Difference between revisions of "Pre-release protocol"

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This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently 1.6.2, protocol 74) to the current pre-release. Note that this page contains bleeding-edge information that may not be completely or correctly documented.
+
This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently [[Protocol version numbers|1.16.5, protocol 754]]) to the current pre-release (currently [[Protocol version numbers|21w07a, protocol {{Snapshot PVN|1073741839}}]]). Note that this page contains bleeding-edge information that may not be completely or correctly documented.
He who wishes to commandeer the merging of this into [[Protocol]] when an update is made must be sure to respect any changes that may have occured to the respective packets there.
 
  
== Protocol History ==
+
One who wishes to commandeer the merging of this into [[Protocol]] when an update is made must be sure to respect any changes that may have occurred to the respective packets there.
=== 13w36a ===
 
* Added sound category byte to 0x3E
 
* Changed 0xC8 to a string:int map
 
  
=== 13w37b ===  
+
== Contents ==
  
=== 1.6.3 ===
+
<div style="float:right;">__TOC__</div>
* Terrain fixes to help moving to 1.7, no packet changes from 1.6.2
 
  
=== 1.6.4 ===
+
=== Data types ===
  
=== 13w38a/b/c ===
+
No changes so far.
  
=== 13w39a/b ===
+
=== Packets ===
* UUIDs added to spawn named entity
 
* Game state 'gamemode' byte -> float
 
  
=== 13w41a ===  
+
{| class="wikitable"
* Large protocol rework
+
! ID
 
+
! Packet name
=== 13w41b ===  
+
!colspan="2"| Documentation
''Note this isn't backwards compatible with 13w41a due to Handshakes's Server Port type change''
+
|-
* Removed Player (Clientbound), Player Position (Clientbound), Player Look (Clientbound)
+
!colspan="4"| Play clientbound
* Removed Player Position and Look (Clientbound)'s 'Stance' 
+
{{PacketList|0x05|Sculk Vibration Signal|rel=added}}
* Removed Join Game's 'N/A' and 'Level Type'
+
{{PacketList|{{change|0x05|0x06}}|Entity Animation (clientbound)|pre=unchanged}}
* Changed Join Game's 'Gamemode' 'Difficulty' 'Max Players' types to Unsigned Byte
+
{{PacketList|{{change|0x06|0x07}}|Statistics|pre=unchanged}}
* Changed Handshake's 'Server Port' type to Unsigned Short
+
{{PacketList|{{change|0x07|0x08}}|Acknowledge Player Digging|pre=unchanged}}
* Removed Respawn's 'World Height' 'Level Type'
+
{{PacketList|{{change|0x08|0x09}}|Block Break Animation|pre=unchanged}}
* Changed Respawn's 'Difficulty' and 'Gamemode' types to Unsigned Byte
+
{{PacketList|{{change|0x09|0x0A}}|Block Entity Data|pre=unchanged}}
* Changed Held Item Change's 'Slot' type to Byte
+
{{PacketList|{{change|0x0A|0x0B}}|Block Action|pre=unchanged}}
* Removed Use Bed's 'unknown byte'
+
{{PacketList|{{change|0x0B|0x0C}}|Block Change|pre=unchanged}}
* Changed Animation's 'Animation' type to Unsigned Byte
+
{{PacketList|{{change|0x0C|0x0D}}|Boss Bar|pre=unchanged}}
* Changed Animation's 'Entity ID' type to VarInt
+
{{PacketList|{{change|0x0D|0x0E}}|Server Difficulty|pre=unchanged}}
* Changed Spawn Player's 'Entity ID' type to VarInt
+
{{PacketList|{{change|0x0E|0x0F}}|Chat Message (clientbound)|pre=unchanged}}
* Changed Spawn Object's 'Entity ID' type to VarInt
+
{{PacketList|0x10|Clear Titles|rel=added}}
* Changed Spawn Mob's 'Entity ID' type to VarInt
+
{{PacketList|{{change|0x0F|0x11}}|Tab-Complete (clientbound)|pre=unchanged}}
* Changed Spawn Painting's 'Entity ID' type to VarInt
+
{{PacketList|{{change|0x10|0x12}}|Declare Commands|pre=unchanged}}
* Changed Spawn Experience Orb's 'Entity ID' type to VarInt
+
{{PacketList|0x11|Window Confirmation (clientbound)|pre=removed}}
* Changed Multi Block Change's 'Chunk X' and 'Chunk Z' types to VarInt
+
{{PacketList|{{change|0x12|0x13}}|Close Window (clientbound)|pre=unchanged}}
* Changed Block Change's 'Block Type' type to VarInt
+
{{PacketList|{{change|0x13|0x14}}|Window Items|pre=unchanged}}
* Changed Block Action's 'Block Type' type to VarInt
+
{{PacketList|{{change|0x14|0x15}}|Window Property|pre=unchanged}}
* Changed Block Break Animation's 'Entity ID' type to VarInt
+
{{PacketList|{{change|0x15|0x16}}|Set Slot|pre=unchanged}}
* Changed Explosion's 'X' 'Y' and 'Z' types to Float
+
{{PacketList|{{change|0x16|0x17}}|Set Cooldown|pre=unchanged}}
* Changed Change Game State's 'Reason' type to Unsigned Byte
+
{{PacketList|{{change|0x17|0x18}}|Plugin Message (clientbound)|pre=unchanged}}
* Changed Spawn Global Entity's 'Entity ID' type to VarInt
+
{{PacketList|{{change|0x18|0x19}}|Named Sound Effect|pre=unchanged}}
* Changed Close Window's 'Window ID' type to Unsigned Byte
+
{{PacketList|{{change|0x19|0x1A}}|Disconnect (play)|pre=unchanged}}
* Changed Set Slot's 'Window ID' type to Unsigned Byte
+
{{PacketList|{{change|0x1A|0x1B}}|Entity Status|pre=unchanged}}
* Changed Window Items's 'Window ID' type to Unsigned Byte
+
{{PacketList|{{change|0x1B|0x1C}}|Explosion|pre=unchanged}}
* Changed Window Property's 'Window ID' type to Unsigned Byte
+
{{PacketList|{{change|0x1C|0x1D}}|Unload Chunk|pre=unchanged}}
* Changed Comfirm Transaction's 'Window ID' type to Unsigned Byte
+
{{PacketList|{{change|0x1D|0x1E}}|Change Game State|pre=unchanged}}
* Changed Maps' 'Item Damage' type to VarInt
+
{{PacketList|{{change|0x1E|0x1F}}|Open Horse Window|pre=unchanged}}
* Removed Maps' 'Item Type'
+
{{PacketList|0x20|Initialize World Border|rel=added}}
* Changed Update Block Entity's 'Action' type to Unsigned Byte
+
{{PacketList|{{change|0x1F|0x21}}|Keep Alive (clientbound)|pre=unchanged}}
* Block Editor Open -> Sign Editor Open
+
{{PacketList|{{change|0x20|0x22}}|Chunk Data}}
* Removed Sign Editor Open's 'Tile Entity Id'
+
{{PacketList|{{change|0x21|0x23}}|Effect|pre=unchanged}}
* Changed Statistics's 'Count' and 'Amount' types to VarInt
+
{{PacketList|{{change|0x22|0x24}}|Particle|pre=unchanged}}
* Changed Tab-Complete from \x00 String to Array of Strings
+
{{PacketList|{{change|0x23|0x25}}|Update Light}}
 
+
{{PacketList|{{change|0x24|0x26}}|Join Game|pre=unchanged}}
== Protocol Version ==
+
{{PacketList|{{change|0x25|0x27}}|Map Data}}
13w41b - 0 ''Note this isn't backwards compatible with 13w41a due to Handshakes's Server Port type change''
+
{{PacketList|{{change|0x26|0x28}}|Trade List|pre=unchanged}}
 
+
{{PacketList|{{change|0x27|0x29}}|Entity Position|pre=unchanged}}
13w41a - 0
+
{{PacketList|{{change|0x28|0x2A}}|Entity Position and Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x29|0x2B}}|Entity Rotation|pre=unchanged}}
 +
{{PacketList|0x2A|Entity Movement|pre=removed}}
 +
{{PacketList|{{change|0x2B|0x2C}}|Vehicle Move (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x2C|0x2D}}|Open Book|pre=unchanged}}
 +
{{PacketList|{{change|0x2D|0x2E}}|Open Window|pre=unchanged}}
 +
{{PacketList|{{change|0x2E|0x2F}}|Open Sign Editor|pre=unchanged}}
 +
{{PacketList|{{change|0x2F|0x30}}|Craft Recipe Response|pre=unchanged}}
 +
{{PacketList|{{change|0x30|0x31}}|Player Abilities (clientbound)|pre=unchanged}}
 +
{{PacketList|0x31|Combat Event|pre=removed}}
 +
{{PacketList|0x32|End Combat Event|rel=added}}
 +
{{PacketList|0x33|Enter Combat Event|rel=added}}
 +
{{PacketList|0x34|Death Combat Event|rel=added}}
 +
{{PacketList|{{change|0x32|0x35}}|Player Info|pre=unchanged}}
 +
{{PacketList|{{change|0x33|0x36}}|Face Player|pre=unchanged}}
 +
{{PacketList|0x36|Destroy Entities}}|rel=removed}}
 +
{{PacketList|{{change|0x34|0x37}}|Player Position And Look (clientbound)}}
 +
{{PacketList|{{change|0x35|0x38}}|Unlock Recipes|pre=unchanged}}
 +
{{PacketList|0x39|Destroy Entity}}|rel=added}}
 +
{{PacketList|{{change|0x37|0x3A}}|Remove Entity Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x38|0x3B}}|Resource Pack Send}}
 +
{{PacketList|{{change|0x39|0x3C}}|Respawn|pre=unchanged}}
 +
{{PacketList|{{change|0x3A|0x3D}}|Entity Head Look|pre=unchanged}}
 +
{{PacketList|{{change|0x3B|0x3E}}|Multi Block Change|pre=unchanged}}
 +
{{PacketList|{{change|0x3C|0x3F}}|Select Advancement Tab|pre=unchanged}}
 +
{{PacketList|0x40|Action Bar|rel=added}}
 +
{{PacketList|0x41|World Border Center|rel=added}}
 +
{{PacketList|0x42|World Border Lerp Size|rel=added}}
 +
{{PacketList|0x43|World Border Size |rel=added}}
 +
{{PacketList|0x44|World Border Warning Delay|rel=added}}
 +
{{PacketList|0x45|World Border Warning Reach|rel=added}}
 +
{{PacketList|{{change|0x3E|0x46}}|Camera|pre=unchanged}}
 +
{{PacketList|{{change|0x3F|0x47}}|Held Item Change (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x40|0x48}}|Update View Position|pre=unchanged}}
 +
{{PacketList|{{change|0x41|0x49}}|Update View Distance|pre=unchanged}}
 +
{{PacketList|{{change|0x42|0x4A}}|Spawn Position|pre=unchanged}}
 +
{{PacketList|{{change|0x43|0x4B}}|Display Scoreboard|pre=unchanged}}
 +
{{PacketList|{{change|0x44|0x4C}}|Entity Metadata|pre=unchanged}}
 +
{{PacketList|{{change|0x45|0x4D}}|Attach Entity|pre=unchanged}}
 +
{{PacketList|{{change|0x46|0x4E}}|Entity Velocity|pre=unchanged}}
 +
{{PacketList|{{change|0x47|0x4F}}|Entity Equipment|pre=unchanged}}
 +
{{PacketList|0x4F|Title|rel=removed}}
 +
{{PacketList|{{change|0x48|0x50}}|Set Experience|pre=unchanged}}
 +
{{PacketList|{{change|0x49|0x51}}|Update Health|pre=unchanged}}
 +
{{PacketList|{{change|0x4A|0x52}}|Scoreboard Objective|pre=unchanged}}
 +
{{PacketList|{{change|0x4B|0x53}}|Set Passengers|pre=unchanged}}
 +
{{PacketList|{{change|0x4C|0x54}}|Teams|pre=unchanged}}
 +
{{PacketList|{{change|0x4D|0x55}}|Update Score|pre=unchanged}}
 +
{{PacketList|0x56|Set Title SubTitle|rel=added}}
 +
{{PacketList|0x57|Time Update|pre=unchanged}}
 +
{{PacketList|0x58|Set Title Text|rel=added}}
 +
{{PacketList|0x59|Set Title Time|rel=added}}
 +
{{PacketList|{{change|0x50|0x5A}}|Entity Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x51|0x5B}}|Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x52|0x5C}}|Stop Sound|pre=unchanged}}
 +
{{PacketList|{{change|0x53|0x5D}}|Player List Header And Footer|pre=unchanged}}
 +
{{PacketList|{{change|0x54|0x5E}}|NBT Query Response|pre=unchanged}}
 +
{{PacketList|{{change|0x55|0x5F}}|Collect Item|pre=unchanged}}
 +
{{PacketList|{{change|0x56|0x60}}|Entity Teleport|pre=unchanged}}
 +
{{PacketList|{{change|0x57|0x61}}|Advancements|pre=unchanged}}
 +
{{PacketList|{{change|0x58|0x62}}|Entity Properties|pre=unchanged}}
 +
{{PacketList|{{change|0x59|0x63}}|Entity Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x5A|0x64}}|Declare Recipes|pre=unchanged}}
 +
{{PacketList|{{change|0x5B|0x65}}|Tags}}
 +
|-
 +
!colspan="4"| Play serverbound
 +
{{PacketList|0x05|Client Settings}}
 +
|-
 +
!colspan="4"| Handshaking serverbound
 +
{{PacketList|0x00|Handshake}}
 +
|}
  
13w39a/b - 80
+
== New/modified data types ==
  
13w38a/b/c - 79
+
No changes so far.
  
1.6.4 - 78
+
== Entity Metadata ==
  
1.6.3 - 77
+
{{#vardefine:meta_prerelease|1}}
  
13w37b - 76
+
{{Warning2|Note that other entities have had metadata shifts due to these changes, not shown here.}}
  
13w36a - 75
+
=== Entity ===
  
== Packet format ==
+
{{metadata inherit|Entity}}
  
 
{| class="wikitable"
 
{| class="wikitable"
! Field Name !! Field Type !! Notes
+
! Index
|-
+
! Type
| Length || VarInt || Includes the type's length
+
!style="width: 250px;" colspan="2"| Meaning
|-
+
! Default
| Type || VarInt ||
+
|-
|-
+
|rowspan="9"| {{Metadata id|}}
| Data || ||
+
|rowspan="9"| Byte
|}
+
! Bit mask
 +
! Meaning
 +
|rowspan="9"| 0
 +
|-
 +
| 0x01
 +
| Is on fire
 +
|-
 +
| 0x02
 +
| Is crouching
 +
|-
 +
| 0x04
 +
| Unused (previously riding)
 +
|-
 +
| 0x08
 +
| Is sprinting
 +
|-
 +
| 0x10
 +
| Is swimming
 +
|-
 +
| 0x20
 +
| Is invisible
 +
|-
 +
| 0x40
 +
| has glowing effect
 +
|-
 +
| 0x80
 +
| Is flying with an {{Minecraft Wiki|elytra}}
 +
|-
 +
| {{Metadata id|}}
 +
| VarInt
 +
|colspan="2"| Air ticks
 +
| 300
 +
|-
 +
| {{Metadata id|}}
 +
| OptChat
 +
|colspan="2"| Custom name
 +
| empty
 +
|-
 +
| {{Metadata id|}}
 +
| Boolean
 +
|colspan="2"| Is custom name visible
 +
| false
 +
|-
 +
| {{Metadata id|}}
 +
| Boolean
 +
|colspan="2"| Is silent
 +
| false
 +
|-
 +
| {{Metadata id|}}
 +
| Boolean
 +
|colspan="2"| Has no gravity
 +
| false
 +
|-
 +
| {{Metadata id|}}
 +
| Pose
 +
|colspan="2"| Pose
 +
| STANDING
 +
|- {{added}}
 +
| {{Metadata id|added}}
 +
| VarInt
 +
|colspan="2"| Ticks frozen in powdered snow
 +
| 0
 +
|}
  
== Data Types ==
+
== Block Actions ==
  
VarInt - [http://developers.google.com/protocol-buffers/docs/encoding#varints Protocol Buffer 32-bit Varint]
+
No changes so far.
  
String - UTF-8 String prefixed with a VarInt
+
== Inventories ==
  
Metadata - Strings are now UTF-8 too
+
No changes so far.
  
== Handshaking ==
+
== Plugin Channels ==
 
 
=== Serverbound ===
 
  
==== Handshake ====
+
No changes so far.
This causes the server to switch into the target state.
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=4 | 0x00
 
| Protocol Version || VarInt ||
 
|-
 
| Server Address (hostname or IP) || String || localhost
 
|-
 
| Server Port || Unsigned Short|| 25565
 
|-
 
| Current state || VarInt || 1 for status, 2 for login
 
|}
 
  
 
== Play ==
 
== Play ==
Line 121: Line 231:
 
=== Clientbound ===
 
=== Clientbound ===
  
==== Keep Alive ====
+
==== Sculk Vibration Signal ====
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=1 | 0x00
 
| Keep Alive ID || Int ||
 
|}
 
  
 +
{| class="wikitable" {{Added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
|rowspan="4"| 0x05
 +
|rowspan="4"| Play
 +
|rowspan="4"| Client
 +
| Source Position
 +
| Position
 +
| Source position for the vibration.
 +
|-
 +
| Destination Identifier
 +
| Identifier
 +
| Identifier of the destination codec type.
 +
|-
 +
| Destination
 +
| Varies
 +
| Vanilla default destinations are a block position encoded as a [https://wiki.vg/Protocol#Data_types Position] for "block" or an entity id encoded as a VarInt for "entity".
 +
|-
 +
| Arrival Ticks
 +
| VarInt
 +
| Ticks for the signal to arrive at the destination.
 +
|}
 +
This packet shows a permanent particle.
  
==== Join Game ====
+
==== Clear Titles====
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=5 | 0x01
 
| Entity ID || Int || The player's Entity ID
 
|-
 
| Gamemode || Unsigned Byte || 0: survival, 1: creative, 2: adventure. Bit 3 (0x8) is the hardcore flag
 
|-
 
| Dimension || Byte || -1: nether, 0: overworld, 1: end
 
|-
 
| Difficulty || Unsigned Byte || 0 thru 3 for Peaceful, Easy, Normal, Hard
 
|-
 
| Max Players || Unsigned Byte || Used by the client to draw the player list
 
|}
 
  
==== Chat Message ====
+
{| class="wikitable" {{Added}}
{| class="wikitable"
+
! Packet ID
! Packet ID !! Field Name !! Field Type !! Notes
+
! State
|-
+
! Bound To
| rowspan=1 | 0x02
+
! Field Name
| JSON Data || String || https://gist.github.com/thinkofdeath/e882ce057ed83bac0a1c
+
! Field Type
|}
+
! Notes
 +
|- {{ Added }}
 +
|rowspan="4"| 0x10
 +
|rowspan="4"| Play
 +
|rowspan="4"| Client
 +
|- {{ Added }}
 +
| Reset
 +
| Boolean
 +
|
 +
|-
 +
|}
  
==== Time Update ====
+
==== Initialize World Border ====  
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=2 | 0x03
 
| Age of the world || Long || 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 ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan=3 | 0x04
+
! Bound To
| EntityID || Int || Entity's ID
+
! Field Name
|-
+
! Field Type
| Slot || Short || Equipment slot: 0=held, 1-4=armor slot (1 - boots, 2 - leggings, 3 - chestplate, 4 - helmet)
+
! Notes
|-
+
|- {{ Added }}
| Item || [[Slot_Data|Slot]] || Item in slot format
+
|rowspan="8"| 0x20
|}
+
|rowspan="8"| Play
 +
|rowspan="8"| Client
 +
| X
 +
| Double
 +
|  
 +
|- {{ Added }}
 +
| Z
 +
| Double
 +
|
 +
|- {{ Added }}
 +
| Old Diameter
 +
| Double
 +
| Current length of a single side of the world border, in meters.
 +
|- {{ Added }}
 +
| New Diameter
 +
| Double
 +
| Target length of a single side of the world border, in meters.
 +
|- {{ Added }}
 +
| Speed
 +
| VarLong
 +
| Number of real-time ''milli''seconds until New Diameter is reached. It appears that Notchian server does not sync world border speed to game ticks, so it gets out of sync with server lag. If the world border is not moving, this is set to 0.
 +
|- {{ Added }}
 +
| Portal Teleport Boundary
 +
| VarInt
 +
| Resulting coordinates from a portal teleport are limited to ±value. Usually 29999984.
 +
|- {{ Added }}
 +
| Warning Blocks
 +
| VarInt
 +
| In meters.
 +
|- {{ Added }}
 +
| Warning Time
 +
| VarInt
 +
| In seconds as set by <code>/worldborder warning time</code>.
 +
|- {{ Added }}
 +
|}
  
==== Spawn Position ====
+
The Notchian client determines how solid to display the warning by comparing to whichever is higher, the warning distance or whichever is lower, the distance from the current diameter to the target diameter or the place the border will be after warningTime seconds. In pseudocode:
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=3 | 0x05
 
| X || Int || Spawn X in block coordinates
 
|-
 
| Y || Int || Spawn Y in block coordinates
 
|-
 
| Z || Int || Spawn | in block coordinates
 
|}
 
  
==== Update Health ====
+
<syntaxhighlight lang="java">
{| class="wikitable"
+
distance = max(min(resizeSpeed * 1000 * warningTime, abs(targetDiameter - currentDiameter)), warningDistance);
! Packet ID !! Field Name !! Field Type !! Notes
+
if (playerDistance < distance) {
|-
+
    warning = 1.0 - playerDistance / distance;
| rowspan=3 | 0x06
+
} else {
| Health || Float || 0 or less = dead, 20 = full HP
+
    warning = 0.0;
|-
+
}
| Food || Short || 0 - 20
+
</syntaxhighlight>
|-
 
| Food Saturation || Float || Seems to vary from 0.0 to 5.0 in integer increments
 
|}
 
  
==== Respawn ====
+
==== Chunk Data ====
{| class="wikitable"
+
{{Main|Chunk Format}}
! Packet ID !! Field Name !! Field Type !! Notes
+
{{See also|#Unload Chunk}}
|-
 
| rowspan=3 | 0x07
 
| Dimension || Int || -1: The Nether, 0: The Overworld, 1: The End
 
|-
 
| Difficulty || Unsigned Byte || 0 thru 3 for Peaceful, Easy, Normal, Hard.
 
|-
 
| Gamemode || Unsigned Byte || 0: survival, 1: creative, 2: adventure. The hardcore flag is not included
 
|}
 
  
==== Player Position And Look ====
+
{{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)}}
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=6| 0x08
 
| X || Double || Absolute position
 
|-
 
| Y || Double || Absolute position
 
|-
 
| Z || Double || Absolute position
 
|-
 
| Yaw || Float || Absolute rotation on the X Axis, in degrees
 
|-
 
| Pitch || Float || Absolute rotation on the Y Axis, in degrees
 
|-
 
| On Ground || Bool || True if the client is on the ground, False otherwise
 
|}
 
  
==== Held Item Change ====
+
The server only sends skylight information for chunk pillars in the {{Minecraft Wiki|Overworld}}, it's up to the client to know in which dimension 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"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=1 | 0x09
 
| Slot || Byte || The slot which the player has selected (0-8)
 
|}
 
  
==== Use Bed ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan=5 | 0x0A
+
! Bound To
| Entity ID || Int || Player ID
+
! Field Name
|-
+
! Field Type
| X || Int || Bed headboard X as block coordinate
+
! Notes
|-
+
|-
| Y || Unsigned Byte || Bed headboard Y as block coordinate
+
|rowspan="13"| {{change|0x20|0x22}}
|-
+
|rowspan="13"| Play
| Z || Int || Bed headboard Z as block coordinate
+
|rowspan="13"| Client
|}
+
| Chunk X
 +
| Int
 +
| Chunk coordinate (block coordinate divided by 16, rounded down)
 +
|-
 +
| Chunk Z
 +
| Int
 +
| Chunk coordinate (block coordinate divided by 16, rounded down)
 +
|- {{removed}}
 +
| Full chunk
 +
| Boolean
 +
| See [[Chunk Format#Full chunk|Chunk Format]]
 +
|- {{removed}}
 +
| Primary Bit Mask
 +
| VarInt
 +
| 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).
 +
|- {{added}}
 +
| Bit Mask Length
 +
| VarInt
 +
| Length of the following array
 +
|- {{added}}
 +
| Primary Bit Mask
 +
| Array of Long
 +
| BitSet with bits (world height in blocks / 16) 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 the lowest y to 15 blocks above).
 +
|-
 +
| 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.
 +
|-
 +
| Biomes length
 +
| {{change|Optional|}} VarInt
 +
| Size of the following array; should always be 1024.  {{change|Not present if full chunk is false.|}}
 +
|-
 +
| Biomes
 +
| {{change|Optional|}} Array of VarInt
 +
| 1024 biome IDs, ordered by x then z then y, in 4&times;4&times;4 blocks.  {{change|Not present if full chunk is false.|}}  See [[Chunk Format#Biomes|Chunk Format § Biomes]].
 +
|-  
 +
| Size
 +
| VarInt
 +
| Size of Data in bytes
 +
|-
 +
| Data
 +
| Byte array
 +
| See [[Chunk Format#Data structure|data structure]] in Chunk Format
 +
|-
 +
| Number of block entities
 +
| VarInt
 +
| Number of elements in the following array
 +
|-
 +
| Block entities
 +
| Array of [[NBT|NBT Tag]]
 +
| All block entities in the chunk.  Use the x, y, and z tags in the NBT to determine their positions.
 +
|}
  
==== Animation ====
+
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.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=2 | 0x0B
 
| Entity ID || VarInt || Player ID
 
|-
 
| Animation || Unsigned Byte || Animation ID
 
|}
 
  
Animation can be one of the following values:
+
The compacted array format has been adjusted so that individual entries no longer span across multiple longs, affecting the main data array and heightmaps.
  
{| class="wikitable"
+
New format, 5 bits per block, containing the following references to blocks in a palette (not shown): <span style="border: solid 2px hsl(0, 90%, 60%)">1</span><span style="border: solid 2px hsl(30, 90%, 60%)">2</span><span style="border: solid 2px hsl(60, 90%, 60%)">2</span><span style="border: solid 2px hsl(90, 90%, 60%)">3</span><span style="border: solid 2px hsl(120, 90%, 60%)">4</span><span style="border: solid 2px hsl(150, 90%, 60%)">4</span><span style="border: solid 2px hsl(180, 90%, 60%)">5</span><span style="border: solid 2px hsl(210, 90%, 60%)">6</span><span style="border: solid 2px hsl(240, 90%, 60%)">6</span><span style="border: solid 2px hsl(270, 90%, 60%)">4</span><span style="border: solid 2px hsl(300, 90%, 60%)">8</span><span style="border: solid 2px hsl(330, 90%, 60%)">0</span><span style="border: solid 2px hsl(0, 90%, 30%)">7</span><span style="border: solid 2px hsl(30, 90%, 30%)">4</span><span style="border: solid 2px hsl(60, 90%, 30%)">3</span><span style="border: solid 2px hsl(90, 90%, 30%)">13</span><span style="border: solid 2px hsl(120, 90%, 30%)">15</span><span style="border: solid 2px hsl(150, 90%, 30%)">16</span><span style="border: solid 2px hsl(180, 90%, 30%)">9</span><span style="border: solid 2px hsl(210, 90%, 30%)">14</span><span style="border: solid 2px hsl(240, 90%, 30%)">10</span><span style="border: solid 2px hsl(270, 90%, 30%)">12</span><span style="border: solid 2px hsl(300, 90%, 30%)">0</span><span style="border: solid 2px hsl(330, 90%, 30%)">2</span>
! ID !! Animation
 
|-
 
| 0 || No animation
 
|-
 
| 1 || Swing arm
 
|-
 
| 2 || Damage animation
 
|-
 
| 3 || Leave bed
 
|-
 
| 5 || Eat food
 
|-
 
| 6 || Critical effect
 
|-
 
| 7 || Magic critical effect
 
|-
 
| 102 || (unknown)
 
|-
 
| 104 || Crouch
 
|-
 
| 105 || Uncrouch
 
|}
 
  
==== Spawn Player ====
+
<code>0020863148418841</code> <code><span style="outline: dashed 2px black">0000</span><span style="outline: solid 2px hsl(330, 90%, 60%)">00000</span><span style="outline: solid 2px hsl(300, 90%, 60%)">01000</span><span style="outline: solid 2px hsl(270, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(240, 90%, 60%)">00110</span><span style="outline: solid 2px hsl(210, 90%, 60%)">00110</span><span style="outline: solid 2px hsl(180, 90%, 60%)">00101</span><span style="outline: solid 2px hsl(150, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(120, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(90, 90%, 60%)">00011</span><span style="outline: solid 2px hsl(60, 90%, 60%)">00010</span><span style="outline: solid 2px hsl(30, 90%, 60%)">00010</span><span style="outline: solid 2px hsl(0, 90%, 60%)">00001</span></code><br>
{| class="wikitable"
+
<code>01018A7260F68C87</code> <code><span style="outline: dashed 2px black">0000</span><span style="outline: solid 2px hsl(330, 90%, 30%)">00010</span><span style="outline: solid 2px hsl(300, 90%, 30%)">00000</span><span style="outline: solid 2px hsl(270, 90%, 30%)">01100</span><span style="outline: solid 2px hsl(240, 90%, 30%)">01010</span><span style="outline: solid 2px hsl(210, 90%, 30%)">01110</span><span style="outline: solid 2px hsl(180, 90%, 30%)">01001</span><span style="outline: solid 2px hsl(150, 90%, 30%)">10000</span><span style="outline: solid 2px hsl(120, 90%, 30%)">01111</span><span style="outline: solid 2px hsl(90, 90%, 30%)">01101</span><span style="outline: solid 2px hsl(60, 90%, 30%)">00011</span><span style="outline: solid 2px hsl(30, 90%, 30%)">00100</span><span style="outline: solid 2px hsl(0, 90%, 30%)">00111</span></code>
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=10 | 0x0C
 
| Entity ID || VarInt || Player's Entity ID
 
|-
 
| Player UUID || String || Player's UUID
 
|-
 
| Player Name || String || Player's Name
 
|-
 
| X || Int || Player X as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| Y || Int || Player X as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| Z || Int || Player X as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| Yaw || Byte || Player rotation as a packed byte
 
|-
 
| Pitch || Byte || Player rotation as a packet byte
 
|-
 
| Current Item || Short || The item the player is currently holding. Note that this should be 0 for "no item", unlike -1 used in other packets. A negative value crashes clients.
 
|-
 
| Metadata || [[Entities#Entity_Metadata_Format|Metadata]] || The client will crash if no metadata is sent
 
|}
 
  
==== Collect Item ====
+
==== Entity Movement ====
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=2 | 0x0D
 
| Collected Entity ID || Int ||
 
|-
 
| Collector Entity ID || Int ||
 
|}
 
  
==== Spawn Object ====
+
This packet may be used to initialize an entity.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=8| 0x0E
 
| Entity ID || VarInt || Entity ID of the object
 
|-
 
| Type || Byte || The of object (See [[Entities#Objects|Objects]]
 
|-
 
| X || Int || X position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| Y || Int || Y position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| Z || Int || Z position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| Pitch || Byte || The pitch in steps of 2p/256
 
|-
 
| Yaw || Byte || The yaw in steps of 2p/256
 
|-
 
| Data || [[Object_Data|Object Data]] ||
 
|}
 
  
==== Spawn Mob ====
+
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"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=12 | 0x0F
 
| Entity ID || VarInt || Entity's ID
 
|-
 
| Type || Unsigned Byte || The type of mob. See [[Entities#Mobs|Mobs]]
 
|-
 
| X || Int || X position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| Y || Int || Y position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| Z || Int || Z position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| Pitch || Byte || The pitch in steps of 2p/256
 
|-
 
| Head Pitch || Byte || The pitch in steps of 2p/256
 
|-
 
| Yaw || Byte || The yaw in steps of 2p/256
 
|-
 
| Velocity X || Short ||
 
|-
 
| Velocity Y || Short ||
 
|-
 
| Velocity Z || Short ||
 
|-
 
| Metadata || [[Entities#Entity_Metadata_Format|Metadata]] ||
 
|}
 
  
==== Spawn Painting ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan=6 | 0x10
+
! Bound To
| Entity ID || VarInt || Entity's ID
+
! Field Name
|-
+
! Field Type
| Title || String || Name of the painting. Max length 13
+
! Notes
|-
+
|- {{removed}}
| X || Int || Center X coordinate
+
| 0x2A
|-
+
| Play
| Y || Int || Center Y coordinate
+
| Client
|-
+
| Entity ID
| Z || Int || Center Z coordinate
+
| VarInt
|-
+
|  
| Direction || Int || Direction the painting faces (0 -z, 1 -x, 2 +z, 3 +x)
+
|}
|}
 
  
==== Spawn Experience Orb ====
+
==== Update Light ====
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=5 | 0x11
 
| Entity ID || VarInt || Entity's ID
 
|-
 
| X || Int || X position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| Y || Int || Y position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| Z || Int || Z position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| Count || Short || The amount of experience this orb will reward once collected
 
|}
 
  
==== Entity Velocity ====
+
Updates light levels for a chunk.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=4 | 0x12
 
| Entity ID || Int || Entity's ID
 
|-
 
| Velocity X || Short || Velocity on the X axis
 
|-
 
| Velocity Y || Short || Velocity on the Y axis
 
|-
 
| Velocity Z || Short || Velocity on the Z axis
 
|}
 
  
==== Destroy Entities====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan=2 | 0x13
+
! Bound To
| Count || Byte || Length of following array
+
!colspan="2"| Field Name
|-
+
!colspan="2"| Field Type
| Entity IDs || Array of Int || The list of entities of destroy
+
! Notes
|}
+
|-
 +
|rowspan="21"| {{change|0x23|0x25}}
 +
|rowspan="21"| Play
 +
|rowspan="21"| Client
 +
|colspan="2"| Chunk X
 +
|colspan="2"| VarInt
 +
| 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"| Trust Edges
 +
|colspan="2"| Boolean
 +
| If edges should be trusted for light updates.
 +
|- {{removed}}
 +
|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)
 +
|- {{removed}}
 +
|colspan="2"| Block Light Mask
 +
|colspan="2"| VarInt
 +
| Mask containing 18 bits, with the same order as sky light
 +
|- {{removed}}
 +
|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.
 +
|- {{removed}}
 +
|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.
 +
|- {{Added}}
 +
|colspan="2"| Length 1
 +
|colspan="2"| VarInt
 +
| Length of the following array
 +
|- {{Added}}
 +
|colspan="2"| Sky Light Mask
 +
|colspan="2"| Array of Long
 +
| BitSet containing bits for each sections in the world + 2 (lowest bit 16-1 blocks below min world height, highest 1-16 above max world height)
 +
|- {{Added}}
 +
|colspan="2"| Length 2
 +
|colspan="2"| VarInt
 +
| Length of the following array
 +
|- {{Added}}
 +
|colspan="2"| Block Light Mask
 +
|colspan="2"| Array of Long
 +
| BitSet containing bits for each sections in the world + 2, same order as sky light
 +
|- {{Added}}
 +
|colspan="2"| Length 3
 +
|colspan="2"| VarInt
 +
| Length of the following array
 +
|- {{Added}}
 +
|colspan="2"| Empty Sky Light Mask
 +
|colspan="2"| Array of Long
 +
| BitSet containing a variable amount of bits (see sky/block light) which indicates sections that have 0 for all their sky light values
 +
|- {{Added}}
 +
|colspan="2"| Length 4
 +
|colspan="2"| VarInt
 +
| Length of the following array
 +
|- {{Added}}
 +
|colspan="2"| Empty Block Light Mask
 +
|colspan="2"| Array of Long
 +
| BitSet containing a variable amount of bits (see sky/block light) which indicates sections that have 0 for all their block light values
 +
|- {{added}}
 +
|colspan="2"| Sky Light array count
 +
|colspan="2"| VarInt
 +
| Number of entries in the following array
 +
|-
 +
|rowspan="2"| Sky Light arrays
 +
| Length
 +
|rowspan="2"| Array
 +
| VarInt
 +
| Length of the following array in bytes (always 2048)
 +
|-
 +
| Sky Light array
 +
| Array of 2048 bytes
 +
| 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.
 +
|- {{added}}
 +
|colspan="2"| Block Light array count
 +
|colspan="2"| VarInt
 +
| Number of entries in the following array
 +
|-
 +
|rowspan="2"| Block Light arrays
 +
| Length
 +
|rowspan="2"| Array
 +
| VarInt
 +
| Length of the following array in bytes (always 2048)
 +
|-
 +
| Block Light array
 +
| Array of 2048 bytes
 +
| 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.
 +
|}
  
==== Entity ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=1 | 0x14
 
| Entity ID || Int || Entity's ID
 
|}
 
  
==== Entity Relative Move ====
+
==== Map Data ====
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=4| 0x15
 
| Entity ID || Int || Entity's ID
 
|-
 
| DX || Byte || Change in X position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| DY || Byte || Change in Y position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| DZ || Byte || Change in Z position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|}
 
  
==== Entity Look ====
+
Updates a rectangular area on a {{Minecraft Wiki|map}} item.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=3 | 0x16
 
| Entity ID || Int || Entity's ID
 
|-
 
| Yaw || Byte || The X Axis rotation as a fraction of 360
 
|-
 
| Pitch || Byte || The Y Axis rotation as a fraction of 360
 
|}
 
  
==== Entity Look and Relative Move ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan=6 | 0x17
+
! Bound To
| Entity ID || Int || Entity's ID
+
!colspan="2"| Field Name
|-
+
!colspan="2"| Field Type
| DX || Byte || Change in X position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
+
! Notes
|-
+
|-
| DY || Byte || Change in Y position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
+
|rowspan="18"| {{change|0x25|0x27}}
|-
+
|rowspan="18"| Play
| DZ || Byte || Change in Z position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
+
|rowspan="18"| Client
|-
+
|colspan="2"| Map ID
| Yaw || Byte || The X Axis rotation as a fraction of 360
+
|colspan="2"| VarInt
|-
+
| Map ID of the map being modified
| Pitch || Byte || The Y Axis rotation as a fraction of 360
+
|-
|}
+
|colspan="2"| Scale
 +
|colspan="2"| Byte
 +
| From 0 for a fully zoomed-in map (1 block per pixel) to 4 for a fully zoomed-out map (16 blocks per pixel)
 +
|- {{removed}}
 +
|colspan="2"| Tracking Position
 +
|colspan="2"| Boolean
 +
| Specifies whether player and item frame icons are shown
 +
|-
 +
|colspan="2"| Locked
 +
|colspan="2"| Boolean
 +
| True if the map has been locked in a cartography table
 +
|-
 +
|- {{added}}
 +
|colspan="2"| Tracking Position
 +
|colspan="2"| Boolean
 +
| Specifies whether player and item frame icons are shown
 +
|-
 +
|colspan="2"| Icon Count
 +
|colspan="2"| VarInt
 +
| Number of elements in the following array. {{change||Only present if "Tracking Position" is true.}}
 +
|-
 +
|rowspan="6"| Icon
 +
| Type
 +
|rowspan="6"| Array
 +
| VarInt enum
 +
| See below
 +
|-
 +
| X
 +
| Byte
 +
| Map coordinates: -128 for furthest left, +127 for furthest right
 +
|-
 +
| Z
 +
| Byte
 +
| Map coordinates: -128 for highest, +127 for lowest
 +
|-
 +
| Direction
 +
| Byte
 +
| 0-15
 +
|-
 +
| Has Display Name
 +
| Boolean
 +
|
 +
|-
 +
| Display Name
 +
| Optional [[Chat]]
 +
| Only present if previous Boolean is true
 +
|-  
 +
|colspan="2"| Columns
 +
|colspan="2"| Unsigned Byte
 +
| 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
 +
|-
 +
|colspan="2"| Z
 +
|colspan="2"| Optional Byte
 +
| Only if Columns is more than 0; z offset of the northernmost row
 +
|-
 +
|colspan="2"| Length
 +
|colspan="2"| Optional VarInt
 +
| Only if Columns is more than 0; length of the following array
 +
|-
 +
|colspan="2"| Data
 +
|colspan="2"| Optional Array of Unsigned Byte
 +
| Only if Columns is more than 0; see {{Minecraft Wiki|Map item format}}
 +
|}
  
==== Entity Teleport ====
+
For icons, a direction of 0 is a vertical icon and increments by 22.5&deg; (360/16).
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=6 | 0x18
 
| Entity ID || Int || Entity's ID
 
|-
 
| X || Int || X position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| Y || Int || Y position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| Z || Int || Z position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| Yaw || Byte || The X Axis rotation as a fraction of 360
 
|-
 
| Pitch || Byte || The Y Axis rotation as a fraction of 360
 
|}
 
  
==== Entity Head Look ====
+
Types are based off of rows and columns in <code>map_icons.png</code>:
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=2 | 0x19
 
| Entity ID || Int || Entity's ID
 
|-
 
| Head Yaw || Byte || Head yaw in steps of 2p/256
 
|}
 
  
==== Entity Status ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
|-
|-
+
! Icon type
| rowspan=2 | 0x1A
+
! Result
| Entity ID || Int || Entity's ID
+
|-
|-
+
| 0
| Entity Status || Byte || See below
+
| White arrow (players)
|}
+
|-
 +
| 1
 +
| Green arrow (item frames)
 +
|-
 +
| 2
 +
| Red arrow
 +
|-
 +
| 3
 +
| Blue arrow
 +
|-
 +
| 4
 +
| White cross
 +
|-
 +
| 5
 +
| Red pointer
 +
|-
 +
| 6
 +
| White circle (off-map players)
 +
|-
 +
| 7
 +
| Small white circle (far-off-map players)
 +
|-
 +
| 8
 +
| Mansion
 +
|-
 +
| 9
 +
| Temple
 +
|-
 +
| 10
 +
| White Banner
 +
|-
 +
| 11
 +
| Orange Banner
 +
|-
 +
| 12
 +
| Magenta Banner
 +
|-
 +
| 13
 +
| Light Blue Banner
 +
|-
 +
| 14
 +
| Yellow Banner
 +
|-
 +
| 15
 +
| Lime Banner
 +
|-
 +
| 16
 +
| Pink Banner
 +
|-
 +
| 17
 +
| Gray Banner
 +
|-
 +
| 18
 +
| Light Gray Banner
 +
|-
 +
| 19
 +
| Cyan Banner
 +
|-
 +
| 20
 +
| Purple Banner
 +
|-
 +
| 21
 +
| Blue Banner
 +
|-
 +
| 22
 +
| Brown Banner
 +
|-
 +
| 23
 +
| Green Banner
 +
|-
 +
| 24
 +
| Red Banner
 +
|-
 +
| 25
 +
| Black Banner
 +
|-
 +
| 26
 +
| Treasure marker
 +
|}
  
{| class="wikitable"
+
==== Combat Event ====
|-
 
! Entity Status !! Meaning
 
|-
 
| 2 || Entity hurt
 
|-
 
| 3 || Entity dead
 
|-
 
| 6 || Wolf taming
 
|-
 
| 7 || Wolf tamed
 
|-
 
| 8 || Wolf shaking water off itself
 
|-
 
| 9 || (of self) Eating accepted by server
 
|-
 
| 10 || Sheep eating grass
 
|-
 
| 11 || Iron Golem handing over a rose
 
|-
 
| 12 || Spawn "heart" particles near a villager
 
|-
 
| 13 || Spawn particles indicating that a villager is angry and seeking revenge
 
|-
 
| 14 || Spawn happy particles near a villager
 
|-
 
| 15 || Spawn a "magic" particle near the Witch
 
|-
 
| 16 || Zombie converting into a villager by shaking violently (unused in recent update)
 
|-
 
| 17 || A firework exploding
 
|}
 
  
==== Attach Entity ====
+
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"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=3 | 0x1B
 
| Entity ID || Int || Entity's ID
 
|-
 
| Vehicle ID || Int || Vechicle's Entity ID
 
|-
 
| Leash || Bool || If true leashes the entity to the vehicle
 
|}
 
  
==== Entity Metadata ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan=2 | 0x1C
+
! Bound To
| Entity ID || Int || Entity's ID
+
!colspan="2"| Field Name
|-
+
! Field Type
| Metadata || [[Entities#Entity_Metadata_Format|Metadata]] ||
+
! Notes
|}
+
|- {{Removed}}
 +
|rowspan="8"| 0x31
 +
|rowspan="8"| Play
 +
|rowspan="8"| Client
 +
|colspan="2"| Event
 +
| VarInt Enum
 +
| Determines the layout of the remaining packet.
 +
|- {{Removed}}
 +
! Event
 +
! Field Name
 +
!  
 +
!  
 +
|- {{Removed}}
 +
| 0: enter combat
 +
| ''no fields''
 +
| ''no fields''
 +
|
 +
|- {{Removed}}
 +
|rowspan="2"| 1: end combat
 +
| Duration
 +
| VarInt
 +
| Length of the combat in ticks.
 +
|- {{Removed}}
 +
| Entity ID
 +
| Int
 +
| ID of the primary opponent of the ended combat, or -1 if there is no obvious primary opponent.
 +
|- {{Removed}}
 +
|rowspan="3"| 2: entity dead
 +
| Player ID
 +
| VarInt
 +
| Entity ID of the player that died (should match the client's entity ID).
 +
|- {{Removed}}
 +
| Entity ID
 +
| Int
 +
| The killing entity's ID, or -1 if there is no obvious killer.
 +
|- {{Removed}}
 +
| Message
 +
| [[Chat]]
 +
| The death message.
 +
|}
  
==== Entity Effect ====
+
==== End Combat Event ====
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=4 | 0x1D
 
| Entity ID || Int || Entity's ID
 
|-
 
| Effect ID || Byte || See [[http://www.minecraftwiki.net/wiki/Potion_effect#Parameters]]
 
|-
 
| Amplifier || Byte ||
 
|-
 
| Duration || Short ||
 
|}
 
  
==== Remove Entity Effect ====
+
Unused by the Notchain client.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=2 | 0x1E
 
| Entity ID || Int || Entity's ID
 
|-
 
| Effect ID || Byte ||
 
|}
 
  
==== Set Experience ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan=3 | 0x1F
+
! Bound To
| Experience bar || Float || Between 0 and 1
+
!colspan="2"| Field Name
|-
+
! Field Type
| Level || Short ||
+
! Notes
|-
+
|- {{Added}}
| Total Experience || Short ||
+
|rowspan="8"| 0x32
|}
+
|rowspan="8"| Play
 +
|rowspan="8"| Client
 +
| Duration
 +
| VarInt
 +
| Length of the combat in ticks.
 +
|- {{Added}}
 +
| Entity ID
 +
| Int
 +
| ID of the primary opponent of the ended combat, or -1 if there is no obvious primary opponent.
 +
|- {{Added}}
 +
|}
  
==== Entity Properties ====
+
==== Enter Combat Event ====
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=3 | 0x20
 
| Entity ID || Int | Entity's ID
 
|-
 
| Count || Int || Length of following array
 
|-
 
| Properties || Array of Property Data ||
 
|}
 
  
'''Property Data''' structure:
+
Unused by the Notchain client.
{| class="wikitable"
 
|-
 
! Field Name !! Field Type !! Notes
 
|-
 
| Key || String ||
 
|-
 
| Value || Double ||
 
|-
 
| List Length || Short || Number of list elements that follow.
 
|-
 
| Modifiers || Array of Modifier Data || http://www.minecraftwiki.net/wiki/Attribute#Modifiers
 
|}
 
  
Known key values:
 
 
{| class="wikitable"
 
{| class="wikitable"
|-
+
! Packet ID
! Key !! Default !! Min !! Max !! Label
+
! State
|-
+
! Bound To
| generic.maxHealth || 20.0 || 0.0 || Double.MaxValue || Max Health
+
!colspan="2"| Field Name
|-
+
! Field Type
| generic.followRange || 32.0 || 0.0 || 2048.0 || Follow Range
+
! Notes
|-
+
|- {{Added}}
| generic.knockbackResistance || 0.0 || 0.0 || 1.0 || Knockback Resistance
+
|rowspan="8"| 0x33
|-
+
|rowspan="8"| Play
| generic.movementSpeed || 0.699999988079071 || 0.0 || Double.MaxValue || Movement Speed
+
|rowspan="8"| Client
|-
+
|}
| generic.attackDamage || 2.0 || 0.0 || Double.MaxValue ||
 
|-
 
| horse.jumpStrength || 0.7 || 0.0 || 2.0 || Jump Strength
 
|-
 
| zombie.spawnReinforcements || 0.0 || 0.0 || 1.0 || Spawn Reinforcements Chance
 
|}
 
  
'''Modifier Data''' structure:
 
{| class="wikitable"
 
|-
 
! Field Name !! Field Type !! Notes
 
|-
 
| UUID || 128-bit integer ||
 
|-
 
| Amount || Double ||
 
|-
 
| Operation || Byte ||
 
|}
 
  
==== Chunk Data ====
+
==== Death Combat Event ====
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=7 | 0x21
 
| Chunk X || Int || Chunk X coordinate
 
|-
 
| Chunk Z || Int || Chunk Z coordinate
 
|-
 
| Ground-Up continuous || Boolean || This is True if the packet represents all sections in this vertical column, where the primary bit map specifies exactly which sections are included, and which are air
 
|-
 
| Primary bit map || Unsigned Short || Bitmask with 1 for every 16x16x16 section which data follows in the compressed data.
 
|-
 
| Add bit map || Unsigned Short || Same as above, but this is used exclusively for the 'add' portion of the payload
 
|-
 
| Compressed size || Int || Size of compressed chunk data
 
|-
 
| Compressed data || Byte array || The chunk data is compressed using Zlib Deflate
 
|}
 
  
==== Multi Block Change ====
+
Used to send a respawn screen.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=5 | 0x22
 
| Chunk X || VarInt || Chunk X coordinate
 
|-
 
| Chunk Z || VarInt || Chunk Z Coordinate
 
|-
 
| Record count || Short || The number of blocks affected
 
|-
 
| Data size || Int ||  The total size of the data, in bytes. Should always be 4*record count
 
|-
 
| Records || Array of Records ||
 
|}
 
  
'''Record'''
 
 
{| class="wikitable"
 
{| class="wikitable"
|-
+
! Packet ID
! Bit mask !! Width !! Meaning
+
! State
|-
+
! Bound To
| 00 00 00 0F || 4 bits || Block metadata
+
!colspan="2"| Field Name
|-
+
! Field Type
| 00 00 FF F0 || 12 bits || Block ID
+
! Notes
|-
+
|- {{Added}}
| 00 FF 00 00 || 8 bits || Y co-ordinate
+
|rowspan="8"| 0x34
|-
+
|rowspan="8"| Play
| 0F 00 00 00 || 4 bits || Z co-ordinate, relative to chunk
+
|rowspan="8"| Client
|-
+
| Player ID
| F0 00 00 00 || 4 bits || X co-ordinate, relative to chunk
+
| VarInt
|}
+
| Entity ID of the player that died (should match the client's entity ID).
 +
|- {{Added}}
 +
| Entity ID
 +
| Int
 +
| The killing entity's ID, or -1 if there is no obvious killer.
 +
|- {{Added}}
 +
| Message
 +
| [[Chat]]
 +
| The death message.
 +
|}
  
==== Block Change ====
+
==== Player Position And Look (clientbound) ====  
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=5 | 0x23
 
| X || Int || Block X Coordinate
 
|-
 
| Y || Unsigned Byte || Block Y Coordinate
 
|-
 
| Z || Int || Block Z Coordinate
 
|-
 
| Block Type || VarInt || The new block type for the block
 
|-
 
| Block Data || Unsigned Byte || The new data for the block
 
|}
 
  
==== Block Action ====
+
Updates the player's position on the server. This packet will also close the “Downloading Terrain” screen when joining/respawning.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=6 | 0x24
 
| X || Int || Block X Coordinate
 
|-
 
| Y || Short || Block Y Coordinate
 
|-
 
| Z || Int || Block Z Coordinate
 
|-
 
| Byte 1 || Unsigned Byte || Varies depending on block - see [[Block_Actions]]
 
|-
 
| Byte 2 || Unsigned Byte || Varies depending on block - see [[Block_Actions]]
 
|-
 
| Block Type || VarInt || The block type for the block
 
|}
 
  
==== Block Break Animation ====
+
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?)”.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=5 | 0x25
 
| Entity ID || VarInt || Entity's ID
 
|-
 
| X || Int || rowspan=3 | Block Position
 
|-
 
| Y || Int
 
|-
 
| Z || Int
 
|-
 
| Destroy Stage || Byte || 0 - 9
 
|}
 
  
==== Map Chunk Bulk ====
+
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”.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=5 | 0x26
 
| Chunk column count || Short || The number of chunk in this packet
 
|-
 
| Data length || Int || The size of the data field
 
|-
 
| Sky light sent || Bool || Whether or not the chunk data contains a light nibble array. This is true in the main world, false in the end + nether
 
|-
 
| Data || Byte Array || Compressed chunk data
 
|-
 
| Meta information || Meta || See below
 
|}
 
  
'''Meta'''
+
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.
{| class="wikitable"
 
! Field Name !! Field Type !! Notes
 
|-
 
|Chunk X || Int || The X Coordinate of the chunk
 
|-
 
|Chunk Z || Int || The Z Coordinate of the chunk
 
|-
 
|Primary bitmap || Unsigned Short || A bitmap which specifies which sections are not empty in this chunk
 
|-
 
|Add bitmap || Unsigned Short || A bitmap which specifies which sections need add information because of very high block ids. not yet used
 
|}
 
  
==== Explosion ====
+
Pitch is measured in degrees, where 0 is looking straight ahead, -90 is looking straight up, and 90 is looking straight down.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="9" | 0x27
 
| X || Float ||
 
|-
 
| Y || Float ||
 
|-
 
| Z || Float ||
 
|-
 
| Radius || Float || Currently unused in the client
 
|-
 
| Record count || Int || This is the count, not the size. The size is 3 times this value.
 
|-
 
| Records || (Byte, Byte, Byte) × count || 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 ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan="6" | 0x28
+
! Bound To
| Effect ID || Int || The ID of the effect, see below.
+
! Field Name
|-
+
! Field Type
| X || Int || The X location of the effect multiplied by 8
+
! Notes
|-
+
|-
| Y || Byte || The Y location of the effect multiplied by 8
+
|rowspan="8"| {{change|0x34|0x38}}
|-
+
|rowspan="8"| Play
| Z || Int || The Z location of the effect multiplied by 8
+
|rowspan="8"| Client
|-
+
| X
| Data || Int || Extra data for certain effects, see below.
+
| Double
|-
+
| Absolute or relative position, depending on Flags.
| Disable relative volume || Bool || See above
+
|-
|}
+
| Y
 
+
| Double
'''Sound''':
+
| Absolute or relative position, depending on Flags.
 
+
|-
*1000: <code>random.click</code>
+
| Z
*1001: <code>random.click</code>
+
| Double
*1002: <code>random.bow</code>
+
| Absolute or relative position, depending on Flags.
*1003: <code>random.door_open</code> or <code>random.door_close</code> (50/50 chance)
+
|-
*1004: <code>random.fizz</code>
+
| Yaw
*1005: Play a music disc. '''Data''': [http://www.minecraftwiki.net/wiki/Music_Discs Record ID]
+
| Float
*''(1006 not assigned)''
+
| Absolute or relative rotation on the X axis, in degrees.
*1007: <code>mob.ghast.charge</code>
+
|-
*1008: <code>mob.ghast.fireball</code>
+
| Pitch
*1009: <code>mob.ghast.fireball</code>, but with a lower volume.
+
| Float
*1010: <code>mob.zombie.wood</code>
+
| Absolute or relative rotation on the Y axis, in degrees.
*1011: <code>mob.zombie.metal</code>
+
|-
*1012: <code>mob.zombie.woodbreak</code>
+
| Flags
*1013: <code>mob.wither.spawn</code>
+
| Byte
*1014: <code>mob.wither.shoot</code>
+
| Bit field, see below.
*1015: <code>mob.bat.takeoff</code>
+
|-
*1016: <code>mob.zombie.infect</code>
+
| Teleport ID
*1017: <code>mob.zombie.unfect</code>
+
| VarInt
*1018: <code>mob.enderdragon.end</code>
+
| Client should confirm this packet with [[#Teleport Confirm|Teleport Confirm]] containing the same Teleport ID.
*1020: <code>random.anvil_break</code>
+
|- {{added}}
*1021: <code>random.anvil_use</code>
+
| Dismount Vehicle
*1022: <code>random.anvil_land</code>
+
| Boolean
 
+
| True if the player should dismount their vehicle.
'''Particle''':
+
|}
 
 
*2000: Spawns 10 smoke particles, e.g. from a fire. '''Data''': direction, see below
 
*2001: Block break. '''Data''': [http://www.minecraftwiki.net/wiki/Data_values Block ID]
 
*2002: Splash potion. Particle effect + glass break sound. '''Data''': [http://www.lb-stuff.com/Minecraft/PotionDataValues1.9pre3.txt Potion ID]
 
*2003: Eye of ender entity break animation - particles and sound
 
*2004: Mob spawn particle effect: smoke + flames
 
*2005: Spawn "happy villager" effect (hearts).
 
 
 
Smoke directions:
 
  
{| class="wikitable"
+
About the Flags field:
! ID !! Direction
 
|-
 
| 0 || South - East
 
|-
 
| 1 || South
 
|-
 
| 2 || South - West
 
|-
 
| 3 || East
 
|-
 
| 4 || (Up or middle ?)
 
|-
 
| 5 || West
 
|-
 
| 6 || North - East
 
|-
 
| 7 || North
 
|-
 
| 8 || North - West
 
|}
 
  
==== Sound Effect ====
+
<Dinnerbone> It's a bitfield, X/Y/Z/Y_ROT/X_ROT. If X is set, the x value is relative and not absolute.
  
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
|-
|-
+
! Field
| rowspan="7" | 0x29
+
! Bit
| Sound name || String ||
+
|-
|-
+
| X
| Effect position X || Int || Effect X multiplied by 8
+
| 0x01
|-
+
|-
| Effect position Y || Int || Effect Y multiplied by 8
+
| Y
|-
+
| 0x02
| Effect position Z || Int || Effect Z multiplied by 8
+
|-
|-
+
| Z
| Volume || Float || 1 is 100%, can be more
+
| 0x04
|-
+
|-
| Pitch || Unsigned Byte || 63 is 100%, can be more
+
| Y_ROT
|-
+
| 0x08
| Sound Category || Unsigned Byte || Possible values:
+
|-
MASTER: 0
+
| X_ROT
 +
| 0x10
 +
|}
  
MUSIC: 1
+
==== Destroy Entity ====
  
RECORDS: 2
+
Sent by the server when {{change|a list of entities|an entity}} is to be destroyed on the client.
  
WEATHER: 3
 
 
BLOCKS: 4
 
 
MOBS: 5
 
 
ANIMALS: 6
 
 
PLAYERS: 7
 
|}
 
 
==== Particle ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan="9" | 0x2A
+
! Bound To
| Particle name || String || The name of the particle to create. A list can be found [https://gist.github.com/thinkofdeath/5110835 here]
+
! Field Name
|-
+
! Field Type
| X || Float || X position of the particle
+
! Notes
|-
+
|-
| Y || Float || Y position of the particle
+
|rowspan="4"| 0x36
|-
+
|rowspan="4"| Play
| Z || Float || Z position of the particle
+
|rowspan="4"| Client
|-
+
|- {{removed}}
| Offset X || Float || This is added to the X position after being multiplied by random.nextGaussian()
+
| Count
|-
+
| VarInt
| Offset Y || Float || This is added to the Y position after being multiplied by random.nextGaussian()
+
| Number of elements in the following array.
|-
+
|- {{Removed}}
| Offset Z || Float || This is added to the Z position after being multiplied by random.nextGaussian()
+
| Array of VarInt
|-
+
| The list of entities of destroy.
| Particle speed || Float || The speed of each particle
+
|- {{Added}}
|-
+
| Entity ID
| Number of particles || Int || The number of particles to create
+
| VarInt
|}
+
|}
  
==== Change Game State ====
+
==== Resource Pack Send ====  
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="2" | 0x2B
 
| Reason || Unsigned Byte ||
 
|-
 
| Value || Float || Depends on reason
 
|}
 
 
 
'''Reason codes'''
 
  
 
{| class="wikitable"
 
{| class="wikitable"
! Code !! Effect !! Notes
+
! Packet ID
|-
+
! State
| 0 || Invalid Bed || "tile.bed.notValid"
+
! Bound To
|-
+
! Field Name
| 1 || Begin raining ||  
+
! Field Type
|-
+
! Notes
| 2 || End raining ||
+
|-
|-
+
|rowspan="4"| {{change|0x38|0x3B}}
| 3 || Change game mode || "gameMode.changed" 0 - Survival, 1 - Creative, 2 - Adventure
+
|rowspan="4"| Play
|-
+
|rowspan="4"| Client
| 4 || Enter credits ||
+
| URL
|-
+
| String (32767)
| 5 || Demo messages || 0 - Show welcome to demo screen, 101 - Tell movement controls, 102 - Tell jump control, 103 - Tell inventory control
+
| The URL to the resource pack.
|-  
+
|-
| 6 | Bow hit sound ||
+
| Hash
|-
+
| String (40)
| 7 || Fade value || The current darkness value. 1 = Dark, 0 = Bright, Setting the value higher causes the game to change color and freeze
+
| 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
|-
+
|- {{Added}}
| 8 || Fade time || Time in ticks for the sky to fade
+
| Forced
|}
+
| Boolean
 +
| The notchian client will be forced to use the resource pack from the server. If they decline they will be kicked from the server.
 +
|- {{Added}}
 +
| Forced Message
 +
| [[Chat]]
 +
| This is sent with the force resourcepack popup.
 +
|}
 +
==== Title ====
  
==== Spawn Global Entity ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan="5" | 0x2C
+
! Bound To
| Entity ID || VarInt || The entity ID of the thunderbolt
+
!colspan="2"| Field Name
|-
+
! Field Type
| Type || Byte || The global entity type, currently always 1 for thunderbolt.
+
! Notes
|-
+
|- {{ Removed }}
| X || Int || Thunderbolt X a [[Data_Types#Fixed-point_numbers|fixed-point number]]
+
|rowspan="10"| 0x4F
|-
+
|rowspan="10"| Play
| Y || Int || Thunderbolt Y a [[Data_Types#Fixed-point_numbers|fixed-point number]]
+
|rowspan="10"| Client
|-
+
|colspan="2"| Action
| Z || Int || Thunderbolt Z a [[Data_Types#Fixed-point_numbers|fixed-point number]]
+
| VarInt Enum
|}
+
|  
 +
|- {{ Removed }}
 +
! Action
 +
! Field Name
 +
!
 +
!
 +
|- {{ Removed }}
 +
| 0: set title
 +
| Title Text
 +
| [[Chat]]
 +
|  
 +
|- {{ Removed }}
 +
| 1: set subtitle
 +
| Subtitle Text
 +
| [[Chat]]
 +
|
 +
|- {{ Removed }}
 +
| 2: set action bar
 +
| Action bar text
 +
| [[Chat]]
 +
| Displays a message above the hotbar (the same as position 2 in [[#Chat Message (clientbound)|Chat Message (clientbound)]].
 +
|- {{ Removed }}
 +
|rowspan="3"| 3: set times and display
 +
| Fade In
 +
| Int
 +
| Ticks to spend fading in.
 +
|- {{ Removed }}
 +
| Stay
 +
| Int
 +
| Ticks to keep the title displayed.
 +
|- {{ Removed }}
 +
| Fade Out
 +
| Int
 +
| Ticks to spend out, not when to start fading out.
 +
|- {{ Removed }}
 +
| 4: hide
 +
| ''no fields''
 +
| ''no fields''
 +
|  
 +
|- {{ Removed }}
 +
| 5: reset
 +
| ''no fields''
 +
| ''no fields''
 +
|  
 +
|}
  
==== Open Window ====
+
“Hide” makes the title disappear, but if you run times again the same title will appear. “Reset” erases the text.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="6" | 0x2D
 
| Window id || Unsigned Byte || A unique id number for the window to be displayed.  Notchian server implementation is a counter, starting at 1.
 
|-
 
| Inventory Type || Unsigned Byte || The window type to use for display.  Check below
 
|-
 
| Window title || String || 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).
 
|-
 
| Use provided window title || Bool || If false, the client will look up a string like "window.minecart". If true, the client uses what the server provides.
 
|-
 
| Entity ID || Int || EntityHorse's entityId. Only sent when window type is equal to 11 (AnimalChest).
 
|}
 
  
See [[Inventory#Windows|inventory windows]] for further information.
+
The title is visible on screen for Fade In + Stay + Fade Out ticks.
  
==== Close Window ====
+
==== Action Bar ====
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| 0x2E
 
| Window ID || Unsigned Byte || This is the id of the window that was closed. 0 for inventory.
 
|}
 
  
==== Set Slot ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan="3" | 0x2F
+
! Bound To
| Window ID || Unsigned Byte
+
! Field Name
| 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).
+
! Field Type
|-
+
! Notes
| Slot || Short || The slot that should be updated
+
|- {{ Added }}
|-
+
|rowspan="4"| 0x40
| Slot data || [[Slot_Data|Slot]] ||
+
|rowspan="4"| Play
|}
+
|rowspan="4"| Client
 +
| Action bar text
 +
| [[Chat]]
 +
| Displays a message above the hotbar (the same as position 2 in [[#Chat Message (clientbound)|Chat Message (clientbound)]].
 +
|- {{ Added }}
 +
|}
 +
==== World Border Center ====
  
==== Window Items ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan="3" | 0x30
+
! Bound To
| Window ID || Unsigned Byte || The id of window which items are being sent for. 0 for player inventory.
+
! Field Name
|-
+
! Field Type
| Count || Short || The number of slots (see below)
+
! Notes
|-
+
|- {{ Added }}
| Slot data || Array of [[Slot_Data|Slot]]s ||
+
|rowspan="18"| 0x41
|}
+
|rowspan="18"| Play
 +
|rowspan="18"| Client
 +
| X
 +
| Double
 +
|  
 +
|- {{ Added }}
 +
| Z
 +
| Double
 +
|  
 +
|- {{ Added }}
 +
|}
 +
==== World Border Lerp Size ====
  
See [[Inventory#Windows|inventory windows]] for further information about how slots are indexed.
 
 
==== Window Property ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan="3" | 0x31
+
! Bound To
| Window ID || Unsigned Byte || The id of the window.
+
! Field Name
|-
+
! Field Type
| Property || Short || Which property should be updated.
+
! Notes
|-
+
|- {{ Added }}
| Value || Short || The new value for the property.
+
|rowspan="4"| 0x42
|}
+
|rowspan="4"| Play
 +
|rowspan="4"| Client
 +
| Old Diameter
 +
| Double
 +
| Current length of a single side of the world border, in meters.
 +
|- {{ Added }}
 +
| New Diameter
 +
| Double
 +
| Target length of a single side of the world border, in meters.
 +
|- {{ Added }}
 +
| Speed
 +
| VarLong
 +
| Number of real-time ''milli''seconds until New Diameter is reached. It appears that Notchian server does not sync world border speed to game ticks, so it gets out of sync with server lag. If the world border is not moving, this is set to 0.
 +
|-
 +
|}
 +
==== World Border Size ====
  
'''Furnace'''
 
 
Properties:
 
 
* 0: Progress arrow
 
* 1: Fire icon (fuel)
 
 
Values:
 
 
* 0-200 for progress arrow
 
* 0-200 for fuel indicator
 
 
Ranges are presumably in in-game ticks
 
 
'''Enchantment Table'''
 
 
Properties: 0, 1 or 2 depending on the "enchantment slot" being given.
 
 
Values: The enchantment's level.
 
 
==== Confirm Transaction  ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan="3" | 0x32
+
! Bound To
| Window ID || Unsigned Byte || The id of the window that the action occurred in.
+
! Field Name
|-
+
! Field Type
| Action number || Short || Every action that is to be accepted has a unique number. This field corresponds to that number.
+
! Notes
|-
+
|- {{ Added }}
| Accepted || Bool || Whether the action was accepted.
+
|rowspan="4"| 0x43
|}
+
|rowspan="4"| Play
 +
|rowspan="4"| Client
 +
| Diameter
 +
| Double
 +
| Length of a single side of the world border, in meters.
 +
|- {{ Added }}
 +
|}
  
==== Update Sign ====
+
==== World Border Warning Delay====  
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="7" | 0x33
 
| X || Int || Block X Coordinate
 
|-
 
| Y || Short || Block Y Coordinate
 
|-
 
| Z || Int || Block Z Coordinate
 
|-
 
| Line 1 || String || First line of text in the sign
 
|-
 
| Line 2 || String || Second line of text in the sign
 
|-
 
| Line 3 || String || Third line of text in the sign
 
|-
 
| Line 4 || String || Fourth line of text in the sign
 
|}
 
  
==== Maps ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan="4" | 0x34
+
! Bound To
| Item Damage || VarInt || The damage value of the map being modified
+
! Field Name
|-
+
! Field Type
| Length || Short || Length of following byte array
+
! Notes
|-
+
|- {{ Added }}
| Data || Byte Array || Array data
+
|rowspan="4"| 0x44
|}
+
|rowspan="4"| Play
 +
|rowspan="4"| Client
 +
| Warning Time
 +
| VarInt
 +
| In seconds as set by <code>/worldborder warning time</code>.
 +
|- {{ Added }}
 +
|}
  
If the first byte of the array is 0, the next two bytes are X start and Y start and the rest of the bytes are the colors in that column.
+
==== World Border Warning Reach====
  
If the first byte of the array is 1, the rest of the bytes are in groups of three: (data, x, y). The lower half of the data is the type (always 0 under vanilla) and the upper half is the direction.
 
 
If the first byte of the array is 2, the second byte is the map scale.
 
 
==== Update Block Entity ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan="6" | 0x35
+
! Bound To
| X || Int ||
+
! Field Name
|-
+
! Field Type
| Y || Short ||
+
! Notes
|-
+
|- {{ Added }}
| Z || Int ||
+
|rowspan="4"| 0x45
|-
+
|rowspan="4"| Play
| Action || Unsigned Byte || The type of update to perform
+
|rowspan="4"| Client
|-
+
| Warning Blocks
| Data length || Short || Varies
+
| VarInt
|-
+
| In meters.
| NBT Data || Byte Array || Present if data length > 0. Compressed with [[wikipedia:Gzip|gzip]]. Varies
+
|- {{ Added }}
|}
+
|}
 
 
'''Actions'''
 
  
* '''1''': Set mob displayed inside a mob spawner. Custom 1 contains the [[Entities#Mobs|mob type]]
+
==== Set Title SubTitle ====
  
==== Sign Editor Open ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan="3" | 0x36
+
! Bound To
| X || Int || X in block coordinates
+
! Field Name
|-
+
! Field Type
| Y || Int || Y in block coordinates
+
! Notes
|-
+
|- {{ Added }}
| Z || Int || Z in block coordinates
+
|rowspan="4"| 0x56
|}
+
|rowspan="4"| Play
 +
|rowspan="4"| Client
 +
| Subtitle Text
 +
| [[Chat]]
 +
|- {{ Added }}
 +
|}
  
==== Statistics ====
 
{| class="wikitable"
 
! Packet ID
 
! colspan="2" | Field Name
 
! Field Type !! Notes
 
|-
 
| rowspan="3" | 0x37
 
| colspan="2" | Count || VarInt || Number of entrys
 
|-
 
| rowspan=2 | Entry
 
| Statistic's name || String ||
 
|-
 
| Amount || VarInt || The amount to increase by
 
|}
 
  
==== Player List Item ====
+
==== Set Title Text ====  
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="3" | 0x38
 
| Player name || String || Supports chat colouring, limited to 16 characters.
 
|-
 
| Online || Bool || The client will remove the user from the list if false.
 
|-
 
| Ping || Short || Ping, presumably in ms.
 
|}
 
  
==== Player Abilities ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan="3" | 0x39
+
! Bound To
| Flags || Byte ||
+
! Field Name
|-
+
! Field Type
| Flying speed || Float|| previous integer value divided by 250
+
! Notes
|-
+
|- {{ Added }}
| Walking speed || Float || previous integer value divided by 250
+
|rowspan="4"| 0x58
|}
+
|rowspan="4"| Play
 +
|rowspan="4"| Client
 +
| Title Text
 +
| [[Chat]]
 +
|- {{ Added }}
 +
|}
  
==== Tab-Complete ====
+
==== Set Title Time====  
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rospan=2| 0x3A
 
| Count || VarInt || Number of following strings
 
|-
 
| Match || String || Possible Tab-Complete
 
|}
 
  
==== Scoreboard Objective ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan="3" | 0x3B
+
! Bound To
| Objective name || String || An unique name for the objective
+
! Field Name
|-
+
! Field Type
| Objective value || String || The text to be displayed for the score.
+
! Notes
|-
+
|- {{ Added }}
| Create/Remove || Byte || 0 to create the scoreboard. 1 to remove the scoreboard. 2 to update the display text.  
+
|rowspan="4"| 0x59
|}
+
|rowspan="4"| Play
 +
|rowspan="4"| Client
 +
| Fade In
 +
| Int
 +
| Ticks to spend fading in.
 +
|- {{ Added }}
 +
| Stay
 +
| Int
 +
| Ticks to keep the title displayed.
 +
|- {{ Added }}
 +
| Fade Out
 +
| Int
 +
| Ticks to spend out, not when to start fading out.
 +
|}
  
==== Update Score ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="4" | 0x3C
 
| Item Name || String || An unique name to be displayed in the list.
 
|-
 
| Update/Remove || Byte || 0 to create/update an item. 1 to remove an item.
 
|-
 
| Score Name || String || The unique name for the scoreboard to be updated. Only sent when Update/Remove does not equal 1.
 
|-
 
| Value || Int || The score to be displayed next to the entry. Only sent when Update/Remove does not equal 1.
 
|}
 
  
==== Display Scoreboard ====
+
==== Tags ====
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="2" | 0x3D
 
| Position || Byte || The position of the scoreboard. 0 = list, 1 = sidebar, 2 = belowName.
 
|-
 
| Score Name || String || The unique name for the scoreboard to be displayed.
 
|}
 
  
==== Teams ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan="8" | 0x3E
+
! Bound To
| Team Name || String || A unique name for the team. (Shared with scoreboard).
+
!colspan="2"| Field Name
|-
+
!colspan="2"| Field Type
| Mode || Byte || If 0 then the team is created.
+
! Notes
If 1 then the team is removed.
+
|-
 +
|rowspan="8"| {{change|0x5B|0x65}}
 +
|rowspan="8"| Play
 +
|rowspan="8"| Client
 +
|- {{removed}}
 +
| colspan="2"| Block Tags
 +
| colspan="2"| (See below)
 +
| IDs are block IDs
 +
|- {{removed}}
 +
| colspan="2"| Item Tags
 +
| colspan="2"| (See below)
 +
| IDs are item IDs
 +
|- {{removed}}
 +
| colspan="2"| Fluid Tags
 +
| colspan="2"| (See below)
 +
| IDs are fluid IDs
 +
|- {{removed}}
 +
| colspan="2"| Entity Tags
 +
| colspan="2"| (See below)
 +
| IDs are entity IDs
 +
|- {{added}}
 +
| colspan="2"| Length of the array
 +
| colspan="2"| VarInt
 +
|
 +
|- {{added}}
 +
|rowspan="2"| Array of tags
 +
| Tag type
 +
|rowspan="2"| Array
 +
| Identifier
 +
| Tag identifier (Vanilla required tags are <code>minecraft:block</code>, <code>minecraft:item</code>, <code>minecraft:fluid</code>, <code>minecraft:entity_type</code>, and <code>minecraft:game_event</code>)
 +
|-
 +
| Array of Tag
 +
| (See below)
 +
|
 +
|}
  
If 2 the team team information is updated.
+
Tags look like:
  
If 3 then new players are added to the team.
 
 
If 4 then players are removed from the team.
 
|-
 
| Team Display Name || String || Only if Mode = 0 or 2.
 
|-
 
| Team Prefix || String || Only if Mode = 0 or 2. Displayed before the players' name that are part of this team.
 
|-
 
| Team Suffix || String || Only if Mode = 0 or 2. Displayed after the players' name that are part of this team.
 
|-
 
| Friendly fire || Byte || Only if Mode = 0 or 2; 0 for off, 1 for on, 3 for seeing friendly invisibles
 
|-
 
| Player count || Short || Only if Mode = 0 or 3 or 4. Number of players in the array
 
|-
 
| Players || Array of strings || Only if Mode = 0 or 3 or 4. Players to be added/remove from the team.
 
|}
 
 
==== Plugin Message ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
!colspan="2"| Field Name
|-
+
!colspan="2"| Field Type
| rowspan="3" | 0x3F
+
! Notes
| Channel || String || Name of the "channel" used to send the data.
+
|-
|-
+
|colspan="2"| Length
| Length || Short || Length of the following byte array
+
|colspan="2"| VarInt
|-
+
| Number of elements in the following array
| Data || Byte Array || Any data.
+
|-
|}
+
|rowspan="3"| Tags
 +
| Tag name
 +
|rowspan="3"| Array
 +
| Identifier
 +
|
 +
|-
 +
| Count
 +
| VarInt
 +
| Number of elements in the following array
 +
|-
 +
| Entries
 +
| Array of VarInt
 +
| Numeric ID of the given type (block, item, etc.).
 +
|}
  
More documentation on this: http://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/
 
 
==== Disconnect ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| 0x40
 
| Reason || String || Displayed to the client when the connection terminates
 
|}
 
  
 
=== Serverbound ===
 
=== Serverbound ===
  
==== Keep Alive ====
+
==== Client Settings ====
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=1 | 0x00
 
| Keep Alive ID || Int ||
 
|}
 
  
==== Chat Message ====
+
Sent when the player connects, or when settings are changed.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=1 | 0x01
 
| JSON Data || String || https://gist.github.com/thinkofdeath/e882ce057ed83bac0a1c
 
|}
 
  
==== Use Entity ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan=2 | 0x02
+
! Bound To
| Target || Int ||
+
! Field Name
|-
+
! Field Type
| Mouse || Byte ||
+
! Notes
|}
+
|-
 +
|rowspan="7"| 0x05
 +
|rowspan="7"| Play
 +
|rowspan="7"| Server
 +
| Locale
 +
| String (16)
 +
| e.g. <code>en_GB</code>.
 +
|-
 +
| View Distance
 +
| Byte
 +
| Client-side render distance, in chunks.
 +
|-
 +
| Chat Mode
 +
| VarInt Enum
 +
| 0: enabled, 1: commands only, 2: hidden.  See [[Chat#Processing chat|processing chat]] for more information.
 +
|-
 +
| Chat Colors
 +
| Boolean
 +
| “Colors” multiplayer setting.
 +
|-
 +
| Displayed Skin Parts
 +
| Unsigned Byte
 +
| Bit mask, see below.
 +
|-
 +
| Main Hand
 +
| VarInt Enum
 +
| 0: Left, 1: Right.
 +
|- {{Added}}
 +
| Disable text filtering
 +
| Boolean
 +
| Disables filtering of text on signs and written book titles.  Currently always true (i.e. the filtering is disabled)
 +
|}
  
==== Player ====
+
''Displayed Skin Parts'' flags:
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=1 | 0x03
 
| On Ground || Bool || True if the client is on the ground, False otherwise
 
|}
 
  
==== Player Position ====
+
* Bit 0 (0x01): Cape enabled
{| class="wikitable"
+
* Bit 1 (0x02): Jacket enabled
! Packet ID !! Field Name !! Field Type !! Notes
+
* Bit 2 (0x04): Left Sleeve enabled
|-
+
* Bit 3 (0x08): Right Sleeve enabled
| rowspan=5| 0x04
+
* Bit 4 (0x10): Left Pants Leg enabled
| X || Double || Absolute position
+
* Bit 5 (0x20): Right Pants Leg enabled
|-
+
* Bit 6 (0x40): Hat enabled
| Y || Double || Absolute position
 
|-
 
| Stance || Double || Used to modify the players bounding box when going up stairs, crouching, etc…
 
|-
 
| Z || Double || Absolute position
 
|-
 
| On Ground || Bool || True if the client is on the ground, False otherwise
 
|}
 
  
==== Player Look ====
+
The most significant bit (bit 7, 0x80) appears to be unused.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=3| 0x05
 
| Yaw || Float || Absolute rotation on the X Axis, in degrees
 
|-
 
| Pitch || Float || Absolute rotation on the Y Axis, in degrees
 
|-
 
| On Ground || Bool || True if the client is on the ground, False otherwise
 
|}
 
  
==== Player Position And Look ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=7| 0x06
 
| X || Double || Absolute position
 
|-
 
| Y || Double || Absolute position
 
|-
 
| Stance || Double || Used to modify the players bounding box when going up stairs, crouching, etc…
 
|-
 
| Z || Double || Absolute position
 
|-
 
| Yaw || Float || Absolute rotation on the X Axis, in degrees
 
|-
 
| Pitch || Float || Absolute rotation on the Y Axis, in degrees
 
|-
 
| On Ground || Bool || True if the client is on the ground, False otherwise
 
|}
 
  
==== Player Digging ====
+
==== Window Confirmation (serverbound) ====
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="5" | 0x07
 
| Status || Byte || The action the player is taking against the block (see below)
 
|-
 
| X || Int || Block position
 
|-
 
| Y || Byte || Block position
 
|-
 
| Z || Int || Block position
 
|-
 
| Face || Byte || The face being hit (see below)
 
|}
 
  
Status can (currently) be one of six values:
+
If a confirmation sent by the client was not accepted, the server will reply with a [[#Window Confirmation (clientbound)|Window Confirmation (clientbound)]] packet with the Accepted field set to false. When this happens, the client must send this packet to apologize (as with movement), otherwise the server ignores any successive confirmations.
  
 
{| class="wikitable"
 
{| class="wikitable"
! Meaning !! Value
+
! Packet ID
|-
+
! State
| Started digging || <code>0</code>
+
! Bound To
|-
+
! Field Name
| Cancelled digging || <code>1</code>
+
! Field Type
|-
+
! Notes
| Finished digging || <code>2</code>
+
|- {{ Removed }}
|-
+
|rowspan="3"| 0x07
| Drop item stack || <code>3</code>
+
|rowspan="3"| Play
|-
+
|rowspan="3"| Server
| Drop item || <code>4</code>
+
| Window ID
|-
+
| Byte
| Shoot arrow / finish eating || <code>5</code>
+
| The ID of the window that the action occurred in.
|}
+
|- {{ Removed }}
 +
| Action Number
 +
| Short
 +
| Every action that is to be accepted has a unique number. This number is an incrementing integer (starting at 1) with separate counts for each window ID.
 +
|- {{ Removed }}
 +
| Accepted
 +
| Boolean
 +
| Whether the action was accepted.
 +
|}
 +
== Handshaking ==
  
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).
+
=== Clientbound ===
  
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.
+
There are no clientbound packets in the Handshaking state, since the protocol immediately switches to a different state after the client sends the first packet.  
  
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.
+
=== Serverbound ===
  
The face can be one of six values, representing the face being hit:
+
==== Handshake ====
  
{| class="wikitable"
+
This causes the server to switch into the target state.
|-
 
| Value || 0 || 1 || 2 || 3 || 4 || 5
 
|-
 
| Offset || -Y || +Y || -Z || +Z || -X || +X
 
|}
 
  
In 1.7.3, when a player opens a door with left click the server receives Packet 0xE+start digging and opens the door.
 
 
==== Player Block Placement ====
 
{| class="wikitable"
 
|-
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="8" | 0x08
 
| X || Int || Block position
 
|-
 
| Y || Unsigned Byte || Block position
 
|-
 
| Z || Int || Block position
 
|-
 
| Direction || Byte || The offset to use for block/item placement (see below)
 
|-
 
| Held item || [[Slot_Data|Slot]] ||
 
|-
 
| Cursor position X || Byte || The position of the crosshair on the block
 
|-
 
| Cursor position Y || Byte ||
 
|-
 
| Cursor position Z || Byte ||
 
|}
 
In normal operation (ie placing a block), this packet is sent once, with the values set normally.
 
 
This packet has a special case where X, Y, Z, and Direction 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, shooting 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 ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan=1 | 0x09
+
! Bound To
| Slot || Short || The slot which the player has selected (0-8)
+
! Field Name
|}
+
! Field Type
 
+
! Notes
==== Animation ====
+
|-
{| class="wikitable"
+
|rowspan="4"| 0x00
! Packet ID !! Field Name !! Field Type !! Notes
+
|rowspan="4"| Handshaking
|-
+
|rowspan="4"| Server
| rowspan=2 | 0x0A
+
| Protocol Version
| Entity ID || Int || Player ID
+
| VarInt
|-
+
| See [[protocol version numbers]] (currently {{change|754|{{Snapshot PVN|1073741839}}}})
| Animation || Byte || Animation ID
+
|-
|}
+
| Server Address
 
+
| String
 
+
| 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.
Animation can be one of the following values:
+
  |-  
 
+
| Server Port
{| class="wikitable"
+
| Unsigned Short
! ID !! Animation
+
| Default is 25565. The Notchian server does not use this information.
|-
+
|-
| 0 || No animation
+
| Next State
|-
+
| VarInt Enum
| 1 || Swing arm
+
| 1 for [[#Status|status]], 2 for [[#Login|login]]
|-
+
  |}
| 2 || Damage animation
 
|-
 
| 3 || Leave bed
 
|-
 
| 5 || Eat food
 
|-
 
| 6 || Critical effect
 
|-
 
| 7 || Magic critical effect
 
|-
 
| 102 || (unknown)
 
|-
 
| 104 || Crouch
 
|-
 
| 105 || Uncrouch
 
|}
 
 
 
==== Entity Action ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="3" | 0x0B
 
| Entity ID || Int || Player ID
 
|-
 
| Action ID || Byte || The ID of the action, see below.
 
|-
 
| Jump Boost || Int || Horse jump boost. Ranged from 0 -> 100.
 
|}
 
 
 
Action ID can be one of the following values:
 
 
 
{| class="wikitable"
 
! ID !! Action
 
|-
 
| 1 || Crouch
 
|-
 
| 2 || Uncrouch
 
|-
 
| 3 || Leave bed
 
|-
 
| 4 || Start sprinting
 
|-
 
| 5 || Stop sprinting
 
|}
 
 
 
==== Steer Vehicle ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="4" | 0x0C
 
| Sideways || Float || Positive to the left of the player
 
|-
 
| Forward || Float || Positive forward
 
|-
 
| Jump || Bool ||
 
|-
 
| Unmount || Bool || True when leaving the vehicle
 
|}
 
 
 
==== Close Window ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| 0x0D
 
| Window id || byte || This is the id of the window that was closed. 0 for inventory.
 
|}
 
 
 
 
 
==== Click Window ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="6" | 0x0E
 
| Window ID || Byte || The id of the window which was clicked. 0 for player inventory.
 
|-
 
| Slot || Short || The clicked slot. See below.
 
|-
 
| Button || Byte || The button used in the click. See below.
 
|-
 
| Action number || Short || A unique number for the action, used for transaction handling (See the Transaction packet).
 
|-
 
| Mode || Byte || Inventory operation mode. See below.
 
|-
 
| Clicked item || [[Slot_Data|Slot]] ||
 
|}
 
 
 
See [[Inventory#Windows|inventory windows]] for further information about how slots are indexed.
 
 
 
When right-clicking on a stack of items, half the stack will be picked up and half left in the slot. If the stack is an odd number, the half left in the slot will be smaller of the amounts.
 
 
 
The Action number is actually a counter, starting at 1.  This number is used by the server as a transaction ID to send back a [[#0x6A|Transaction packet]].
 
 
 
The distinct type of click performed by the client is determined by the combination of the "Mode" and "Button" fields.
 
{| class="wikitable"
 
! Mode !! Button !! Slot !! Trigger
 
|-
 
! rowspan="2" | 0
 
| 0 || Normal || Left mouse click
 
|-
 
| 1 || Normal || Right mouse click
 
|-
 
! rowspan="2" | 1
 
| 0 || Normal || Shift + left mouse click
 
|-
 
| 1 || Normal || Shift + right mouse click ''(Identical behavior)''
 
|-
 
! rowspan="5" | 2
 
| 0 || Normal || Number key 1
 
|-
 
| 1 || Normal || Number key 2
 
|-
 
| 2 || Normal || Number key 3
 
|-
 
| ...
 
| ...
 
| ...
 
|-
 
| 8 || Normal || Number key 9
 
|-
 
! rowspan="1" | 3
 
| 2 || Normal || Middle click
 
|-
 
! rowspan="4" | 4
 
| 0 || Normal || Drop key (Q)
 
|-
 
| 1 || Normal || Ctrl + Drop key (Ctrl-Q)
 
|-
 
| 0 || -999 || Left click outside inventory holding nothing ''(No-op)''
 
|-
 
| 1 || -999 || Right click outside inventory holding nothing ''(No-op)''
 
|-
 
! rowspan="6" | 5
 
| 0 || -999 || Starting left mouse drag ''(Or middle mouse)''
 
|-
 
| 4 || -999 || Starting right mouse drag
 
|-
 
| 1 || Normal || Add slot for left-mouse drag
 
|-
 
| 5 || Normal || Add slot for right-mouse drag
 
|-
 
| 2 || -999 || Ending left mouse drag
 
|-
 
| 6 || -999 || Ending right mouse drag
 
|-
 
! 6
 
| 0 || Normal || Double click
 
|}
 
 
 
Starting from version 1.5, "painting mode" is available for use in inventory windows. It is done by picking up stack of something (more than 1 items), then holding mouse button (left, right or middle) and dragging holded stack over empty (or same type in case of right button ) slots. In that case client sends the following to server after mouse button release (omitting first pickup packet which is sent as usual):
 
 
 
# packet with mode 5, slot -999 , button (0 for left | 4 for right);
 
# packet for every slot painted on, mode is still 5, button (1 | 5);
 
# packet with mode 5, slot -999, button (2 | 6);
 
 
 
If any of the painting packets other than the "progress" ones are sent out of order (for example, a start, some slots, then another start; or a left-click in the middle) the painting status will be reset.
 
 
 
==== Confirm Transaction ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="3" | 0x0F
 
| Window ID || Byte || The id of the window that the action occurred in.
 
|-
 
| Action number || Short || Every action that is to be accepted has a unique number. This field corresponds to that number.
 
|-
 
| Accepted || Bool || Whether the action was accepted.
 
|}
 
 
 
==== Creative Inventory Action ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="2" | 0x10
 
| Slot || Short || Inventory slot
 
|-
 
| Clicked item || [[Slot_Data|Slot]] ||
 
|}
 
 
 
==== Enchant Item ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="2" | 0x11
 
| Window ID || Byte || The ID sent by [[#0x64|Open Window]]
 
|-
 
| Enchantment || Byte || The position of the enchantment on the enchantment table window, starting with 0 as the topmost one.
 
|}
 
 
 
==== Update Sign ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="7" | 0x12
 
| X || Int || Block X Coordinate
 
|-
 
| Y || Short || Block Y Coordinate
 
|-
 
| Z || Int || Block Z Coordinate
 
|-
 
| Line 1 || String || First line of text in the sign
 
|-
 
| Line 2 || String || Second line of text in the sign
 
|-
 
| Line 3 || String || Third line of text in the sign
 
|-
 
| Line 4 || String || Fourth line of text in the sign
 
|}
 
 
 
==== Player Abilities ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="3" | 0x13
 
| Flags || Byte ||
 
|-
 
| Flying speed || Float|| previous integer value divided by 250
 
|-
 
| Walking speed || Float || previous integer value divided by 250
 
|}
 
 
 
==== Tab-Complete ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| 0x14
 
| Text || String ||
 
|}
 
 
 
 
 
==== Client Settings ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="6" | 0x15
 
| Locale || String || en_GB
 
|-
 
| View distance || Byte || 0-3 for 'far', 'normal', 'short', 'tiny'.
 
|-
 
| Chat flags || Byte || Chat settings. See notes below.
 
|-
 
| ??? || Bool || ???
 
|-
 
| Difficulty || Byte || Client-side difficulty from options.txt
 
|-
 
| Show Cape || Bool || Client-side "show cape" option
 
|}
 
 
 
Chat flags has several values packed into one byte.
 
 
 
'''Chat Enabled:''' Bits 0-1. 00: Enabled.  01: Commands only.  10: Hidden.
 
 
 
'''Colors Enabled:''' Bit 3. 0: Disabled.  1: Enabled.
 
 
 
==== Client Status ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=1 | 0x16
 
| Action ID || Byte || See below
 
|}
 
 
 
Action ID values:
 
{| class="wikitable"
 
|-
 
! Action ID !! Name
 
|-
 
| 1 || Perform respawn
 
|-
 
| 2 || Request stats
 
|-
 
| 3 || Open inventory achievement
 
|}
 
 
 
==== Plugin Message ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="3" | 0x17
 
| Channel || String || Name of the "channel" used to send the data.
 
|-
 
| Length || Short || Length of the following byte array
 
|-
 
| Data || Byte Array || Any data.
 
|}
 
 
 
More documentation on this: http://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/
 
  
 
== Status ==
 
== Status ==
The status ping works as follows.
 
    C->S : Handshake State=1
 
    C->S : Request
 
    S->C : Response
 
    C->S : Ping
 
    S->C : Ping
 
  
 
=== Clientbound ===
 
=== Clientbound ===
  
==== Response ====
+
No changes so far.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=1 | 0x00
 
| JSON Response || String || https://gist.github.com/thinkofdeath/6927216
 
|}
 
 
 
 
 
==== Ping ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=1 | 0x01
 
| Time || Long || Should be the same as sent by the client
 
|}
 
  
 
=== Serverbound ===
 
=== Serverbound ===
  
==== Request ====
+
No changes so far.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=1 | 0x00 || || ||
 
|}
 
 
 
 
 
==== Ping ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=1 | 0x01
 
| Time || Long ||
 
|}
 
  
 
== Login ==
 
== Login ==
 
The login process is as follows:
 
    C->S : Handshake State=2
 
    C->S : Login Start
 
    S->C : Encryption Key Request
 
    C->S : Encryption Key Response
 
    (Auth & enable encryption)
 
    S->C : Login Success
 
  
 
=== Clientbound ===
 
=== Clientbound ===
  
==== Disconnect ====
+
No changes so far.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=1 | 0x00
 
| JSON Data || String ||
 
|}
 
 
 
==== Encryption Response ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=5 | 0x01
 
| Server ID || String ||
 
|-
 
| Length || Short || length of public key
 
|-
 
| || Byte array || public key
 
|-
 
| Length || Short || length of verify token
 
|-
 
| || Byte array || verify token
 
|-
 
|}
 
 
 
==== Login Success ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=2 | 0x02
 
| UUID || String ||
 
|-
 
| Username || String ||
 
|}
 
  
 
=== Serverbound ===
 
=== Serverbound ===
  
==== Login Start  ====
+
No changes so far.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=1 | 0x00
 
| Name || String ||
 
|}
 
  
==== Encryption Request ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=4 | 0x01
 
| Length || Short || length of public key
 
|-
 
| || Byte array || public key
 
|-
 
| Length || Short || length of verify token
 
|-
 
| || Byte array || verify token
 
|-
 
|}
 
  
== Plugin Channels ==
+
[[Category:Minecraft Modern]]
 
 
=== MC|RPack ===
 
{| class="wikitable"
 
! Field Name !! Field Type !! Example !! Notes
 
|-
 
| Resource pack URL || UTF8 string || http://example.com/pack.zip ||
 
|}
 

Latest revision as of 02:28, 6 May 2021

This page documents the changes from the last stable Minecraft release (currently 1.16.5, protocol 754) to the current pre-release (currently 21w07a, protocol Snapshot 15). Note that this page contains bleeding-edge information that may not be completely or correctly documented.

One who wishes to commandeer the merging of this into Protocol when an update is made must be sure to respect any changes that may have occurred to the respective packets there.

Contents

Data types

No changes so far.

Packets

ID Packet name Documentation
Play clientbound
0x05 Sculk Vibration Signal Pre
0x05 0x06 Entity Animation (clientbound) Current (unchanged)
0x06 0x07 Statistics Current (unchanged)
0x07 0x08 Acknowledge Player Digging Current (unchanged)
0x08 0x09 Block Break Animation Current (unchanged)
0x09 0x0A Block Entity Data Current (unchanged)
0x0A 0x0B Block Action Current (unchanged)
0x0B 0x0C Block Change Current (unchanged)
0x0C 0x0D Boss Bar Current (unchanged)
0x0D 0x0E Server Difficulty Current (unchanged)
0x0E 0x0F Chat Message (clientbound) Current (unchanged)
0x10 Clear Titles Pre
0x0F 0x11 Tab-Complete (clientbound) Current (unchanged)
0x10 0x12 Declare Commands Current (unchanged)
0x11 Window Confirmation (clientbound) Current
0x12 0x13 Close Window (clientbound) Current (unchanged)
0x13 0x14 Window Items Current (unchanged)
0x14 0x15 Window Property Current (unchanged)
0x15 0x16 Set Slot Current (unchanged)
0x16 0x17 Set Cooldown Current (unchanged)
0x17 0x18 Plugin Message (clientbound) Current (unchanged)
0x18 0x19 Named Sound Effect Current (unchanged)
0x19 0x1A Disconnect (play) Current (unchanged)
0x1A 0x1B Entity Status Current (unchanged)
0x1B 0x1C Explosion Current (unchanged)
0x1C 0x1D Unload Chunk Current (unchanged)
0x1D 0x1E Change Game State Current (unchanged)
0x1E 0x1F Open Horse Window Current (unchanged)
0x20 Initialize World Border Pre
0x1F 0x21 Keep Alive (clientbound) Current (unchanged)
0x20 0x22 Chunk Data Current Pre
0x21 0x23 Effect Current (unchanged)
0x22 0x24 Particle Current (unchanged)
0x23 0x25 Update Light Current Pre
0x24 0x26 Join Game Current (unchanged)
0x25 0x27 Map Data Current Pre
0x26 0x28 Trade List Current (unchanged)
0x27 0x29 Entity Position Current (unchanged)
0x28 0x2A Entity Position and Rotation Current (unchanged)
0x29 0x2B Entity Rotation Current (unchanged)
0x2A Entity Movement Current
0x2B 0x2C Vehicle Move (clientbound) Current (unchanged)
0x2C 0x2D Open Book Current (unchanged)
0x2D 0x2E Open Window Current (unchanged)
0x2E 0x2F Open Sign Editor Current (unchanged)
0x2F 0x30 Craft Recipe Response Current (unchanged)
0x30 0x31 Player Abilities (clientbound) Current (unchanged)
0x31 Combat Event Current
0x32 End Combat Event Pre
0x33 Enter Combat Event Pre
0x34 Death Combat Event Pre
0x32 0x35 Player Info Current (unchanged)
0x33 0x36 Face Player Current (unchanged)
0x36 Destroy Entities Current Pre|rel=removed}}
0x34 0x37 Player Position And Look (clientbound) Current Pre
0x35 0x38 Unlock Recipes Current (unchanged)
0x39 Destroy Entity Current Pre|rel=added}}
0x37 0x3A Remove Entity Effect Current (unchanged)
0x38 0x3B Resource Pack Send Current Pre
0x39 0x3C Respawn Current (unchanged)
0x3A 0x3D Entity Head Look Current (unchanged)
0x3B 0x3E Multi Block Change Current (unchanged)
0x3C 0x3F Select Advancement Tab Current (unchanged)
0x40 Action Bar Pre
0x41 World Border Center Pre
0x42 World Border Lerp Size Pre
0x43 World Border Size Pre
0x44 World Border Warning Delay Pre
0x45 World Border Warning Reach Pre
0x3E 0x46 Camera Current (unchanged)
0x3F 0x47 Held Item Change (clientbound) Current (unchanged)
0x40 0x48 Update View Position Current (unchanged)
0x41 0x49 Update View Distance Current (unchanged)
0x42 0x4A Spawn Position Current (unchanged)
0x43 0x4B Display Scoreboard Current (unchanged)
0x44 0x4C Entity Metadata Current (unchanged)
0x45 0x4D Attach Entity Current (unchanged)
0x46 0x4E Entity Velocity Current (unchanged)
0x47 0x4F Entity Equipment Current (unchanged)
0x4F Title Current Pre
0x48 0x50 Set Experience Current (unchanged)
0x49 0x51 Update Health Current (unchanged)
0x4A 0x52 Scoreboard Objective Current (unchanged)
0x4B 0x53 Set Passengers Current (unchanged)
0x4C 0x54 Teams Current (unchanged)
0x4D 0x55 Update Score Current (unchanged)
0x56 Set Title SubTitle Pre
0x57 Time Update Current (unchanged)
0x58 Set Title Text Pre
0x59 Set Title Time Pre
0x50 0x5A Entity Sound Effect Current (unchanged)
0x51 0x5B Sound Effect Current (unchanged)
0x52 0x5C Stop Sound Current (unchanged)
0x53 0x5D Player List Header And Footer Current (unchanged)
0x54 0x5E NBT Query Response Current (unchanged)
0x55 0x5F Collect Item Current (unchanged)
0x56 0x60 Entity Teleport Current (unchanged)
0x57 0x61 Advancements Current (unchanged)
0x58 0x62 Entity Properties Current (unchanged)
0x59 0x63 Entity Effect Current (unchanged)
0x5A 0x64 Declare Recipes Current (unchanged)
0x5B 0x65 Tags Current Pre
Play serverbound
0x05 Client Settings Current Pre
Handshaking serverbound
0x00 Handshake Current Pre

New/modified data types

No changes so far.

Entity Metadata

Warning.png Note that other entities have had metadata shifts due to these changes, not shown here.

Entity

The base class.

Index Type Meaning Default
0 Byte Bit mask Meaning 0
0x01 Is on fire
0x02 Is crouching
0x04 Unused (previously riding)
0x08 Is sprinting
0x10 Is swimming
0x20 Is invisible
0x40 has glowing effect
0x80 Is flying with an elytra
1 VarInt Air ticks 300
2 OptChat Custom name empty
3 Boolean Is custom name visible false
4 Boolean Is silent false
5 Boolean Has no gravity false
6 Pose Pose STANDING
7 VarInt Ticks frozen in powdered snow 0

Block Actions

No changes so far.

Inventories

No changes so far.

Plugin Channels

No changes so far.

Play

Clientbound

Sculk Vibration Signal

Packet ID State Bound To Field Name Field Type Notes
0x05 Play Client Source Position Position Source position for the vibration.
Destination Identifier Identifier Identifier of the destination codec type.
Destination Varies Vanilla default destinations are a block position encoded as a Position for "block" or an entity id encoded as a VarInt for "entity".
Arrival Ticks VarInt Ticks for the signal to arrive at the destination.

This packet shows a permanent particle.

Clear Titles

Packet ID State Bound To Field Name Field Type Notes
0x10 Play Client
Reset Boolean

Initialize World Border

Packet ID State Bound To Field Name Field Type Notes
0x20 Play Client X Double
Z Double
Old Diameter Double Current length of a single side of the world border, in meters.
New Diameter Double Target length of a single side of the world border, in meters.
Speed VarLong Number of real-time milliseconds until New Diameter is reached. It appears that Notchian server does not sync world border speed to game ticks, so it gets out of sync with server lag. If the world border is not moving, this is set to 0.
Portal Teleport Boundary VarInt Resulting coordinates from a portal teleport are limited to ±value. Usually 29999984.
Warning Blocks VarInt In meters.
Warning Time VarInt In seconds as set by /worldborder warning time.

The Notchian client determines how solid to display the warning by comparing to whichever is higher, the warning distance or whichever is lower, the distance from the current diameter to the target diameter or the place the border will be after warningTime seconds. In pseudocode:

distance = max(min(resizeSpeed * 1000 * warningTime, abs(targetDiameter - currentDiameter)), warningDistance);
if (playerDistance < distance) {
    warning = 1.0 - playerDistance / distance;
} else {
    warning = 0.0;
}

Chunk Data

Main article: Chunk Format
See also: #Unload Chunk
Huh.png The following information needs to be added to this page:
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... (/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 Overworld, it's up to the client to know in which dimension 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 later).

Packet ID State Bound To Field Name Field Type Notes
0x20 0x22 Play Client Chunk X Int Chunk coordinate (block coordinate divided by 16, rounded down)
Chunk Z Int Chunk coordinate (block coordinate divided by 16, rounded down)
Full chunk Boolean See Chunk Format
Primary Bit Mask VarInt 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).
Bit Mask Length VarInt Length of the following array
Primary Bit Mask Array of Long BitSet with bits (world height in blocks / 16) 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 the lowest y to 15 blocks above).
Heightmaps NBT Compound containing one long array named MOTION_BLOCKING, 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 WORLD_SURFACE long array, the purpose of which is unknown, but it's not required for the chunk to be accepted.
Biomes length Optional VarInt Size of the following array; should always be 1024. Not present if full chunk is false.
Biomes Optional Array of VarInt 1024 biome IDs, ordered by x then z then y, in 4×4×4 blocks. Not present if full chunk is false. See Chunk Format § Biomes.
Size VarInt Size of Data in bytes
Data Byte array See data structure in Chunk Format
Number of block entities VarInt Number of elements in the following array
Block entities Array of NBT Tag All block entities in the chunk. Use the x, y, and z tags in the NBT to determine their positions.

Note that the Notchian client requires an 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.

The compacted array format has been adjusted so that individual entries no longer span across multiple longs, affecting the main data array and heightmaps.

New format, 5 bits per block, containing the following references to blocks in a palette (not shown): 122344566480743131516914101202

0020863148418841 0000000000100000100001100011000101001000010000011000100001000001
01018A7260F68C87 0000000100000001100010100111001001100000111101101000110010000111

Entity Movement

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.

Packet ID State Bound To Field Name Field Type Notes
0x2A Play Client Entity ID VarInt

Update Light

Updates light levels for a chunk.

Packet ID State Bound To Field Name Field Type Notes
0x23 0x25 Play Client Chunk X VarInt Chunk coordinate (block coordinate divided by 16, rounded down)
Chunk Z VarInt Chunk coordinate (block coordinate divided by 16, rounded down)
Trust Edges Boolean If edges should be trusted for light updates.
Sky Light Mask 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)
Block Light Mask VarInt Mask containing 18 bits, with the same order as sky light
Empty Sky Light Mask 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.
Empty Block Light Mask 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.
Length 1 VarInt Length of the following array
Sky Light Mask Array of Long BitSet containing bits for each sections in the world + 2 (lowest bit 16-1 blocks below min world height, highest 1-16 above max world height)
Length 2 VarInt Length of the following array
Block Light Mask Array of Long BitSet containing bits for each sections in the world + 2, same order as sky light
Length 3 VarInt Length of the following array
Empty Sky Light Mask Array of Long BitSet containing a variable amount of bits (see sky/block light) which indicates sections that have 0 for all their sky light values
Length 4 VarInt Length of the following array
Empty Block Light Mask Array of Long BitSet containing a variable amount of bits (see sky/block light) which indicates sections that have 0 for all their block light values
Sky Light array count VarInt Number of entries in the following array
Sky Light arrays Length Array VarInt Length of the following array in bytes (always 2048)
Sky Light array Array of 2048 bytes 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.
Block Light array count VarInt Number of entries in the following array
Block Light arrays Length Array VarInt Length of the following array in bytes (always 2048)
Block Light array Array of 2048 bytes 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.


Map Data

Updates a rectangular area on a map item.

Packet ID State Bound To Field Name Field Type Notes
0x25 0x27 Play Client Map ID VarInt Map ID of the map being modified
Scale Byte From 0 for a fully zoomed-in map (1 block per pixel) to 4 for a fully zoomed-out map (16 blocks per pixel)
Tracking Position Boolean Specifies whether player and item frame icons are shown
Locked Boolean True if the map has been locked in a cartography table
Tracking Position Boolean Specifies whether player and item frame icons are shown
Icon Count VarInt Number of elements in the following array. Only present if "Tracking Position" is true.
Icon Type Array VarInt enum See below
X Byte Map coordinates: -128 for furthest left, +127 for furthest right
Z Byte Map coordinates: -128 for highest, +127 for lowest
Direction Byte 0-15
Has Display Name Boolean
Display Name Optional Chat Only present if previous Boolean is true
Columns Unsigned Byte Number of columns updated
Rows Optional Byte Only if Columns is more than 0; number of rows updated
X Optional Byte Only if Columns is more than 0; x offset of the westernmost column
Z Optional Byte Only if Columns is more than 0; z offset of the northernmost row
Length Optional VarInt Only if Columns is more than 0; length of the following array
Data Optional Array of Unsigned Byte Only if Columns is more than 0; see Map item format

For icons, a direction of 0 is a vertical icon and increments by 22.5° (360/16).

Types are based off of rows and columns in map_icons.png:

Icon type Result
0 White arrow (players)
1 Green arrow (item frames)
2 Red arrow
3 Blue arrow
4 White cross
5 Red pointer
6 White circle (off-map players)
7 Small white circle (far-off-map players)
8 Mansion
9 Temple
10 White Banner
11 Orange Banner
12 Magenta Banner
13 Light Blue Banner
14 Yellow Banner
15 Lime Banner
16 Pink Banner
17 Gray Banner
18 Light Gray Banner
19 Cyan Banner
20 Purple Banner
21 Blue Banner
22 Brown Banner
23 Green Banner
24 Red Banner
25 Black Banner
26 Treasure marker

Combat Event

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)

Packet ID State Bound To Field Name Field Type Notes
0x31 Play Client Event VarInt Enum Determines the layout of the remaining packet.
Event Field Name
0: enter combat no fields no fields
1: end combat Duration VarInt Length of the combat in ticks.
Entity ID Int ID of the primary opponent of the ended combat, or -1 if there is no obvious primary opponent.
2: entity dead Player ID VarInt Entity ID of the player that died (should match the client's entity ID).
Entity ID Int The killing entity's ID, or -1 if there is no obvious killer.
Message Chat The death message.

End Combat Event

Unused by the Notchain client.

Packet ID State Bound To Field Name Field Type Notes
0x32 Play Client Duration VarInt Length of the combat in ticks.
Entity ID Int ID of the primary opponent of the ended combat, or -1 if there is no obvious primary opponent.

Enter Combat Event

Unused by the Notchain client.

Packet ID State Bound To Field Name Field Type Notes
0x33 Play Client


Death Combat Event

Used to send a respawn screen.

Packet ID State Bound To Field Name Field Type Notes
0x34 Play Client Player ID VarInt Entity ID of the player that died (should match the client's entity ID).
Entity ID Int The killing entity's ID, or -1 if there is no obvious killer.
Message Chat The death message.

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 3.2E7D 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.

Pitch is measured in degrees, where 0 is looking straight ahead, -90 is looking straight up, and 90 is looking straight down.

Packet ID State Bound To Field Name Field Type Notes
0x34 0x38 Play Client X Double Absolute or relative position, depending on Flags.
Y Double Absolute or relative position, depending on Flags.
Z Double Absolute or relative position, depending on Flags.
Yaw Float 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.
Teleport ID VarInt Client should confirm this packet with Teleport Confirm containing the same Teleport ID.
Dismount Vehicle Boolean True if the player should dismount their vehicle.

About the Flags field:

<Dinnerbone> It's a bitfield, X/Y/Z/Y_ROT/X_ROT. If X is set, the x value is relative and not absolute.
Field Bit
X 0x01
Y 0x02
Z 0x04
Y_ROT 0x08
X_ROT 0x10

Destroy Entity

Sent by the server when a list of entities an entity is to be destroyed on the client.

Packet ID State Bound To Field Name Field Type Notes
0x36 Play Client
Count VarInt Number of elements in the following array.
Array of VarInt The list of entities of destroy.
Entity ID VarInt

Resource Pack Send

Packet ID State Bound To Field Name Field Type Notes
0x38 0x3B Play Client URL String (32767) The URL to the resource pack.
Hash String (40) A 40 character hexadecimal and lowercase SHA-1 hash of the resource pack file. (must be lower case in order to work)
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
Forced Boolean The notchian client will be forced to use the resource pack from the server. If they decline they will be kicked from the server.
Forced Message Chat This is sent with the force resourcepack popup.

Title

Packet ID State Bound To Field Name Field Type Notes
0x4F Play Client Action VarInt Enum
Action Field Name
0: set title Title Text Chat
1: set subtitle Subtitle Text Chat
2: set action bar Action bar text Chat Displays a message above the hotbar (the same as position 2 in Chat Message (clientbound).
3: set times and display Fade In Int Ticks to spend fading in.
Stay Int Ticks to keep the title displayed.
Fade Out Int Ticks to spend out, not when to start fading out.
4: hide no fields no fields
5: reset no fields no fields

“Hide” makes the title disappear, but if you run times again the same title will appear. “Reset” erases the text.

The title is visible on screen for Fade In + Stay + Fade Out ticks.

Action Bar

Packet ID State Bound To Field Name Field Type Notes
0x40 Play Client Action bar text Chat Displays a message above the hotbar (the same as position 2 in Chat Message (clientbound).

World Border Center

Packet ID State Bound To Field Name Field Type Notes
0x41 Play Client X Double
Z Double

World Border Lerp Size

Packet ID State Bound To Field Name Field Type Notes
0x42 Play Client Old Diameter Double Current length of a single side of the world border, in meters.
New Diameter Double Target length of a single side of the world border, in meters.
Speed VarLong Number of real-time milliseconds until New Diameter is reached. It appears that Notchian server does not sync world border speed to game ticks, so it gets out of sync with server lag. If the world border is not moving, this is set to 0.

World Border Size

Packet ID State Bound To Field Name Field Type Notes
0x43 Play Client Diameter Double Length of a single side of the world border, in meters.

World Border Warning Delay

Packet ID State Bound To Field Name Field Type Notes
0x44 Play Client Warning Time VarInt In seconds as set by /worldborder warning time.

World Border Warning Reach

Packet ID State Bound To Field Name Field Type Notes
0x45 Play Client Warning Blocks VarInt In meters.

Set Title SubTitle

Packet ID State Bound To Field Name Field Type Notes
0x56 Play Client Subtitle Text Chat


Set Title Text

Packet ID State Bound To Field Name Field Type Notes
0x58 Play Client Title Text Chat

Set Title Time

Packet ID State Bound To Field Name Field Type Notes
0x59 Play Client Fade In Int Ticks to spend fading in.
Stay Int Ticks to keep the title displayed.
Fade Out Int Ticks to spend out, not when to start fading out.


Tags

Packet ID State Bound To Field Name Field Type Notes
0x5B 0x65 Play Client
Block Tags (See below) IDs are block IDs
Item Tags (See below) IDs are item IDs
Fluid Tags (See below) IDs are fluid IDs
Entity Tags (See below) IDs are entity IDs
Length of the array VarInt
Array of tags Tag type Array Identifier Tag identifier (Vanilla required tags are minecraft:block, minecraft:item, minecraft:fluid, minecraft:entity_type, and minecraft:game_event)
Array of Tag (See below)

Tags look like:

Field Name Field Type Notes
Length VarInt Number of elements in the following array
Tags Tag name Array Identifier
Count VarInt Number of elements in the following array
Entries Array of VarInt Numeric ID of the given type (block, item, etc.).


Serverbound

Client Settings

Sent when the player connects, or when settings are changed.

Packet ID State Bound To Field Name Field Type Notes
0x05 Play Server Locale String (16) e.g. en_GB.
View Distance Byte Client-side render distance, in chunks.
Chat Mode VarInt Enum 0: enabled, 1: commands only, 2: hidden. See processing chat for more information.
Chat Colors Boolean “Colors” multiplayer setting.
Displayed Skin Parts Unsigned Byte Bit mask, see below.
Main Hand VarInt Enum 0: Left, 1: Right.
Disable text filtering Boolean Disables filtering of text on signs and written book titles. Currently always true (i.e. the filtering is disabled)

Displayed Skin Parts flags:

  • Bit 0 (0x01): Cape enabled
  • Bit 1 (0x02): Jacket enabled
  • Bit 2 (0x04): Left Sleeve enabled
  • Bit 3 (0x08): Right Sleeve enabled
  • Bit 4 (0x10): Left Pants Leg enabled
  • Bit 5 (0x20): Right Pants Leg enabled
  • Bit 6 (0x40): Hat enabled

The most significant bit (bit 7, 0x80) appears to be unused.


Window Confirmation (serverbound)

If a confirmation sent by the client was not accepted, the server will reply with a Window Confirmation (clientbound) packet with the Accepted field set to false. When this happens, the client must send this packet to apologize (as with movement), otherwise the server ignores any successive confirmations.

Packet ID State Bound To Field Name Field Type Notes
0x07 Play Server Window ID Byte The ID of the window that the action occurred in.
Action Number Short Every action that is to be accepted has a unique number. This number is an incrementing integer (starting at 1) with separate counts for each window ID.
Accepted Boolean Whether the action was accepted.

Handshaking

Clientbound

There are no clientbound packets in the Handshaking state, since the protocol immediately switches to a different state after the client sends the first packet.

Serverbound

Handshake

This causes the server to switch into the target state.

Packet ID State Bound To Field Name Field Type Notes
0x00 Handshaking Server Protocol Version VarInt See protocol version numbers (currently 754 Snapshot 15)
Server Address String 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 Unsigned Short Default is 25565. The Notchian server does not use this information.
Next State VarInt Enum 1 for status, 2 for login

Status

Clientbound

No changes so far.

Serverbound

No changes so far.

Login

Clientbound

No changes so far.

Serverbound

No changes so far.