Pre-release protocol
This page documents the changes from the last stable Minecraft release (currently 1.1) to the current pre-release (currently 12w03a)
Contents
New packets
Entity Head Look (0x23)
Changes the direction an entity's head is facing.
| Packet ID | Field Name | Field Type | Example | Notes |
|---|---|---|---|---|
| 0x23 | Entity ID | int | ||
| Head Yaw | byte | Head yaw in steps of 2π/256 | ||
| Total Size: | 6 bytes | |||
Update Tile Entity (0x84)
Essentially a block update on a tile entity.
| Packet ID | Field Name | Field Type | Example | Notes |
|---|---|---|---|---|
| 0x84 | X | int | ||
| Y | short | |||
| Z | int | |||
| Action | byte | The type of update to perform | ||
| Custom 1 | int | Varies | ||
| Custom 2 | int | Varies | ||
| Custom 3 | int | Varies | ||
| Total Size: | 24 bytes | |||
Actions
- 1: Set mob displayed inside a mob spawner. Custom 1 contains the mob type
Changed packets
Handshake (0x02)
Client to Server
This needs confirmation!
| Packet ID | Field Name | Field Type | Example | Notes |
|---|---|---|---|---|
| 0x02 | UsernameAndHost | string | TkTech;localhost:25565
|
The username of the player attempting to connect, and the host he is connecting to, seperated by a semicolon. |
| Total Size: | 3 bytes + length of strings | |||
Mob Spawn (0x18)
New byte field: head yaw
This needs confirmation!
| Packet ID | Field Name | Field Type | Example | Notes |
|---|---|---|---|---|
| 0x18 | EID | int | 446
|
Entity ID |
| Type | byte | 91
|
The type of mob. See Entities#Mobs | |
| X | int | 13366
|
The Absolute Integer X Position of the object | |
| Y | int | 2176
|
The Absolute Integer Y Position of the object | |
| Z | int | 1680
|
The Absolute Integer Z Position of the object | |
| Yaw | byte | -27
|
The yaw in steps of 2π/256 | |
| Pitch | byte | 0
|
The pitch in steps of 2π/256 | |
| Head Yaw | byte | Head yaw in steps of 2π/256 | ||
| Metadata | Metadata | 127
|
Varies by mob, see Entities | |
| Total Size: | 21 bytes + Metadata (at least 1) | |||
Other changes
Protocol version is now 25.
Protocol History
2012-02-09
- 12w06a
- Protocol version is now 25
- New packet: 0x84
2012-01-26
- 12w04a
- Protocol version has not been changed
- Handshake Packet by client (0x02) now contains the server host and port
- Window Open Packet (0x64): WindowTitle is now longer than accepted by older clients. Contains a keyword such as "container.furnace"
2012-01-19
- 12w03a
- Protocol version is now 24
- New packet: 0x23
- MobSpawn: new field, 1 byte inserted before metadata.
