Pre-release protocol
This page documents the changes from the last stable Minecraft release (currently 1.10.2, protocol 210) to the current pre-release (currently 16w32a, protocol 301). 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
No changes so far.
| ID | Packet name | Documentation | |
|---|---|---|---|
| Handshaking serverbound | |||
| 0x00 | Handshake | Current | Pre |
| Play clientbound | |||
| 0x03 | Spawn Mob | Current | Pre |
| 0x48 | Collect Item | Current | Pre |
New/modified data types
Entity Metadata
AbstractSkeleton
Extends Monster.
| Index | Type | Meaning | |
|---|---|---|---|
| 12 | Boolean | Is swinging arms | |
Skeleton
Extends AbstractSkeleton.
Wither Skeleton
Extends AbstractSkeleton.
Stray
Extends AbstractSkeleton.
Zombie
Extends Monster.
| Index | Type | Meaning | |
|---|---|---|---|
| 12 | Boolean | Is baby | |
| 13 | VarInt | Zombie type (0 for zombie, profession+1 for villagers, 6 for Husk) | |
| 14 | Boolean | Is converting | |
| Boolean | Are hands held up | ||
Zombie Villager
Extends Zombie.
| Index | Type | Meaning | |
|---|---|---|---|
| 15 | Boolean | Is converting | |
| 16 | VarInt | Profession | |
Husk
Extends Zombie.
Guardian
Extends Monster.
| Index | Type | Meaning | |
|---|---|---|---|
| 12 | Byte | Bit mask | Meaning |
| 0x02 | is retracting spikes | ||
| 0x04 | is elderly | ||
| 12 | Boolean | Is retracting spikes | |
| 13 | VarInt | Target EID | |
ElderGuardian
Extends Guardian.
AbstractHorse
Extends Animal.
| Index | Type | Meaning | |
|---|---|---|---|
| 13 | Byte | Bit mask | Meaning |
| 0x01 | Unused | ||
| 0x02 | Is Tame | ||
| 0x04 | Is saddled | ||
| 0x08 | Has Chest | ||
| 0x10 | Is Bred (not used on the Notchian server; controlled via the unused Bred NBT flag) | ||
| 0x20 | Is eating | ||
| 0x40 | Is rearing (on hind legs) | ||
| 0x80 | Is mouth open | ||
| 14 | OptUUID | Owner | |
Horse
Extends AbstractHorse.
| Index | Type | Meaning | |
|---|---|---|---|
| 15 | VarInt | Variant (Color & Style) | |
| 16 | VarInt | Armor | |
ZombieHorse
Extends AbstractHorse.
SkeletonHorse
Extends AbstractHorse.
ChestedHorse
Extends AbstractHorse.
| Index | Type | Meaning | |
|---|---|---|---|
| 15 | Boolean | Has Chest | |
Donkey
Extends ChestedHorse.
Mule
Extends ChestedHorse.
Handshaking
Clientbound
No changes so far.
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 |
| 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. | |||
| 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 |
Play
Clientbound
Spawn Mob
Sent by the server when a mob entity is spawned.
| Packet ID | State | Bound To | Field Name | Field Type | Notes |
|---|---|---|---|---|---|
| 0x03 | Play | Client | Entity ID | VarInt | |
| Entity UUID | UUID | ||||
| Type | The type of mob. See Entities#Mobs | ||||
| X | Double | ||||
| Y | Double | ||||
| Z | Double | ||||
| Yaw | Angle | ||||
| Pitch | Angle | ||||
| Head Pitch | Angle | ||||
| Velocity X | Short | Same units as Entity Velocity | |||
| Velocity Y | Short | Same units as Entity Velocity | |||
| Velocity Z | Short | Same units as Entity Velocity | |||
| Metadata | Entity Metadata |
Collect Item
Sent by the server when someone picks up an item lying on the ground — its sole purpose appears to be the animation of the item flying towards you. It doesn't destroy the entity in the client memory, and it doesn't add it to your inventory. The server only checks for items to be picked up after each Player Position (and Player Position And Look) packet sent by the client.
| Packet ID | State | Bound To | Field Name | Field Type | Notes |
|---|---|---|---|---|---|
| 0x48 | Play | Client | Collected Entity ID | VarInt | |
| Collector Entity ID | VarInt | ||||
| Pickup Item Count | VarInt | Seems to be 1 for XP orbs, otherwise the number of items in the stack. |
Serverbound
No changes so far.
Status
Clientbound
No changes so far.
Serverbound
No changes so far.
Login
Clientbound
No changes so far.
Serverbound
No changes so far.
