Pre-release protocol

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This page documents the changes from the 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. 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

13w36a - Added sound category byte to 0x3E - Changed 0xC8 to a string:int map

13w37b -

1.6.3 - Terrain fixes to help moving to 1.7, no packet changes from 1.6.2

1.6.4 -

13w38a/b/c -

13w39a/b - UUIDs added to spawn named entity, game state 'gamemode' byte -> float

13w41a - Large protocol work

Protocol Version

13w41a -

13w39a/b - 80

13w38a/b/c - 79

1.6.4 - 78

1.6.3 - 77

13w37b - 76

13w36a - 75

Packet format

Field Name Field Type Notes
Length VarInt
Type VarInt
Data

Data Types

VarInt -

String - UTF-8 String

Handshaking

Serverbound

?

Packet ID Field Name Field Type Notes
0x00 VarInt
String
VarInt
VarInt

Play

Clientbound

Keep Alive

Packet ID Field Name Field Type Notes
0x00 Keep Alive ID Int


Join Game

Packet ID Field Name Field Type Notes
0x01 Entity ID Int The player's Entity ID
Level type String level-type in server.properties
Gamemode 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
Byte
Max Players Byte Used by the client to draw the player list

Chat Message

Packet ID Field Name Field Type Notes
0x02 JSON Data String https://gist.github.com/thinkofdeath/e882ce057ed83bac0a1c

Time Update

Packet ID Field Name Field Type Notes
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

Packet ID Field Name Field Type Notes
0x04 EntityID Int Entity's ID
Slot Short Equipment slot: 0=held, 1-4=armor slot (1 - boots, 2 - leggings, 3 - chestplate, 4 - helmet)
Item Slot Item in slot format

Spawn Position

Packet ID Field Name Field Type Notes
0x05 X Int Spawn X in block coordinates
Y Int Spawn Y in block coordinates
Z Int in block coordinates

Update Health

Packet ID Field Name Field Type Notes
0x06 Health Float 0 or less = dead, 20 = full HP
Food Short 0 - 20
Food Saturation Float Seems to vary from 0.0 to 5.0 in integer increments

Respawn

Packet ID Field Name Field Type Notes
0x07 Dimension Int -1: The Nether, 0: The Overworld, 1: The End
Difficulty Byte 0 thru 3 for Peaceful, Easy, Normal, Hard.
Gamemode Byte 0: survival, 1: creative, 2: adventure. The hardcore flag is not included
World Height Short Defaults to 256
Level Type String

Status

Login

Plugin Channels

MC|RPack

Field Name Field Type Example Notes
Resource pack URL UTF8 string http://example.com/pack.zip