |-
 
  |-
  | Speed
+
  | 17
  | VarLong
+
  | Gray Banner
| number of real-time ticks/seconds (?) until New Radius is reached. From experiments, it appears that Notchian server does not sync world border speed to game ticks, so it gets out of sync with server lag
 
 
  |-
 
  |-
  |rowspan="2"| 2: set center
+
  | 18
| X
+
  | Light Gray Banner
| Double
 
  |  
 
 
  |-
 
  |-
  | Z
+
  | 19
| Double
+
  | Cyan Banner
  |  
 
 
  |-
 
  |-
  |rowspan="8"| 3: initialize
+
  | 20
| X
+
  | Purple Banner
| Double
 
  |  
 
 
  |-
 
  |-
  | Z
+
  | 21
| Double
+
  | Blue Banner
  |  
 
 
  |-
 
  |-
  | Old Radius
+
  | 22
| Double
+
  | Brown Banner
  |  
 
 
  |-
 
  |-
  | New Radius
+
  | 23
| Double
+
  | Green Banner
  |  
 
 
  |-
 
  |-
  | Speed
+
  | 24
| VarLong
+
  | Red Banner
  |  
 
 
  |-
 
  |-
  | Portal Teleport Boundary
+
  | 25
  | VarInt
+
  | Black Banner
| Resulting coordinates from a portal teleport are limited to +-value. Usually 29999984.
 
 
  |-
 
  |-
  | Warning Time
+
  | 26
| VarInt
+
  | Treasure marker
|
 
|-
 
| Warning Blocks
 
| VarInt
 
|
 
|-
 
|rowspan="1"| 4: set warning time
 
| Warning Time
 
| VarInt
 
| unit?
 
|-
 
|rowspan="1"| 5: set warning blocks
 
| Warning Blocks
 
| VarInt
 
  |  
 
 
  |}
 
  |}
  
==== Title ====  
+
==== Trade List ====
 +
 
 +
The list of trades a villager NPC is offering.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,252: Line 3,255:
 
  ! Bound To
 
  ! Bound To
 
  !colspan="2"| Field Name
 
  !colspan="2"| Field Name
  ! Field Type
+
  !colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="9"| 0x45
+
  |rowspan="18"| 0x28
  |rowspan="9"| Play
+
  |rowspan="18"| Play
  |rowspan="9"| Client
+
  |rowspan="18"| Client
  |colspan="2"| Action
+
|-
  | VarInt
+
  | colspan="2" | Window ID
  |  
+
  | colspan="2" | VarInt
 +
  | The ID of the window that is open; this is an int rather than a byte.
 +
|-
 +
| colspan="2" | Size
 +
| colspan="2" | Byte
 +
| The number of trades in the following array
 
  |-
 
  |-
  ! Action
+
  | rowspan="11" | Trades
  ! Field Name
+
  | Input item 1
  !
+
  | rowspan="11" | Array
  !
+
  | [[Slot]]
 +
| The first item the villager is buying
 
  |-
 
  |-
  | 0: set title
+
  | Output item
| Title Text
+
  | [[Slot]]
  | [[Chat]]
+
  | The item the villager is selling
  |  
 
 
  |-
 
  |-
  | 1: set subtitle
+
  | Has second item
  | Subtitle Text
+
  | Boolean
  | [[Chat]]
+
  | Whether there is a second item
  |  
+
|-
 +
| Input item 2
 +
| Optional [[Slot]]
 +
| The second item the villager is buying; only present if they have a second item.
 +
|-
 +
| Trade disabled
 +
| Boolean
 +
| True if the trade is disabled; false if the trade is enabled.
 +
|-
 +
| Number of trade uses
 +
| Integer
 +
| Number of times the trade has been used so far
 +
|-
 +
| Maximum number of trade uses
 +
| Integer
 +
| Number of times this trade can be used
 +
|-
 +
| XP
 +
| Integer
 +
|
 +
|-
 +
| Special Price
 +
| Integer
 +
|
 +
|-
 +
| Price Multiplier
 +
| Float
 +
  |
 
  |-
 
  |-
  |rowspan="3"| 2: set times and display
+
  | Demand
| Fade In
+
  | Integer
  | Int
+
  |
  | ticks
 
 
  |-
 
  |-
  | Stay
+
  |colspan="2"| Villager level
  | Int
+
  |colspan="2"| VarInt
  | ticks
+
  | Appears on the trade GUI; meaning comes from the translation key <code>merchant.level.</code> + level.
 +
1: Novice, 2: Apprentice, 3: Journeyman, 4: Expert, 5: Master
 
  |-
 
  |-
  | Fade Out
+
  |colspan="2"| Experience
  | Int
+
  |colspan="2"| VarInt
  | ticks
+
  | Total experience for this villager (always 0 for the wandering trader)
 
  |-
 
  |-
  | 3: hide
+
  |colspan="2"| Is regular villager
  | ''no fields''
+
  |colspan="2"| Boolean
  | ''no fields''
+
  | True if this is a regular villager; false for the wandering trader. When false, hides the villager level and some other GUI elements.
  |
 
 
  |-
 
  |-
  | 4: reset
+
  |colspan="2"| Can restock
  | ''no fields''
+
  |colspan="2"| Boolean
  | ''no fields''
+
  | True for regular villagers and false for the wandering trader. If true, the "Villagers restock up to two times per day." message is displayed when hovering over disabled trades.
  |
 
 
  |}
 
  |}
  
“Hide” makes the title disappear, but if you run times again the same title will appear. “Reset” erases the text.
+
[[File:1.14-merchant-slots.png|thumb|The merchant UI, for reference]]
 +
{{-}}
 +
 
 +
==== Entity Position ====
  
==== Set Compression ====
+
This packet is sent by the server when an entity moves less then 8 blocks; if an entity moves more than 8 blocks [[#Entity Teleport|Entity Teleport]] should be sent instead.
  
{{Warning|This packet is completely broken and will be removed in a future 1.9 snapshot, as announced by Grum in #mcdevs on 2015-11-09 20:00:34 UTC. The packet [[#Set Compression 2|Set Compression]] ([[#Login|Login]], 0x03, clientbound) should be used instead.}}
+
This packet allows at most 8 blocks movement in any direction, because short range is from -32768 to 32767. And <code>32768 / (128 * 32)</code> = 8.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,315: Line 3,351:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x46
+
  |rowspan="5"| 0x29
  |rowspan="1"| Play
+
  |rowspan="5"| Play
  |rowspan="1"| Client
+
  |rowspan="5"| Client
  | Threshold
+
  | Entity ID
 
  | VarInt
 
  | VarInt
  | Packets of this size or higher ''may'' be compressed
+
  |  
  |}
+
|-
 
+
| Delta X
==== Player List Header And Footer ====
+
| Short
 +
| Change in X position as <code>(currentX * 32 - prevX * 32) * 128</code>
 +
|-
 +
| Delta Y
 +
| Short
 +
| Change in Y position as <code>(currentY * 32 - prevY * 32) * 128</code>
 +
|-
 +
| Delta Z
 +
| Short
 +
| Change in Z position as <code>(currentZ * 32 - prevZ * 32) * 128</code>
 +
|-
 +
| On Ground
 +
| Boolean
 +
|
 +
  |}
 +
 
 +
==== Entity Position and Rotation ====
 +
 
 +
This packet is sent by the server when an entity rotates and moves. Since a short range is limited from -32768 to 32767, and movement is offset of fixed-point numbers, this packet allows at most 8 blocks movement in any direction. (<code>-32768 / (32 * 128) == -8</code>)
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,333: Line 3,387:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x47
+
  |rowspan="7"| 0x2A
  |rowspan="2"| Play
+
  |rowspan="7"| Play
  |rowspan="2"| Client
+
  |rowspan="7"| Client
  | Header
+
  | Entity ID
  | [[Chat]]
+
  | VarInt
 
  |  
 
  |  
 
  |-
 
  |-
  | Footer
+
  | Delta X
  | [[Chat]]
+
  | Short
 +
| Change in X position as <code>(currentX * 32 - prevX * 32) * 128</code>
 +
|-
 +
| Delta Y
 +
| Short
 +
| Change in Y position as <code>(currentY * 32 - prevY * 32) * 128</code>
 +
|-
 +
| Delta Z
 +
| Short
 +
| Change in Z position as <code>(currentZ * 32 - prevZ * 32) * 128</code>
 +
|-
 +
| Yaw
 +
| Angle
 +
| New angle, not a delta
 +
|-
 +
| Pitch
 +
| Angle
 +
| New angle, not a delta
 +
|-
 +
| On Ground
 +
| Boolean
 
  |  
 
  |  
 
  |}
 
  |}
  
==== Resource Pack Send ====  
+
==== Entity Rotation ====
 +
 
 +
This packet is sent by the server when an entity rotates.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,355: Line 3,431:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x48
+
  |rowspan="4"| 0x2B
  |rowspan="2"| Play
+
  |rowspan="4"| Play
  |rowspan="2"| Client
+
  |rowspan="4"| Client
| URL
 
| String
 
| The URL to the resource pack.
 
|-
 
| Hash
 
| String
 
| A 40 character hexadecimal and lowercase [[wikipedia:SHA-1|SHA-1]] hash of the resource pack file. (must be lower case in order to work)<br />If it's not a 40 character hexadecimal string, the client will not use it for hash verification and likely waste bandwidth — but it will still treat it as a unique id
 
|}
 
 
 
==== Update Entity NBT ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="2"| 0x49
 
|rowspan="2"| Play
 
|rowspan="2"| Client
 
 
  | Entity ID
 
  | Entity ID
 
  | VarInt
 
  | VarInt
 
  |  
 
  |  
 
  |-
 
  |-
  | Tag
+
  | Yaw
  | [[NBT|NBT Tag]]
+
  | Angle
 +
| New angle, not a delta
 +
|-
 +
| Pitch
 +
| Angle
 +
| New angle, not a delta
 +
|-
 +
| On Ground
 +
| Boolean
 
  |  
 
  |  
 
  |}
 
  |}
  
=== Serverbound ===
+
==== Entity Movement ====
  
==== Keep Alive ====
+
This packet may be used to initialize an entity.
  
The server will frequently send out a keep-alive, each containing a random ID. The client must respond with the same packet.
+
For player entities, either this packet or any move/look packet is sent every game tick. So the meaning of this packet is basically that the entity did not move/look since the last such packet.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,403: Line 3,465:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x00
+
  |rowspan="1"| 0x2C
 
  |rowspan="1"| Play
 
  |rowspan="1"| Play
  |rowspan="1"| Server
+
  |rowspan="1"| Client
  | Keep Alive ID
+
  | Entity ID
 
  | VarInt
 
  | VarInt
 
  |  
 
  |  
 
  |}
 
  |}
  
==== Chat Message ====
+
==== Vehicle Move (clientbound) ====
  
The default server will check the message to see if it begins with a '/'. If it doesn't, the username of the sender is prepended and sent to all other clients (including the original sender). If it does, the server assumes it to be a command and attempts to process it. A message longer than 100 characters will cause the server to kick the client. This change was initially done by allowing the client to not slice the message up to 119 (the previous limit), without changes to the server. For this reason, the vanilla server kept the code to cut messages at 119, but this isn't a protocol limitation and can be ignored.
+
Note that all fields use absolute positioning and do not allow for relative positioning.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,423: Line 3,485:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x01
+
  |rowspan="5"| 0x2D
  |rowspan="1"| Play
+
  |rowspan="5"| Play
  |rowspan="1"| Server
+
  |rowspan="5"| Client
  | Message
+
  | X
  | String
+
  | Double
  | The client sends the raw input, not [[Chat]]
+
  | Absolute position (X coordinate)
 +
|-
 +
| Y
 +
| Double
 +
| Absolute position (Y coordinate)
 +
|-
 +
| Z
 +
| Double
 +
| Absolute position (Z coordinate)
 +
|-
 +
| Yaw
 +
| Float
 +
| Absolute rotation on the vertical axis, in degrees
 +
|-
 +
| Pitch
 +
| Float
 +
| Absolute rotation on the horizontal axis, in degrees
 
  |}
 
  |}
  
==== Use Entity ====
+
==== Open Book ====
  
This packet is sent from the client to the server when the client attacks or right-clicks another entity (a player, minecart, etc).
+
Sent when a player right clicks with a signed book. This tells the client to open the book GUI.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
|rowspan="1"| 0x2E
 +
|rowspan="1"| Play
 +
|rowspan="1"| Client
 +
| Hand
 +
| VarInt enum
 +
| 0: Main hand, 1: Off hand
 +
|}
  
A Notchian server only accepts this packet if the entity being attacked/used is visible without obstruction and within a 4-unit radius of the player's position.
+
==== Open Window ====
  
Note that middle-click in creative mode is interpreted by the client and sent as a [[#Creative Inventory Action|Creative Inventory Action]] packet instead.
+
This is sent to the client when it should open an inventory, such as a chest, workbench, or furnace. This message is not sent anywhere for clients opening their own inventory.  For horses, use [[#Open Horse Window|Open Horse Window]].
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,447: Line 3,541:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="5"| 0x02
+
  |rowspan="3"| 0x2F
  |rowspan="5"| Play
+
  |rowspan="3"| Play
  |rowspan="5"| Server
+
  |rowspan="3"| Client
  | Target
+
  | Window ID
 
  | VarInt
 
  | VarInt
  |  
+
  | A unique id number for the window to be displayed. Notchian server implementation is a counter, starting at 1.
 
  |-
 
  |-
  | Type
+
  | Window Type
 
  | VarInt
 
  | VarInt
  | 0: interact, 1: attack, 2: interact at
+
  | The window type to use for display. Contained in the <code>minecraft:menu</code> regisry; see [[Inventory]] for the different values.
 
  |-
 
  |-
  | Target X
+
  | Window Title
  | Optional Float
+
  | [[Chat]]
  | Only if Type is interact at
+
  | The title of the window
|-
 
| Target Y
 
| Optional Float
 
| Only if Type is interact at
 
|-
 
| Target Z
 
| Optional Float
 
| Only if Type is interact at
 
 
  |}
 
  |}
  
==== Player ====
+
==== Open Sign Editor ====
  
This packet is used to indicate whether the player is on ground (walking/swimming), or airborne (jumping/falling).
+
Sent when the client has placed a sign and is allowed to send [[#Update Sign|Update Sign]].  There must already be a sign at the given location (which the client does not do automatically) - send a [[#Block Change|Block Change]] first.
 
 
When dropping from sufficient height, fall damage is applied when this state goes from false to true. The amount of damage applied is based on the point where it last changed from true to false. Note that there are several movement related packets containing this state.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,485: Line 3,569:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x03
+
  |rowspan="1"| 0x30
 
  |rowspan="1"| Play
 
  |rowspan="1"| Play
  |rowspan="1"| Server
+
  |rowspan="1"| Client
  | On Ground
+
  | Location
  | Boolean
+
  | Position
  | True if the client is on the ground, false otherwise
+
  |  
 
  |}
 
  |}
  
==== Player Position ====
+
==== Craft Recipe Response ====
 
 
Updates the player's XYZ position on the server.
 
 
 
If the distance between the last known position of the player on the server and the new position set by this packet is greater than 100 units, this will result in the client being kicked for “You moved too quickly :( (Hacking?)”
 
  
If the distance is greater than 10 units, the server will log the warning message "<name> moved too quickly!", followed by two coordinate triples (maybe movement delta?), but will not kick the client.
+
Response to the serverbound packet ([[#Craft Recipe Request|Craft Recipe Request]]), with the same recipe ID. Appears to be used to notify the UI.
 
 
Also if the fixed-point number of X or Z is set greater than 3.2×10<sup>7</sup> the client will be kicked for “Illegal position”.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,511: Line 3,589:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="4"| 0x04
+
  |rowspan="2"| 0x31
  |rowspan="4"| Play
+
  |rowspan="2"| Play
  |rowspan="4"| Server
+
  |rowspan="2"| Client
  | X
+
  | Window ID
  | Double
+
  | Byte
  | Absolute position
+
  |
 
  |-
 
  |-
  | Feet Y
+
  | Recipe
  | Double
+
  | Identifier
  | Absolute position, normally Head Y - 1.62
+
  | A recipe ID
|-
 
| Z
 
| Double
 
| Absolute position
 
|-
 
| On Ground
 
| Boolean
 
| True if the client is on the ground, false otherwise
 
 
  |}
 
  |}
  
==== Player Look ====
+
==== Player Abilities (clientbound) ====
[[File:Minecraft-trig-yaw.png|thumb|The unit circle for yaw]]
 
[[File:Yaw.png|thumb|The unit circle of yaw, redrawn]]
 
  
Updates the direction the player is looking in.
+
The latter 2 floats are used to indicate the field of view and flying speed respectively, while the first byte is used to determine the value of 4 booleans.
 
 
Yaw is measured in degrees, and does not follow classical trigonometry rules. The unit circle of yaw on the XZ-plane starts at (0, 1) and turns counterclockwise, with 90 at (-1, 0), 180 at (0,-1) and 270 at (1, 0). Additionally, yaw is not clamped to between 0 and 360 degrees; any number is valid, including negative numbers and numbers greater than 360.
 
 
 
Pitch is measured in degrees, where 0 is looking straight ahead, -90 is looking straight up, and 90 is looking straight down.
 
 
 
The yaw of player (in degrees), standing at point (x0, z0) and looking towards point (x, z) one can be calculated with:
 
 
 
l = x-x0
 
w = z-z0
 
c = sqrt( l*l + w*w )
 
alpha1 = -arcsin(l/c)/PI*180
 
alpha2 =  arccos(w/c)/PI*180
 
if alpha2 > 90 then
 
    yaw = 180 - alpha1
 
else
 
    yaw = alpha1
 
 
 
You can get a unit vector from a given yaw/pitch via:
 
 
 
x = -cos(pitch) * sin(yaw)
 
y = -sin(pitch)
 
z =  cos(pitch) * cos(yaw)
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,567: Line 3,613:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x05
+
  |rowspan="3"| 0x32
 
  |rowspan="3"| Play
 
  |rowspan="3"| Play
  |rowspan="3"| Server
+
  |rowspan="3"| Client
  | Yaw
+
  | Flags
 +
| Byte
 +
| Bit field, see below
 +
|-
 +
| Flying Speed
 
  | Float
 
  | Float
  | Absolute rotation on the X Axis, in degrees
+
  | 0.05 by default
 
  |-
 
  |-
  | Pitch
+
  | Field of View Modifier
 
  | Float
 
  | Float
  | Absolute rotation on the Y Axis, in degrees
+
  | Modifies the field of view, like a speed potion. A Notchian server will use the same value as the movement speed sent in the [[#Entity_Properties|Entity Properties]] packet, which defaults to 0.1 for players.
|-
 
| On Ground
 
| Boolean
 
| True if the client is on the ground, False otherwise
 
 
  |}
 
  |}
  
==== Player Position And Look ====
+
About the flags:
 
 
A combination of [[#Player Look|Player Look]] and [[#Player Position|Player Position]].
 
  
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="6"| 0x06
+
  ! Field
|rowspan="6"| Play
+
  ! Bit
  |rowspan="6"| Server
+
  |-
  | X
+
  | Invulnerable
  | Double
+
  | 0x01
  | Absolute position
 
 
  |-
 
  |-
  | Feet Y
+
  | Flying
  | Double
+
  | 0x02
| Absolute feet position, normally Head Y - 1.62
 
 
  |-
 
  |-
  | Z
+
  | Allow Flying
  | Double
+
  | 0x04
| Absolute position
 
 
  |-
 
  |-
  | Yaw
+
  | Creative Mode (Instant Break)
  | Float
+
  | 0x08
| Absolute rotation on the X Axis, in degrees
 
|-
 
| Pitch
 
| Float
 
| Absolute rotation on the Y Axis, in degrees
 
|-
 
| On Ground
 
| Boolean
 
| True if the client is on the ground, false otherwise
 
 
  |}
 
  |}
  
==== Player Digging ====
+
==== Combat Event ====
  
Sent when the player mines a block. A Notchian server only accepts digging packets with coordinates within a 6-unit radius of the player's position.
+
Originally used for metadata for twitch streaming circa 1.8. Now only used to display the game over screen (with enter combat and end combat completely ignored by the Notchain client)
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,631: Line 3,657:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x07
+
  |rowspan="8"| 0x33
  |rowspan="3"| Play
+
  |rowspan="8"| Play
  |rowspan="3"| Server
+
  |rowspan="8"| Client
  | Status
+
  |colspan="2"| Event
  | Byte
+
  | VarInt Enum
  | The action the player is taking against the block (see below)
+
  | Determines the layout of the remaining packet
 
  |-
 
  |-
  | Location
+
  ! Event
  | Position
+
  ! Field Name
  | Block position
+
  !
 +
!
 
  |-
 
  |-
  | Face
+
  | 0: enter combat
  | Byte
+
  | ''no fields''
  | The face being hit (see below)
+
  | ''no fields''
  |}
+
  |  
 
 
Status can (currently) be one of six values:
 
 
 
{| class="wikitable"
 
! Meaning
 
! Value
 
 
  |-
 
  |-
  | Started digging
+
  |rowspan="2"| 1: end combat
  | <code>0</code>
+
| Duration
 +
| VarInt
 +
  | Length of the combat in ticks.
 
  |-
 
  |-
  | Cancelled digging
+
  | Entity ID
  | <code>1</code>
+
  | Int
 +
| ID of the primary opponent of the ended combat, or -1 if there is no obvious primary opponent.
 
  |-
 
  |-
  | Finished digging
+
  |rowspan="3"| 2: entity dead
  | <code>2</code>
+
  | Player ID
 +
| VarInt
 +
| Entity ID of the player that died (should match the client's entity ID).
 
  |-
 
  |-
  | Drop item stack
+
  | Entity ID
  | <code>3</code>
+
  | Int
 +
| The killing entity's ID, or -1 if there is no obvious killer.
 
  |-
 
  |-
  | Drop item
+
  | Message
  | <code>4</code>
+
  | [[Chat]]
  |-
+
  | The death message
| Shoot arrow / finish eating
 
| <code>5</code>
 
 
  |}
 
  |}
  
Notchian clients send a 0 (started digging) when they start digging and a 2 (finished digging) once they think they are finished. If digging is aborted, the client simply send a 1 (cancel digging).
+
==== Player Info ====
 
 
Status code 4 (drop item) is a special case. In-game, when you use the Drop Item command (keypress 'q'), a dig packet with a status of 4, and all other values set to 0, is sent from client to server. Status code 3 is similar, but drops the entire stack.
 
 
 
Status code 5 (shoot arrow / finish eating) is also a special case. The x, y and z fields are all set to 0 like above, with the exception of the face field, which is set to 255.
 
  
The face can be one of six values, representing the face being hit:
+
Sent by the server to update the user list (<tab> in the client).
  
 
{| class="wikitable"
 
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
!colspan="4"| Field Name
 +
!colspan="3"| Field Type
 +
! Notes
 
  |-
 
  |-
  ! Value
+
  |rowspan="19"| 0x34
  | 0
+
  |rowspan="19"| Play
  | 1
+
  |rowspan="19"| Client
  | 2
+
  |colspan="4"| Action
  | 3
+
  |colspan="3"| VarInt
| 4
+
  | Determines the rest of the Player format after the UUID
  | 5
 
 
  |-
 
  |-
! Offset
+
  |colspan="4"| Number Of Players
  | -Y
+
  |colspan="3"| VarInt
| +Y
+
  | Number of elements in the following array
  | -Z
 
| +Z
 
| -X
 
| +X
 
  |}
 
 
 
==== Player Block Placement ====
 
 
 
{| class="wikitable"
 
 
  |-
 
  |-
  ! Packet ID
+
  |rowspan="17"| Player
  ! State
+
  |colspan="3"| UUID
  ! Bound To
+
  |rowspan="17"| Array
  ! Field Name
+
  |colspan="2"| UUID
  ! Field Type
+
  |
! Notes
 
 
  |-
 
  |-
  |rowspan="6"| 0x08
+
  ! Action
  |rowspan="6"| Play
+
  !colspan="2"| Field Name
  |rowspan="6"| Server
+
  !colspan="2"|  
| Location
+
  !
  | Position
 
| Block position
 
 
  |-
 
  |-
  | Face
+
  |rowspan="10"| 0: add player
| Byte
+
  |colspan="2"| Name
  | The face on which the block is placed (see above)
+
  |colspan="2"| String (16)
|-
 
  | Held Item
 
| [[Slot Data|Slot]]
 
 
  |  
 
  |  
 
  |-
 
  |-
  | Cursor Position X
+
  |colspan="2"| Number Of Properties
  | Byte
+
  |colspan="2"| VarInt
  | The position of the crosshair on the block
+
  | Number of elements in the following array
 
  |-
 
  |-
  | Cursor Position Y
+
  |rowspan="4"| Property
  | Byte
+
| Name
 +
|rowspan="4"| Array
 +
  | String (32767)
 
  |  
 
  |  
 
  |-
 
  |-
  | Cursor Position Z
+
  | Value
  | Byte
+
  | String (32767)
 +
|
 +
|-
 +
| Is Signed
 +
| Boolean
 
  |  
 
  |  
|}
 
 
In normal operation (i.e. placing a block), this packet is sent once, with the values set normally.
 
 
This packet has a special case where X, Y, Z, and Face are all -1. (Note that Y is unsigned so set to 255.) This special packet indicates that the currently held item for the player should have its state updated such as eating food, pulling back bows, using buckets, etc.
 
 
In a Notchian Beta client, the block or item ID corresponds to whatever the client is currently holding, and the client sends one of these packets any time a right-click is issued on a surface, so no assumptions can be made about the safety of the ID. However, with the implementation of server-side inventory, a Notchian server seems to ignore the item ID, instead operating on server-side inventory information and holding selection. The client has been observed (1.2.5 and 1.3.2) to send both real item IDs and -1 in a single session.
 
 
Special note on using buckets: When using buckets, the Notchian client might send two packets: first a normal and then a special case. The first normal packet is sent when you're looking at a block (e.g. the water you want to scoop up). This normal packet does not appear to do anything with a Notchian server. The second, special case packet appears to perform the action — based on current position/orientation and with a distance check — it appears that buckets can only be used within a radius of 6 units.
 
 
==== Held Item Change ====
 
 
Sent when the player changes the slot selection
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="1"| 0x09
+
  | Signature
  |rowspan="1"| Play
+
| Optional String (32767)
  |rowspan="1"| Server
+
| Only if Is Signed is true
  | Slot
+
|-
  | Short
+
|colspan="2"| Gamemode
  | The slot which the player has selected (0–8)
+
|colspan="2"| VarInt
 +
|
 +
|-
 +
|colspan="2"| Ping
 +
|colspan="2"| VarInt
 +
| Measured in milliseconds
 +
|-
 +
|colspan="2"| Has Display Name
 +
|colspan="2"| Boolean
 +
|
 +
|-
 +
|colspan="2"| Display Name
 +
|colspan="2"| Optional [[Chat]]
 +
| Only if Has Display Name is true
 +
|-
 +
| 1: update gamemode
 +
|colspan="2"| Gamemode
 +
|colspan="2"| VarInt
 +
|
 +
|-
 +
| 2: update latency
 +
|colspan="2"| Ping
 +
|colspan="2"| VarInt
 +
| Measured in milliseconds
 +
|-
 +
  |rowspan="2"| 3: update display name
 +
|colspan="2"| Has Display Name
 +
|colspan="2"| Boolean
 +
|
 +
|-
 +
|colspan="2"| Display Name
 +
  |colspan="2"| Optional [[Chat]]
 +
  | Only send if Has Display Name is true
 +
  |-
 +
  | 4: remove player
 +
|colspan="2"| ''no fields''
 +
|colspan="2"| ''no fields''
 +
|
 
  |}
 
  |}
  
==== Animation ====
+
The Property field looks as in the response of [[Mojang API#UUID -> Profile + Skin/Cape]], except of course using the protocol format instead of JSON. That is, each player will usually have one property with Name “textures” and Value being a base64-encoded JSON string as documented at [[Mojang API#UUID -> Profile + Skin/Cape]]. An empty properties array is also acceptable, and will cause clients to display the player with one of the two default skins depending on UUID.
 +
 
 +
Ping values correspond with icons in the following way:
 +
* A ping that negative (i.e. not known to the server yet) will result in the no connection icon.
 +
* A ping under 150 milliseconds will result in 5 bars
 +
* A ping under 300 milliseconds will result in 4 bars
 +
* A ping under 600 milliseconds will result in 3 bars
 +
* A ping under 1000 milliseconds (1 second) will result in 2 bars
 +
* A ping greater than or equal to 1 second will result in 1 bar.
 +
 
 +
==== Face Player ====
  
Sent when the player's arm swings
+
Used to rotate the client player to face the given location or entity (for <code>/teleport [<targets>] <x> <y> <z> facing</code>).
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,782: Line 3,825:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x0A
+
  |rowspan="8"| 0x35
  |rowspan="1"| Play
+
  |rowspan="8"| Play
  |rowspan="1"| Server
+
  |rowspan="8"| Client
  |colspan="3"| ''no fields''
+
|-
  |}
+
| Feet/eyes
 +
  | VarInt enum
 +
| Values are feet=0, eyes=1.  If set to eyes, aims using the head position; otherwise aims using the feet position.
 +
|-
 +
| Target x
 +
| Double
 +
| x coordinate of the point to face towards
 +
|-
 +
| Target y
 +
| Double
 +
| y coordinate of the point to face towards
 +
|-
 +
| Target z
 +
| Double
 +
| z coordinate of the point to face towards
 +
|-
 +
| Is entity
 +
| Boolean
 +
| If true, additional information about an entity is provided.
 +
|-
 +
| Entity ID
 +
| Optional VarInt
 +
| Only if is entity is true &mdash; the entity to face towards
 +
|-
 +
| Entity feet/eyes
 +
| Optional VarInt enum
 +
| Whether to look at the entity's eyes or feet.  Same values and meanings as before, just for the entity's head/feet.
 +
  |}
  
==== Entity Action ====
+
If the entity given by entity ID cannot be found, this packet should be treated as if is entity was false.
 +
 
 +
==== Player Position And Look (clientbound) ====  
 +
 
 +
Updates the player's position on the server. This packet will also close the “Downloading Terrain” screen when joining/respawning.
 +
 
 +
If the distance between the last known position of the player on the server and the new position set by this packet is greater than 100 meters, the client will be kicked for “You moved too quickly :( (Hacking?)”.
 +
 
 +
Also if the fixed-point number of X or Z is set greater than <code>3.2E7D</code> the client will be kicked for “Illegal position”.
 +
 
 +
Yaw is measured in degrees, and does not follow classical trigonometry rules. The unit circle of yaw on the XZ-plane starts at (0, 1) and turns counterclockwise, with 90 at (-1, 0), 180 at (0, -1) and 270 at (1, 0). Additionally, yaw is not clamped to between 0 and 360 degrees; any number is valid, including negative numbers and numbers greater than 360.
  
Sent at least when crouching, leaving a bed, or sprinting. To send action animation to client use 0x28. The client will send this with Action ID = 3 when “Leave Bed” is clicked.
+
Pitch is measured in degrees, where 0 is looking straight ahead, -90 is looking straight up, and 90 is looking straight down.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 3,800: Line 3,880:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x0B
+
  |rowspan="7"| 0x36
  |rowspan="3"| Play
+
  |rowspan="7"| Play
  |rowspan="3"| Server
+
  |rowspan="7"| Client
  | Entity ID
+
  | X
  | VarInt
+
  | Double
  | Player ID
+
  | Absolute or relative position, depending on Flags
 +
|-
 +
| Y
 +
| Double
 +
| Absolute or relative position, depending on Flags
 
  |-
 
  |-
  | Action ID
+
  | Z
  | VarInt
+
  | Double
  | The ID of the action, see below
+
  | Absolute or relative position, depending on Flags
 
  |-
 
  |-
  | Jump Boost
+
  | Yaw
  | VarInt
+
| Float
  | Horse jump boost. Ranged from 0 -> 100.
+
| Absolute or relative rotation on the X axis, in degrees