This page documents the changes from the last stable Minecraft release (currently 1.20.4, protocol 765) to the current pre-release (currently 24w13a, protocol Snapshot 182). 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
|
| Handshake serverbound
|
| 0x00 |
Handshake |
Current |
Pre
|
| Login clientbound
|
| 0x01 |
Encryption Request |
Current |
Pre
|
| 0x05 |
Cookie Request (login) |
|
Pre
|
| Login serverbound
|
| 0x04 |
Cookie Response (login) |
|
Pre
|
| Configuration clientbound
|
| 0x00 |
Cookie Request (configuration) |
|
Pre
|
0x00 0x01 |
Clientbound Plugin Message (configuration) |
Current |
(unchanged)
|
0x01 0x02 |
Disconnect (configuration) |
Current |
(unchanged)
|
0x02 0x03 |
Finish Configuration |
Current |
(unchanged)
|
0x03 0x04 |
Clientbound Keep Alive (configuration) |
Current |
(unchanged)
|
0x04 0x05 |
Ping (configuration) |
Current |
(unchanged)
|
| 0x06 |
Reset Chat |
|
Pre
|
0x05 0x07 |
Registry Data |
Current |
Pre
|
0x06 0x08 |
Remove Resource Pack (configuration) |
Current |
(unchanged)
|
0x07 0x09 |
Add Resource Pack (configuration) |
Current |
(unchanged)
|
| 0x0A |
Store Cookie (configuration) |
|
Pre
|
| 0x0B |
Transfer (configuration) |
|
Pre
|
0x08 0x0C |
Feature Flags |
Current |
(unchanged)
|
0x09 0x0D |
Update Tags (configuration) |
Current |
(unchanged)
|
| 0x0E |
Clientbound Known Packs |
|
Pre
|
| Configuration serverbound
|
| 0x01 |
Cookie Response (configuration) |
|
Pre
|
0x01 0x02 |
Serverbound Plugin Message (configuration) |
Current |
(unchanged)
|
0x02 0x03 |
Finish Configuration |
Current |
(unchanged)
|
0x03 0x04 |
Serverbound Keep Alive (configuration) |
Current |
(unchanged)
|
0x04 0x05 |
Pong (configuration) |
Current |
(unchanged)
|
0x05 0x06 |
Resource Pack Response (configuration) |
Current |
(unchanged)
|
| 0x07 |
Serverbound Known Packs |
|
Pre
|
| Play clientbound
|
| 0x16 |
Cookie Request (Play) |
|
Pre
|
0x16 0x17 |
Set Cooldown |
Current |
(unchanged)
|
0x17 0x18 |
Chat Suggestions |
Current |
(unchanged)
|
0x18 0x19 |
Clientbound Plugin Message (play) |
Current |
(unchanged)
|
0x19 0x1A |
Damage Event |
Current |
(unchanged)
|
| 0x1B |
Debug Sample |
|
Pre
|
0x1A 0x1C |
Delete Message |
Current |
(unchanged)
|
0x1B 0x1D |
Disconnect (play) |
Current |
(unchanged)
|
0x1C 0x1E |
Disguised Chat Message |
Current |
(unchanged)
|
0x1D 0x1F |
Entity Event |
Current |
(unchanged)
|
0x1E 0x20 |
Explosion |
Current |
(unchanged)
|
0x1F 0x21 |
Unload Chunk |
Current |
(unchanged)
|
0x20 0x22 |
Game Event |
Current |
(unchanged)
|
0x21 0x23 |
Open Horse Screen |
Current |
(unchanged)
|
0x22 0x24 |
Hurt Animation |
Current |
(unchanged)
|
0x23 0x25 |
Initialize World Border |
Current |
(unchanged)
|
0x24 0x26 |
Clientbound Keep Alive (play) |
Current |
(unchanged)
|
0x25 0x27 |
Chunk Data and Update Light |
Current |
(unchanged)
|
0x26 0x28 |
World Event |
Current |
(unchanged)
|
0x27 0x29 |
Particle |
Current |
(unchanged)
|
0x28 0x2A |
Update Light |
Current |
(unchanged)
|
0x29 0x2B |
Login (play) |
Current |
Pre
|
0x2A 0x2C |
Map Data |
Current |
(unchanged)
|
0x2B 0x2D |
Merchant Offers |
Current |
(unchanged)
|
0x2C 0x2E |
Update Entity Position |
Current |
(unchanged)
|
0x2D 0x2F |
Update Entity Position and Rotation |
Current |
(unchanged)
|
0x2E 0x30 |
Update Entity Rotation |
Current |
(unchanged)
|
0x2F 0x31 |
Move Vehicle |
Current |
(unchanged)
|
0x30 0x32 |
Open Book |
Current |
(unchanged)
|
0x31 0x33 |
Open Screen |
Current |
(unchanged)
|
0x32 0x34 |
Open Sign Editor |
Current |
(unchanged)
|
0x33 0x35 |
Ping (play) |
Current |
(unchanged)
|
0x34 0x36 |
Ping Response (play) |
Current |
(unchanged)
|
0x35 0x37 |
Place Ghost Recipe |
Current |
(unchanged)
|
0x36 0x38 |
Player Abilities |
Current |
(unchanged)
|
0x37 0x39 |
Player Chat Message |
Current |
(unchanged)
|
0x38 0x3A |
End Combat |
Current |
(unchanged)
|
0x39 0x3B |
Enter Combat |
Current |
(unchanged)
|
0x3A 0x3C |
Combat Death |
Current |
(unchanged)
|
0x3B 0x3D |
Player Info Remove |
Current |
(unchanged)
|
0x3C 0x3E |
Player Info Update |
Current |
(unchanged)
|
0x3D 0x3F |
Look At |
Current |
(unchanged)
|
0x3E 0x40 |
Synchronize Player Position |
Current |
(unchanged)
|
0x3F 0x41 |
Update Recipe Book |
Current |
(unchanged)
|
0x40 0x42 |
Remove Entities |
Current |
(unchanged)
|
0x41 0x43 |
Remove Entity Effect |
Current |
(unchanged)
|
0x42 0x44 |
Reset Score |
Current |
(unchanged)
|
0x43 0x45 |
Remove Resource Pack (play) |
Current |
(unchanged)
|
0x44 0x46 |
Add Resource Pack (play) |
Current |
(unchanged)
|
0x45 0x47 |
Respawn |
Current |
Pre
|
0x46 0x48 |
Set Head Rotation |
Current |
(unchanged)
|
0x47 0x49 |
Update Section Blocks |
Current |
(unchanged)
|
0x48 0x4A |
Select Advancements Tab |
Current |
(unchanged)
|
0x49 0x4B |
Server Data |
Current |
(unchanged)
|
0x4A 0x4C |
Set Action Bar Text |
Current |
(unchanged)
|
0x4B 0x4D |
Set Border Center |
Current |
(unchanged)
|
0x4C 0x4E |
Set Border Lerp Size |
Current |
(unchanged)
|
0x4D 0x4F |
Set Border Size |
Current |
(unchanged)
|
0x4E 0x50 |
Set Border Warning Delay |
Current |
(unchanged)
|
0x4F 0x51 |
Set Border Warning Distance |
Current |
(unchanged)
|
0x50 0x52 |
Set Camera |
Current |
(unchanged)
|
0x51 0x53 |
Set Held Item |
Current |
(unchanged)
|
0x52 0x54 |
Set Center Chunk |
Current |
(unchanged)
|
0x53 0x55 |
Set Render Distance |
Current |
(unchanged)
|
0x54 0x56 |
Set Default Spawn Position |
Current |
(unchanged)
|
0x55 0x57 |
Display Objective |
Current |
(unchanged)
|
0x56 0x58 |
Set Entity Metadata |
Current |
(unchanged)
|
0x57 0x59 |
Link Entities |
Current |
(unchanged)
|
0x58 0x5A |
Set Entity Velocity |
Current |
(unchanged)
|
0x59 0x5B |
Set Equipment |
Current |
(unchanged)
|
0x5A 0x5C |
Set Experience |
Current |
(unchanged)
|
0x5B 0x5D |
Set Health |
Current |
(unchanged)
|
0x5C 0x5E |
Update Objectives |
Current |
(unchanged)
|
0x5D 0x5F |
Set Passengers |
Current |
(unchanged)
|
0x5E 0x60 |
Update Teams |
Current |
(unchanged)
|
0x5F 0x61 |
Update Score |
Current |
(unchanged)
|
0x60 0x62 |
Set Simulation Distance |
Current |
(unchanged)
|
0x61 0x63 |
Set Subtitle Text |
Current |
(unchanged)
|
0x62 0x64 |
Update Time |
Current |
(unchanged)
|
0x63 0x65 |
Set Title Text |
Current |
(unchanged)
|
0x64 0x66 |
Set Title Animation Times |
Current |
(unchanged)
|
0x65 0x67 |
Entity Sound Effect |
Current |
(unchanged)
|
0x66 0x68 |
Sound Effect |
Current |
(unchanged)
|
0x67 0x69 |
Start Configuration |
Current |
(unchanged)
|
0x68 0x6A |
Stop Sound |
Current |
(unchanged)
|
| 0x6B |
Store Cookie (Play) |
|
Pre
|
0x69 0x6C |
System Chat Message |
Current |
(unchanged)
|
0x6A 0x6D |
Set Tab List Header And Footer |
Current |
(unchanged)
|
0x6B 0x6E |
Tag Query Response |
Current |
(unchanged)
|
0x6C 0x6F |
Pickup Item |
Current |
(unchanged)
|
0x6D 0x70 |
Teleport Entity |
Current |
(unchanged)
|
0x6E 0x71 |
Set Ticking State |
Current |
(unchanged)
|
0x6F 0x72 |
Step Tick |
Current |
(unchanged)
|
| 0x73 |
Transfer (Play) |
|
Pre
|
0x70 0x74 |
Update Advancements |
Current |
(unchanged)
|
0x71 0x75 |
Update Attributes |
Current |
Pre
|
0x72 0x76 |
Entity Effect |
Current |
Pre
|
0x73 0x77 |
Update Recipes |
Current |
(unchanged)
|
0x74 0x78 |
Update Tags (play) |
Current |
(unchanged)
|
| Play serverbound
|
| 0x04 |
Chat Command |
Current |
Pre
|
| 0x05 |
Signed Chat Command |
|
Pre
|
0x05 0x06 |
Chat Message |
Current |
(unchanged)
|
0x06 0x07 |
Player Session |
Current |
(unchanged)
|
0x07 0x08 |
Chunk Batch Received |
Current |
(unchanged)
|
0x08 0x09 |
Client Status |
Current |
(unchanged)
|
0x09 0x0A |
Client Information (play) |
Current |
(unchanged)
|
0x0A 0x0B |
Command Suggestions Request |
Current |
(unchanged)
|
0x0B 0x0C |
Acknowledge Configuration |
Current |
(unchanged)
|
0x0C 0x0D |
Click Container Button |
Current |
(unchanged)
|
0x0D 0x0E |
Click Container |
Current |
(unchanged)
|
0x0E 0x0F |
Close Container |
Current |
(unchanged)
|
0x0F 0x10 |
Change Container Slot State |
Current |
(unchanged)
|
| 0x11 |
Cookie Response (play) |
|
Pre
|
0x10 0x12 |
Serverbound Plugin Message (play) |
Current |
(unchanged)
|
| 0x13 |
Debug Sample Subscription |
|
Pre
|
0x11 0x14 |
Edit Book |
Current |
(unchanged)
|
0x12 0x15 |
Query Entity Tag |
Current |
(unchanged)
|
0x13 0x16 |
Interact |
Current |
(unchanged)
|
0x14 0x17 |
Jigsaw Generate |
Current |
(unchanged)
|
0x15 0x18 |
Serverbound Keep Alive (play) |
Current |
(unchanged)
|
0x16 0x19 |
Lock Difficulty |
Current |
(unchanged)
|
0x17 0x1A |
Set Player Position |
Current |
(unchanged)
|
0x18 0x1B |
Set Player Position and Rotation |
Current |
(unchanged)
|
0x19 0x1C |
Set Player Rotation |
Current |
(unchanged)
|
0x1A 0x1D |
Set Player On Ground |
Current |
(unchanged)
|
0x1B 0x1E |
Move Vehicle |
Current |
(unchanged)
|
0x1C 0x1F |
Paddle Boat |
Current |
(unchanged)
|
0x1D 0x20 |
Pick Item |
Current |
(unchanged)
|
0x1E 0x21 |
Ping Request (play) |
Current |
(unchanged)
|
0x1F 0x22 |
Place Recipe |
Current |
(unchanged)
|
0x20 0x23 |
Player Abilities |
Current |
(unchanged)
|
0x21 0x24 |
Player Action |
Current |
(unchanged)
|
0x22 0x25 |
Player Command |
Current |
(unchanged)
|
0x23 0x26 |
Player Input |
Current |
(unchanged)
|
0x24 0x27 |
Pong (play) |
Current |
(unchanged)
|
0x25 0x28 |
Change Recipe Book Settings |
Current |
(unchanged)
|
0x26 0x29 |
Set Seen Recipe |
Current |
(unchanged)
|
0x27 0x2A |
Rename Item |
Current |
(unchanged)
|
0x28 0x2B |
Resource Pack Response (play) |
Current |
(unchanged)
|
0x29 0x2C |
Seen Advancements |
Current |
(unchanged)
|
0x2A 0x2D |
Select Trade |
Current |
(unchanged)
|
0x2B 0x2E |
Set Beacon Effect |
Current |
(unchanged)
|
0x2C 0x2F |
Set Held Item |
Current |
(unchanged)
|
0x2D 0x30 |
Program Command Block |
Current |
(unchanged)
|
0x2E 0x31 |
Program Command Block Minecart |
Current |
(unchanged)
|
0x2F 0x32 |
Set Creative Mode Slot |
Current |
(unchanged)
|
0x30 0x33 |
Program Jigsaw Block |
Current |
(unchanged)
|
0x31 0x34 |
Program Structure Block |
Current |
(unchanged)
|
0x32 0x35 |
Update Sign |
Current |
(unchanged)
|
0x33 0x36 |
Swing Arm |
Current |
(unchanged)
|
0x34 0x37 |
Teleport To Entity |
Current |
(unchanged)
|
0x35 0x38 |
Use Item On |
Current |
(unchanged)
|
0x36 0x39 |
Use Item |
Current |
(unchanged)
|
New/modified data types
No changes so far.
Entity Metadata
| Type
|
Name
|
Value
|
Notes
|
| 0
|
Byte
|
Byte
|
|
| 1
|
VarInt
|
VarInt
|
|
| 2
|
VarLong
|
VarLong
|
|
| 3
|
Float
|
Float
|
|
| 4
|
String
|
String
|
|
| 5
|
Text Component
|
Text Component
|
|
| 6
|
Optional Text Component
|
(Boolean, Optional Text Component)
|
Text Component is present if the Boolean is set to true.
|
| 7
|
Slot
|
Slot
|
|
| 8
|
Boolean
|
Boolean
|
|
| 9
|
Rotations
|
(Float, Float, Float)
|
rotation on x, rotation on y, rotation on z
|
| 10
|
Position
|
Position
|
|
| 11
|
Optional Position
|
(Boolean, Optional Position)
|
Position is present if the Boolean is set to true.
|
| 12
|
Direction
|
VarInt Enum
|
Down = 0, Up = 1, North = 2, South = 3, West = 4, East = 5
|
| 13
|
Optional UUID
|
(Boolean, Optional UUID)
|
UUID is present if the Boolean is set to true.
|
| 14
|
Block State
|
VarInt
|
An ID in the block state registry.
|
| 15
|
Optional Block State
|
VarInt
|
0 for absent (air is unrepresentable); otherwise, an ID in the block state registry.
|
| 16
|
NBT
|
NBT
|
|
| 17
|
Particle
|
(VarInt, Varies)
|
particle type (an ID in the minecraft:particle_type registry), particle data (See Particles.)
|
| 18
|
Particles
|
(VarInt, Array of Particle)
|
length of array, particle data (See directly above.)
|
18 19
|
Villager Data
|
(VarInt, VarInt, VarInt)
|
villager type, villager profession, level (See below.)
|
19 20
|
Optional VarInt
|
VarInt
|
0 for absent; 1 + actual value otherwise. Used for entity IDs.
|
20 21
|
Pose
|
VarInt Enum
|
STANDING = 0, FALL_FLYING = 1, SLEEPING = 2, SWIMMING = 3, SPIN_ATTACK = 4, SNEAKING = 5, LONG_JUMPING = 6, DYING = 7, CROAKING = 8, USING_TONGUE = 9, SITTING = 10, ROARING = 11, SNIFFING = 12, EMERGING = 13, DIGGING = 14, SLIDING = 15, SHOOTING = 16, INHALING = 17
|
21 22
|
Cat Variant
|
VarInt
|
An ID in the minecraft:cat_variant registry.
|
22 23
|
Wolf Variant
|
VarInt
|
An ID in the minecraft:wolf_variant registry.
|
22 24
|
Frog Variant
|
VarInt
|
An ID in the minecraft:frog_variant registry.
|
23 25
|
Optional Global Position
|
(Boolean, Optional Identifier, Optional Position)
|
dimension identifier, position; only if the Boolean is set to true.
|
24 26
|
Painting Variant
|
VarInt
|
An ID in the minecraft:painting_variant registry.
|
25 27
|
Sniffer State
|
VarInt Enum
|
IDLING = 0, FEELING_HAPPY = 1, SCENTING = 2, SNIFFING = 3, SEARCHING = 4, DIGGING = 5, RISING = 6
|
26 28
|
Armadillo State
|
VarInt Enum
|
IDLE = 0, ROLLING = 1, SCARED = 2
|
26 29
|
Vector3
|
(Float, Float, Float)
|
x, y, z
|
27 30
|
Quaternion
|
(Float, Float, Float, Float)
|
x, y, z, w
|
Living Entity
TODO: This has changed to use the PARTICLES attribute
Wolf
Extends Tameable Animal.Inherited entity Tameable Animal does not existInherited entity Tameable Animal does not exist
Armadillo
Extends Animal.
Block Actions
No changes so far.
Inventories
No changes so far.
Plugin Channels
No changes so far.
Handshake
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 765 in Minecraft 1.20.4).
|
| Server Address
|
String (255)
|
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 simple redirect, e.g. if _minecraft._tcp.example.com points to mc.example.org, users connecting to example.com will provide 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, 3 for Transfer.
|
Status
Clientbound
No changes so far.
Serverbound
No changes so far.
Login
Clientbound
Encryption Request
| Packet ID
|
State
|
Bound To
|
Field Name
|
Field Type
|
Notes
|
| 0x01
|
Login
|
Client
|
Server ID
|
String (20)
|
Appears to be empty.
|
| Public Key Length
|
VarInt
|
Length of Public Key.
|
| Public Key
|
Byte Array
|
The server's public key, in bytes.
|
| Verify Token Length
|
VarInt
|
Length of Verify Token. Always 4 for Notchian servers.
|
| Verify Token
|
Byte Array
|
A sequence of random bytes generated by the server.
|
| Should Authenticate
|
Boolean
|
|
Cookie Request (login)
Requests a cookie that was previously stored.
| Packet ID
|
State
|
Bound To
|
Field Name
|
Field Type
|
Notes
|
| 0x05
|
Login
|
Client
|
Key
|
Identifier
|
The identifier of the cookie.
|
Serverbound
Cookie Response (login)
Response to a Cookie Request (login) from the server. The Notchian server only accepts responses of up to 5 kiB in size.
| Packet ID
|
State
|
Bound To
|
Field Name
|
Field Type
|
Notes
|
| 0x04
|
Login
|
Server
|
Key
|
Identifier
|
The identifier of the cookie.
|
| Has Payload
|
Boolean
|
The payload is only present if the cookie exists on the client.
|
| Payload Length
|
VarInt
|
Length of the following byte array.
|
| Payload
|
Optional Byte Array (5120)
|
The data of the cookie, if any.
|
Configuration
Clientbound
Cookie Request (configuration)
Requests a cookie that was previously stored.
| Packet ID
|
State
|
Bound To
|
Field Name
|
Field Type
|
Notes
|
| 0x00
|
Configuration
|
Client
|
Key
|
Identifier
|
The identifier of the cookie.
|
Reset Chat
| Packet ID
|
State
|
Bound To
|
Field Name
|
Field Type
|
Notes
|
| 0x06
|
Configuration
|
Client
|
no fields
|
Registry Data
Represents certain registries that are sent from the server and are applied on the client. The packet is sent for each of the following registries: minecraft:worldgen/biome, minecraft:chat_type, minecraft:trim_pattern, minecraft:trim_material, minecraft:wolf_variant, minecraft:dimension_type, minecraft:damage_type, and minecraft:banner_pattern.
| Packet ID
|
State
|
Bound To
|
Field Name
|
Field Type
|
Notes
|
| 0x07
|
Configuration
|
Client
|
Registry Codec
|
NBT (Compound)
|
See Registry Data.
|
| Registry ID
|
Identifier
|
|
| Entry Count
|
VarInt
|
Number of entries in the following array.
|
| Entries
|
Entry ID
|
Array
|
Identifier
|
|
| Has Data
|
Boolean
|
Whether the entry has any data following.
|
| Data
|
NBT Tag
|
Entry data. Only present if Has Data is true.
|
Store Cookie (configuration)
Stores some arbitrary data on the client, which persists between server transfers. The Notchian client only accepts cookies of up to 5 kiB in size.
| Packet ID
|
State
|
Bound To
|
Field Name
|
Field Type
|
Notes
|
| 0x0A
|
Configuration
|
Client
|
Key
|
Identifier
|
The identifier of the cookie.
|
| Payload
|
ByteArray(5120)
|
The data of the cookie.
|
Transfer (configuration)
Notifies the client that it should transfer to the given server. Cookies previously stored are preserved between server transfers.
| Packet ID
|
State
|
Bound To
|
Field Name
|
Field Type
|
Notes
|
| 0x0B
|
Configuration
|
Client
|
Host
|
String
|
The hostname of IP of the server.
|
| Port
|
VarInt
|
The port of the server.
|
Clientbound Known Packs
| Packet ID
|
State
|
Bound To
|
Field Name
|
Field Type
|
Notes
|
| 0x0E
|
Configuration
|
Client
|
Known Pack Count
|
VarInt
|
The number of known packs in the following array.
|
| Known Packs
|
Namespace
|
Array
|
String
|
|
| ID
|
String
|
|
| Version
|
String
|
|
Serverbound
Cookie Response (configuration)
Response to a Cookie Request (configuration) from the server. The Notchian server only accepts responses of up to 5 kiB in size.
| Packet ID
|
State
|
Bound To
|
Field Name
|
Field Type
|
Notes
|
| 0x01
|
Configuration
|
Server
|
Key
|
Identifier
|
The identifier of the cookie.
|
| Has Payload
|
Boolean
|
The payload is only present if the cookie exists on the client.
|
| Payload Length
|
VarInt
|
Length of the following byte array.
|
| Payload
|
Optional Byte Array (5120)
|
The data of the cookie, if any.
|
Serverbound Known Packs
ID 0x07, same structure as Clientbound Known Packs. If the client specifies a pack in this packet, the server should omit its contained data from Registry Data.
Play
Clientbound
Cookie Request (play)
Requests a cookie that was previously stored.
| Packet ID
|
State
|
Bound To
|
Field Name
|
Field Type
|
Notes
|
| 0x16
|
Play
|
Client
|
Key
|
Identifier
|
The identifier of the cookie.
|
Debug Sample
| Packet ID
|
State
|
Bound To
|
Field Name
|
Field Type
|
Notes
|
| 0x1B
|
Play
|
Client
|
Sample Length
|
VarInt
|
The length of the following array.
|
| Sample
|
Long Array
|
TODO: What is the structure of the data in this array?
|
| Sample Type
|
VarInt Enum
|
The type of sample data. Currently always 0 (TICK_TIME).
|
Login (play)
| Packet ID
|
State
|
Bound To
|
Field Name
|
Field Type
|
Notes
|
| 0x2B
|
Play
|
Client
|
Entity ID
|
Int
|
The player's Entity ID (EID).
|
| Is hardcore
|
Boolean
|
|
| Dimension Count
|
VarInt
|
Size of the following array.
|
| Dimension Names
|
Array of Identifier
|
Identifiers for all dimensions on the server.
|
| Max Players
|
VarInt
|
Was once used by the client to draw the player list, but now is ignored.
|
| View Distance
|
VarInt
|
Render distance (2-32).
|
| Simulation Distance
|
VarInt
|
The distance that the client will process specific things, such as entities.
|
| Reduced Debug Info
|
Boolean
|
If true, a Notchian client shows reduced information on the debug screen. For servers in development, this should almost always be false.
|
| Enable respawn screen
|
Boolean
|
Set to false when the doImmediateRespawn gamerule is true.
|
| Do limited crafting
|
Boolean
|
Whether players can only craft recipes they have already unlocked. Currently unused by the client.
|
| Dimension Type
|
Identifier VarInt
|
The ID of the type of dimension in the minecraft:dimension_type registry, defined by the Registry Data packet.
|
| Dimension Name
|
Identifier
|
Name of the dimension being spawned into.
|
| Hashed seed
|
Long
|
First 8 bytes of the SHA-256 hash of the world's seed. Used client side for biome noise
|
| Game mode
|
Unsigned Byte
|
0: Survival, 1: Creative, 2: Adventure, 3: Spectator.
|
| Previous Game mode
|
Byte
|
-1: Undefined (null), 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. The previous game mode. Vanilla client uses this for the debug (F3 + N & F3 + F4) game mode switch. (More information needed)
|
| Is Debug
|
Boolean
|
True if the world is a debug mode world; debug mode worlds cannot be modified and have predefined blocks.
|
| Is Flat
|
Boolean
|
True if the world is a superflat world; flat worlds have different void fog and a horizon at y=0 instead of y=63.
|
| Has death location
|
Boolean
|
If true, then the next two fields are present.
|
| Death dimension name
|
Optional Identifier
|
Name of the dimension the player died in.
|
| Death location
|
Optional Position
|
The location that the player died at.
|
| Portal cooldown
|
VarInt
|
The number of ticks until the player can use the portal again.
|
| Enforces Secure Chat
|
Boolean
|
|
Respawn
| Packet ID
|
State
|
Bound To
|
Field Name
|
Field Type
|
Notes
|
| 0x47
|
Play
|
Client
|
Dimension Type
|
Identifier VarInt
|
The ID of the type of dimension in the minecraft:dimension_type registry, defined by the Registry Data packet.
|
| Dimension Name
|
Identifier
|
Name of the dimension being spawned into.
|
| Hashed seed
|
Long
|
First 8 bytes of the SHA-256 hash of the world's seed. Used client side for biome noise
|
| Game mode
|
Unsigned Byte
|
0: Survival, 1: Creative, 2: Adventure, 3: Spectator.
|
| Previous Game mode
|
Byte
|
-1: Undefined (null), 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. The previous game mode. Vanilla client uses this for the debug (F3 + N & F3 + F4) game mode switch. (More information needed)
|
| Is Debug
|
Boolean
|
True if the world is a debug mode world; debug mode worlds cannot be modified and have predefined blocks.
|
| Is Flat
|
Boolean
|
True if the world is a superflat world; flat worlds have different void fog and a horizon at y=0 instead of y=63.
|
| Has death location
|
Boolean
|
If true, then the next two fields are present.
|
| Death dimension Name
|
Optional Identifier
|
Name of the dimension the player died in.
|
| Death location
|
Optional Position
|
The location that the player died at.
|
| Portal cooldown
|
VarInt
|
The number of ticks until the player can use the portal again.
|
| Data kept
|
Byte
|
Bit mask. 0x01: Keep attributes, 0x02: Keep metadata. Tells which data should be kept on the client side once the player has respawned.
In the Notchian implementation, this is context dependent:
- normal respawns (after death) keep no data;
- exiting the end poem/credits keeps the attributes;
- other dimension changes (portals or teleports) keep all data.
|
Store Cookie (play)
Stores some arbitrary data on the client, which persists between server transfers. The Notchian client only accepts cookies of up to 5 kiB in size.
| Packet ID
|
State
|
Bound To
|
Field Name
|
Field Type
|
Notes
|
| 0x6B
|
Play
|
Client
|
Key
|
Identifier
|
The identifier of the cookie.
|
| Payload Length
|
VarInt
|
Length of the following byte array.
|
| Payload
|
Byte Array (5120)
|
The data of the cookie.
|
Transfer (play)
Notifies the client that it should transfer to the given server. Cookies previously stored are preserved between server transfers.
| Packet ID
|
State
|
Bound To
|
Field Name
|
Field Type
|
Notes
|
| 0x73
|
Play
|
Client
|
Host
|
String
|
The hostname of IP of the server.
|
| Port
|
VarInt
|
The port of the server.
|
Update Attributes
Sets attributes on the given entity.
| Packet ID
|
State
|
Bound To
|
Field Name
|
Field Type
|
Notes
|
| 0x71
|
Play
|
Client
|
Entity ID
|
VarInt
|
|
| Number Of Properties
|
VarInt
|
Number of elements in the following array.
|
| Property
|
Key Id
|
Array
|
Identifier VarInt Enum
|
See below.
|
| Value
|
Double
|
See below.
|
| Number Of Modifiers
|
VarInt
|
Number of elements in the following array.
|
| Modifiers
|
Array of Modifier Data
|
See Attribute#Modifiers. Modifier Data defined below.
|
Known Key values (see also Attribute#Modifiers):
These changed between 24w03b and 24w13a, TODO: Update this
| Id
|
Key
|
Default
|
Min
|
Max
|
Label
|
| 0
|
generic.armor
|
0.0
|
0.0
|
30.0
|
Armor.
|
| 1
|
generic.armor_toughness
|
0.0
|
0.0
|
20.0
|
Armor Toughness.
|
| 2
|
generic.attack_damage
|
2.0
|
0.0
|
2048.0
|
Attack Damage.
|
| 3
|
generic.attack_knockback
|
0.0
|
0.0
|
5.0
|
Attack Knockback.
|
| 4
|
generic.attack_speed
|
4.0
|
0.0
|
1024.0
|
Attack Speed.
|
| 5
|
generic.block_interaction_range
|
4.5
|
0.0
|
64.0
|
Block Interaction Range.
|
| 6
|
generic.entity_interaction_range
|
3.0
|
0.0
|
64.0
|
Entity Interaction Range.
|
| 7
|
generic.flying_speed
|
0.4
|
0.0
|
1024.0
|
Flying Speed.
|
| 8
|
generic.follow_range
|
32.0
|
0.0
|
2048.0
|
Follow Range.
|
| 9
|
horse.jump_strength
|
0.7
|
0.0
|
2.0
|
Jump Strength.
|
| 10
|
generic.knockback_resistance
|
0.0
|
0.0
|
1.0
|
Knockback Resistance.
|
| 11
|
generic.luck
|
0.0
|
-1024.0
|
1024.0
|
Luck.
|
| 12
|
generic.max_absorption
|
0.0
|
0.0
|
2048.0
|
Max Absorption.
|
| 13
|
generic.max_health
|
20.0
|
1.0
|
1024.0
|
Max Health.
|
| 14
|
generic.movement_speed
|
0.7
|
0.0
|
1024.0
|
Movement Speed.
|
| 15
|
generic.scale
|
1.0
|
0.0625
|
16.0
|
Scale.
|
| 16
|
zombie.spawn_reinforcements
|
0.0
|
0.0
|
1.0
|
Spawn Reinforcements Chance.
|
| 17
|
generic.step_height
|
0.6
|
0.0
|
10.0
|
Step Height.
|
Modifier Data structure:
| Field Name
|
Field Type
|
Notes
|
| UUID
|
UUID
|
|
| Amount
|
Double
|
May be positive or negative.
|
| Operation
|
Byte
|
See below.
|
The operation controls how the base value of the modifier is changed.
- 0: Add/subtract amount
- 1: Add/subtract amount percent of the current value
- 2: Multiply by amount percent
All of the 0's are applied first, and then the 1's, and then the 2's.
Entity Effect
| Packet ID
|
State
|
Bound To
|
Field Name
|
Field Type
|
Notes
|
| 0x72
|
Play
|
Client
|
Entity ID
|
VarInt
|
|
| Effect ID
|
VarInt
|
See this table.
|
| Amplifier
|
Byte
|
Notchian client displays effect level as Amplifier + 1.
|
| Duration
|
VarInt
|
Duration in ticks. (-1 for infinite)
|
| Flags
|
Byte
|
Bit field, see below.
|
| Has Factor Data
|
Boolean
|
Used in DARKNESS effect
|
| Factor Codec
|
NBT Tag
|
See below
|
 |
The following information needs to be added to this page:
|
| What exact effect does the blend bit flag have on the client? What happens if it is used on effects besides DARKNESS?
|
Within flags:
- 0x01: Is ambient - was the effect spawned from a beacon? All beacon-generated effects are ambient. Ambient effects use a different icon in the HUD (blue border rather than gray). If all effects on an entity are ambient, the "Is potion effect ambient" living metadata field should be set to true. Usually should not be enabled.
- 0x02: Show particles - should all particles from this effect be hidden? Effects with particles hidden are not included in the calculation of the effect color, and are not rendered on the HUD (but are still rendered within the inventory). Usually should be enabled.
- 0x04: Show icon - should the icon be displayed on the client? Usually should be enabled.
- 0x08: Blend - should the effect's hard-coded blending be applied? Currently only used in the DARKNESS effect to apply extra void fog and adjust the gamma value for lighting.
Factor Data
| Name
|
Type
|
Notes
|
| padding_duration
|
TAG_INT
|
|
| factor_start
|
TAG_FLOAT
|
|
| factor_target
|
TAG_FLOAT
|
|
| factor_current
|
TAG_FLOAT
|
|
| effect_changed_timestamp
|
TAG_INT
|
| factor_previous_frame
|
TAG_FLOAT
|
| had_effect_last_tick
|
TAG_BOOLEAN
|
Serverbound
Chat Command
| Packet ID
|
State
|
Bound To
|
Field Name
|
Field Type
|
Notes
|
| 0x04
|
Play
|
Server
|
Command
|
String (256)
|
The command typed by the client.
|
| Timestamp
|
Long
|
The timestamp that the command was executed.
|
| Salt
|
Long
|
The salt for the following argument signatures.
|
| Array length
|
VarInt
|
Number of entries in the following array. The maximum length in Notchian server is 8.
|
| Array of argument signatures
|
Argument name
|
Array (8)
|
String (16)
|
The name of the argument that is signed by the following signature.
|
| Signature
|
Byte Array (256)
|
The signature that verifies the argument. Always 256 bytes and is not length-prefixed.
|
| Message Count
|
VarInt
|
|
| Acknowledged
|
Fixed BitSet (20)
|
|
Signed Chat Command
| Packet ID
|
State
|
Bound To
|
Field Name
|
Field Type
|
Notes
|
| 0x05
|
Play
|
Server
|
Command
|
String(256)
|
The command typed by the client.
|
| Timestamp
|
Long
|
The timestamp that the command was executed. Milliseconds since the Unix epoch.
|
| Salt
|
Long
|
The salt for the following argument signatures.
|
| Argument Signature Count
|
VarInt
|
Number of elements in the following array. The maximum length in Notchian server is 8.
|
| Argument Signatures
|
Name
|
Array
|
String(16)
|
The name of the argument that is signed by the following signature.
|
| Signature
|
ByteArray(256)
|
The signature that verifies the argument. Always 256 bytes and is not length-prefixed.
|
| Seen Messages Offset
|
VarInt
|
|
| Seen Messages Acknowledged
|
Fixed BitSet(20)
|
|
Cookie Response (play)
Response to a Cookie Request (play) from the server. The Notchian server only accepts responses of up to 5 kiB in size.
| Packet ID
|
State
|
Bound To
|
Field Name
|
Field Type
|
Notes
|
| 0x11
|
Play
|
Server
|
Key
|
Identifier
|
The identifier of the cookie.
|
| Has Payload
|
Boolean
|
The payload is only present if the cookie exists on the client.
|
| Payload Length
|
Optional VarInt
|
Length of the following byte array.
|
| Payload
|
Optional Byte Array (5120)
|
The data of the cookie, if any.
|
Debug Sample Subscription
| Packet ID
|
State
|
Bound To
|
Field Name
|
Field Type
|
Notes
|
| 0x13
|
Play
|
Server
|
Sample Type
|
VarInt Enum
|
The type of debug sample to subscribe to. Currently always 0 (TICK_TIME).
|
