Pre-release protocol

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This page documents the changes from the last stable Minecraft release (currently 1.9.4, protocol 110) to the current pre-release (currently 16w21a, protocol 202). 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
Handshaking serverbound
0x00 Handshake Current Pre
Play clientbound
0x19 Named Sound Effect Current Pre
0x46 Sound Effect Current Pre

New/modified data types

Mobs

Mobs are spawned via Spawn Mob. There are two extra mob types in the code that refer to mobs classes that can never spawn: Mob and Monster (they are always subclasses, aka another more specific type).

Type Name x, z y
48 Mob N/A N/A
49 Monster N/A N/A
50 Creeper 0.6 1.8
51 Skeleton 0.6 1.95
52 Spider 1.4 0.9
53 Giant Zombie 0.6 * 6 1.8 * 6
54 Zombie 0.6 1.8
55 Slime 0.51000005 * size 0.51000005 * size
56 Ghast 4 4
57 Zombie Pigman 0.6 1.8
58 Enderman 0.6 2.9
59 Cave Spider 0.7 0.5
60 Silverfish 0.4 0.3
61 Blaze 0.6 1.8
62 Magma Cube 0.51000005 * size 0.51000005 * size
63 Ender Dragon 16.0 8.0
64 Wither 0.9 3.5
65 Bat 0.5 0.9
66 Witch 0.6 1.8
67 Endermite 0.4 0.3
68 Guardian 0.85 0.85
69 Shulker 1 1
90 Pig 0.9 0.9
91 Sheep 0.9 1.3
92 Cow 0.9 1.3
93 Chicken 0.4 0.7
94 Squid 0.95 0.95
95 Wolf 0.6 0.8
96 Mooshroom 0.9 1.3
97 Snowman 0.7 1.9
98 Ocelot 0.6 0.8
99 Iron Golem 1.4 2.9
100 Horse 1.4 1.6
101 Rabbit 0.6 0.7
102 Polar Bear 1.3 1.4
120 Villager 0.6 1.8

Entity Metadata

Note that entity metadata is a totally distinct concept from block metadata. All entities must send at least one item of metadata, in most cases this will be the health item.

An Entity Metadata is an array of entries, each of which looks like the following:

Name Type Meaning
Index Unsigned Byte Unique index key determining the meaning of the following value, see the table below. If this is 0xff then the it is the end of the Entity Metadata array and no more is read.
Type Optional Byte Enum Only if Index is not 0xff; the type of the index, see the table below
Value Optional value of Type Only if Index is not 0xff: the value of the metadata field
Value of Type field Type of Value field Notes
0 Byte
1 VarInt
2 Float
3 String
4 Chat
5 Slot
6 Boolean
7 Rotation 3 floats: rotation on x, rotation on y, rotation on z
8 Position
9 OptPosition (Boolean + Optional Position) Position is present if the Boolean is set to true
10 Direction (VarInt) (Down = 0, Up = 1, North = 2, South = 3, West = 4, East = 5)
11 OptUUID (Boolean + Optional UUID) UUID is present if the Boolean is set to true
12 BlockID (VarInt) id << 4 | data

Entity classes also recursively use fields from classes they extend.

Entity class Index Type Meaning
Entity 0 Byte Bit Mask Meaning
0x01 On Fire
0x02 Crouched
0x08 Sprinting
0x10 Eating/Drinking/Blocking
0x20 Invisible
0x40 Glowing Effect
0x80 Flying with Elytra
1 VarInt Air
2 String Custom Name
3 Boolean Is Custom Name Visible
4 Boolean Is Silent
5 Boolean No Gravity
Potion extends Entity 5 6 Slot Potion which is thrown
FallingBlock extends Entity 5 6 Position Spawn Position
AreaEffectButt extends Entity 5 6 Float Radius
6 7 VarInt Color (only for mob spell particle)
7 8 Boolean Ignore radius and show effect as single point, not area
8 9 VarInt Particle ID
Arrow extends Entity 5 6 Byte Is Critical
TippedArrow extends Arrow 6 7 VarInt Color
Boat extends Entity 5 6 VarInt Time Since Last Hit
6 7 VarInt Forward Direction
7 8 Float Damage Taken
8 9 VarInt Type
9 10 Boolean Right paddle turning
10 11 Boolean Left paddle turning
EnderCrystal extends Entity 5 6 OptPosition Beam Target
6 7 Boolean Show Bottom
Fireball extends Entity no additional metadata
WitherSkull extends Fireball 5 6 Boolean Invulnerable
Fireworks extends Entity 5 6 Slot Firework Info
Hanging extends Entity no additional metadata
ItemFrame extends Hanging 5 6 Slot Item
6 7 VarInt Rotation
Item extends Entity 5 6 Slot Item
Living extends Entity 5 6 Byte Likely used to limit placing blocks from both hands at the same time.
6 7 Float Health
7 8 VarInt Potion Effect Color
8 9 Boolean Is Potion Effect Ambient
9 10 VarInt Number of Arrows in Entity
ArmorStand extends Living
10 11 Byte Status bit mask
11 12 Vector3F Head rotation
12 13 Vector3F Body rotation
13 14 Vector3F Left arm rotation
14 15 Vector3F Right arm rotation
15 16 Vector3F Left leg rotation
16 17 Vector3F Right leg rotation
Insentient extends Living 10 11 Byte Status bit mask (NoAI, Left handed)
Ambient extends Insentient no additional metadata
Bat extends Ambient 11 12 Byte Is Hanging
Creature extends Insentient no additional metadata
Ageable extends Creature 11 12 Boolean Is Baby
PolarBear extends Ageable 13 Boolean Is Standing
Animal extends Ageable no additional metadata
Horse extends Animal 12 13 Byte Status bit mask
13 14 VarInt Type
14 15 VarInt Variant
15 16 OptUUID Owner's UUID
16 17 VarInt Armor
Pig extends Animal 12 13 Boolean Has Saddle
Rabbit extends Animal 12 13 VarInt Type
Sheep extends Animal 12 13 Byte Status bit mask
TameableAnimal extends Animal 12 13 Byte Status bit mask (sitting, tamed)
13 14 OptUUID Owner's UUID
Ocelot extends TameableAnimal 14 15 VarInt Type
Wolf extends TameableAnimal 14 15 Float Damage Taken (used for tail rotation)
15 16 Boolean Is Begging
16 17 VarInt Collar Color
Villager extends Ageable 12 13 VarInt Profession (Farmer = 0, Librarian = 1, Priest = 2, Blacksmith = 3, Butcher = 4)
Golem extends Creature no additional metadata
IronGolem extends Golem 11 12 Byte Is Player Created
Shulker extends Golem 11 12 Direction Facing Direction
12 13 OptPosition Attachment Position
13 14 Byte Shield Height
Monster extends Creature no additional metadata
Blaze extends Monster 11 12 Byte Is On Fire
Creeper extends Monster 11 12 VarInt State (-1 = Idle, 1 = Fuse)
12 13 Boolean Is Powered
13 14 Boolean Is Ignited
Guardian extends Monster 11 12 Byte Status bit mask (elderly, retracting spikes)
12 13 VarInt Target EID
Skeleton extends Monster 11 12 VarInt Type (0 = Default, 1 = Wither, 2 = Stray)
12 13 Boolean Is swinging arms
Spider extends Monster 11 12 Byte Is Climbing
Witch extends Monster 11 12 Boolean Is Aggresive
Wither extends Monster 11 12 VarInt First Head's Target
12 13 VarInt Second Head's Target
13 14 VarInt Third Head's Target
14 15 VarInt Invulnerable Time
Zombie extends Monster 11 12 Boolean Is Baby
12 13 VarInt Is Villager (Profession) Zombie Type (0 = Default, 1-5 = Villager Profession, 6 = Husk)
13 14 Boolean Is Converting
14 15 Boolean Are Hands Rised Up
Enderman extends Monster 11 12 Block ID Carried Block
12 13 Boolean Is Screaming
EnderDragon extends Insentient 11 12 VarInt Dragon Phase
Flying extends Insentient no additional metadata
Ghast extends Flying 11 12 Boolean Is Attacking
Slime extends Insentient 11 12 VarInt Size
Minecart extends Entity 5 6 VarInt Shaking Power
6 7 VarInt Shaking Direction
7 8 Float Shaking Multiplier
8 9 VarInt Block ID and Meta
9 10 VarInt Block Y Position
10 11 Boolean Show Block
MinecartCommandBlock extends Minecart 11 12 String Command
12 13 Chat Last Output
MinecartFurnace extends Minecart 11 12 Boolean Is Powered
TNTPrimed extends Entity 5 6 VarInt Fuse Time

Handshaking

Clientbound

No changes so far.

Serverbound

No changes so far.

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 110 202)
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

Named Sound Effect

See also: #Sound Effect

Used to play a sound effect on the client. Custom sounds may be added by resource packs.

Packet ID State Bound To Field Name Field Type Notes
0x19 Play Client Sound Name String All known sound effect names can be seen here.
Sound Category VarInt Enum The category that this sound will be played from (current categories)
Effect Position X Int Effect X multiplied by 8 (fixed-point number with only 3 bits dedicated to the fractional part)
Effect Position Y Int Effect Y multiplied by 8 (fixed-point number with only 3 bits dedicated to the fractional part)
Effect Position Z Int Effect Z multiplied by 8 (fixed-point number with only 3 bits dedicated to the fractional part)
Volume Float 1 is 100%, can be more
Pitch Unsigned Byte Float 63 is 100%, can be more

Sound Effect

This packet is used to play a number of hardcoded sound events. For custom sounds, use Named Sound Effect (Play, 0x19, clientbound).

Warning.png Numeric sound effect IDs are liable to change between versions

Packet ID State Bound To Field Name Field Type Notes
0x46 Play Client Sound ID VarInt ID of hardcoded sound event (events)
Sound Category VarInt Enum The category that this sound will be played from (current categories)
Effect Position X Int Effect X multiplied by 8 (fixed-point number with only 3 bits dedicated to the fractional part)
Effect Position Y Int Effect Y multiplied by 8 (fixed-point number with only 3 bits dedicated to the fractional part)
Effect Position Z Int Effect Z multiplied by 8 (fixed-point number with only 3 bits dedicated to the fractional part)
Volume Float 1.0 is 100%, capped between 0.0 and 1.0 by Notchian clients
Pitch Unsigned Byte Float Float multiplied by 63.5, capped between 0.5 and 2.0 by Notchian clients

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.