Pre-release protocol

This page documents the changes from the last stable Minecraft release (currently 1.12.2, protocol 340) to the current pre-release (currently 1.13.1, protocol 401). 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
0x04	Spawn Painting	Current	Pre
0x07	Statistics	Current	Pre
0x09	Update Block Entity	Current	Pre
0x0B	Block Change	Current	Pre
0x0C	Boss Bar	Current	Pre
0x0F 0x0E	Chat Message (clientbound)	Current	(unchanged)
0x10 0x0F	Multi Block Change	Current	Pre
0x0E 0x10	Tab-Complete (clientbound)	Current	Pre
0x11	Declare Commands		Pre
0x11 0x12	Confirm Transaction (clientbound)	Current	(unchanged)
0x12 0x13	Close Window (clientbound)	Current	(unchanged)
0x13 0x14	Open Window	Current	(unchanged)
0x14 0x15	Window Items	Current	(unchanged)
0x15 0x16	Window Property	Current	(unchanged)
0x16 0x17	Set Slot	Current	(unchanged)
0x17 0x18	Set Cooldown	Current	(unchanged)
0x18 0x19	Plugin Message (clientbound)	Current	Pre
0x19 0x1A	Named Sound Effect	Current	Pre
0x1A 0x1B	Disconnect (play)	Current	(unchanged)
0x1B 0x1C	Entity Status	Current	(unchanged)
0x1D	NBT Query Response		Pre
0x1C 0x1E	Explosion	Current	(unchanged)
0x1D 0x1F	Unload Chunk	Current	(unchanged)
0x1E 0x20	Change Game State	Current	(unchanged)
0x1F 0x21	Keep Alive (clientbound)	Current	(unchanged)
0x20 0x22	Chunk Data	Current	Pre
0x21 0x23	Effect	Current	Pre
0x22 0x24	Spawn Particle	Current	Pre
0x23 0x25	Join Game	Current	(unchanged)
0x24 0x26	Map	Current	Pre
0x25 0x27	Entity	Current	(unchanged)
0x26 0x28	Entity Relative Move	Current	(unchanged)
0x27 0x29	Entity Look And Relative Move	Current	(unchanged)
0x28 0x2A	Entity Look	Current	(unchanged)
0x29 0x2B	Vehicle Move (clientbound)	Current	(unchanged)
0x2A 0x2C	Open Sign Editor	Current	(unchanged)
0x2B 0x2D	Craft Recipe Response	Current	Pre
0x2C 0x2E	Player Abilities (clientbound)	Current	(unchanged)
0x2D 0x2F	Combat Event	Current	(unchanged)
0x2E 0x30	Player List Item	Current	(unchanged)
0x31	Face Player		Pre
0x2F 0x32	Player Position And Look (clientbound)	Current	(unchanged)
0x30 0x33	Use Bed	Current	(unchanged)
0x31 0x34	Unlock Recipes	Current	Pre
0x32 0x35	Destroy Entities	Current	(unchanged)
0x33 0x36	Remove Entity Effect	Current	(unchanged)
0x34 0x37	Resource Pack Send	Current	(unchanged)
0x35 0x38	Respawn	Current	(unchanged)
0x36 0x39	Entity Head Look	Current	(unchanged)
0x37 0x3A	Select Advancement Tab	Current	(unchanged)
0x38 0x3B	World Border	Current	(unchanged)
0x39 0x3C	Camera	Current	(unchanged)
0x3A 0x3D	Held Item Change (clientbound)	Current	(unchanged)
0x3B 0x3E	Display Scoreboard	Current	(unchanged)
0x3C 0x3F	Entity Metadata	Current	(unchanged)
0x3D 0x40	Attach Entity	Current	(unchanged)
0x3E 0x41	Entity Velocity	Current	(unchanged)
0x3F 0x42	Entity Equipment	Current	(unchanged)
0x40 0x43	Set Experience	Current	(unchanged)
0x41 0x44	Update Health	Current	(unchanged)
0x42 0x45	Scoreboard Objective	Current	Pre
0x43 0x46	Set Passengers	Current	(unchanged)
0x44 0x47	Teams	Current	Pre
0x45 0x48	Update Score	Current	(unchanged)
0x46 0x49	Spawn Position	Current	(unchanged)
0x47 0x4A	Time Update	Current	(unchanged)
0x48 0x4B	Title	Current	(unchanged)
0x4C	Stop Sound		Pre
0x49 0x4D	Sound Effect	Current	(unchanged)
0x4A 0x4E	Player List Header And Footer	Current	(unchanged)
0x4B 0x4F	Collect Item	Current	(unchanged)
0x4C 0x50	Entity Teleport	Current	(unchanged)
0x4D 0x51	Advancements	Current	(unchanged)
0x4E 0x52	Entity Properties	Current	(unchanged)
0x4F 0x53	Entity Effect	Current	(unchanged)
0x54	Declare Recipes		Pre
0x55	Tags		Pre
Play serverbound
0x01	Query Block NBT		Pre
0x01 0x05	Tab-Complete (serverbound)	Current	Pre
0x05 0x06	Confirm Transaction (serverbound)	Current	(unchanged)
0x06 0x07	Enchant Item	Current	(unchanged)
0x07 0x08	Click Window	Current	(unchanged)
0x08 0x09	Close Window (serverbound)	Current	(unchanged)
0x09 0x0A	Plugin message (serverbound)	Current	Pre
0x0B	Edit Book		Pre
0x0C	Query Entity NBT		Pre
0x0A 0x0D	Use Entity	Current	(unchanged)
0x0B 0x0E	Keep Alive (serverbound)	Current	(unchanged)
0x0C 0x0F	Player	Current	(unchanged)
0x0D 0x10	Player Position	Current	(unchanged)
0x0E 0x11	Player Position And Look (serverbound)	Current	(unchanged)
0x0F 0x12	Player Look	Current	(unchanged)
0x10 0x13	Vehicle Move (serverbound)	Current	(unchanged)
0x11 0x14	Steer Boat	Current	(unchanged)
0x15	Pick Item		Pre
0x12 0x16	Craft Recipe Request	Current	Pre
0x13 0x17	Player Abilities (serverbound)	Current	(unchanged)
0x14 0x18	Player Digging	Current	(unchanged)
0x15 0x19	Entity Action	Current	(unchanged)
0x16 0x1A	Steer Vehicle	Current	(unchanged)
0x17 0x1B	Recipe Book Data	Current	Pre
0x1C	Name Item		Pre
0x18 0x1D	Resource Pack Status	Current	(unchanged)
0x19 0x1E	Advancement Tab	Current	(unchanged)
0x1F	Select Trade		Pre
0x20	Set Beacon Effect		Pre
0x1A 0x21	Held Item Change (serverbound)	Current	(unchanged)
0x22	Update Command Block		Pre
0x23	Update Command Block Minecart		Pre
0x1B 0x24	Creative Inventory Action	Current	(unchanged)
0x25	Update Structure Block		Pre
0x1C 0x26	Update Sign	Current	(unchanged)
0x1D 0x27	Animation (serverbound)	Current	(unchanged)
0x1E 0x28	Spectate	Current	(unchanged)
0x1F 0x29	Player Block Placement	Current	(unchanged)
0x20 0x2A	Use Item	Current	(unchanged)
Login clientbound
0x04	Login Plugin Request		Pre
Login serverbound
0x02	Login Plugin Response		Pre

New/modified data types

No changes so far.

Entity Metadata Format

No changes so far.

Block Actions

No changes so far.

Play

Clientbound

Spawn Painting

This packet shows location, name, and type of painting.

Packet ID	State	Bound To	Field Name	Field Type	Notes
0x04	Play	Client	Entity ID	VarInt
			Entity UUID	UUID
			Motive	String (13) VarInt	Name of the painting. Max length 13 Panting's ID, see below
			Location	Position	Center coordinates (see below)
			Direction	Byte Enum	Direction the painting faces (North = 2, South = 0, West = 1, East = 3)

Calculating the center of an image: given a (width × height) grid of cells, with (0, 0) being the top left corner, the center is (max(0, width / 2 - 1), height / 2). E.g. (1, 0) for a 2×1 painting, or (1, 2) for a 4×4 painting.

List of paintings by coordinates in paintings_kristoffer_zetterstrand.png (where x and y are in pixels from the top left and width and height are in pixels or 16ths of a block):

Name	ID	x	y	width	height
Kebab minecraft:kebab	0	0	0	16	16
Aztec minecraft:aztec	1	16	0	16	16
Alban minecraft:alban	2	32	0	16	16
Aztec2 minecraft:aztec2	3	48	0	16	16
Bomb minecraft:bomb	4	64	0	16	16
Plant minecraft:plant	5	80	0	16	16
Wasteland minecraft:wasteland	6	96	0	16	16
Pool minecraft:pool	7	0	32	32	16
Courbet minecraft:courbet	8	32	32	32	16
Sea minecraft:sea	9	64	32	32	16
Sunset minecraft:sunset	10	96	32	32	16
Creebet minecraft:creebet	11	128	32	32	16
Wanderer minecraft:wanderer	12	0	64	16	32
Graham minecraft:graham	13	16	64	16	32
Match minecraft:match	14	0	128	32	32
Bust minecraft:bust	15	32	128	32	32
Stage minecraft:stage	16	64	128	32	32
Void minecraft:void	17	96	128	32	32
SkullAndRoses skull_and_roses	18	128	128	32	32
Wither minecraft:wither	19	160	128	32	32
Fighters minecraft:fighters	20	0	96	64	32
Pointer minecraft:pointer	21	0	192	64	64
Pigscene minecraft:pigscene	22	64	192	64	64
BurningSkull minecraft:burning_skull	23	128	192	64	64
Skeleton minecraft:skeleton	24	192	64	64	48
DonkeyKong minecraft:donkey_kong	25	192	112	64	48

The Minecraft Wiki article on paintings also provides a list of painting names to the actual images.

Statistics

Sent as a response to Client Status (id 1).

Packet ID	State	Bound To	Field Name		Field Type		Notes
0x07	Play	Client	Count		VarInt		Number of elements in the following array
			Statistic	Name	Array	String (32767)	https://gist.github.com/Alvin-LB/8d0d13db00b3c00fd0e822a562025eff
				Category ID		VarInt	See below
				Statistic ID		VarInt	See below
				Value		VarInt	The amount to set it to

Categories (these are namespaced, but with :. replaced with .):

Name	ID	Registry
minecraft.mined	0	Blocks
minecraft.crafted	1	Items
minecraft.used	2	Items
minecraft.broken	3	Items
minecraft.picked_up	4	Items
minecraft.dropped	5	Items
minecraft.killed	6	Entities
minecraft.killed_by	7	Entities
minecraft.custom	8	Custom

Blocks, Items, and Entities use block (not block state), item, and entity ids.

Custom has the following (unit only matters for clients):

Name	ID	Unit
minecraft.leave_game	0	None
minecraft.play_one_minute	1	Time
minecraft.time_since_death	2	Time
minecraft.sneak_Time	3	Time
minecraft.walk_one_cm	4	Distance
minecraft.crouch_one_cm	5	Distance
minecraft.sprint_one_cm	6	Distance
minecraft.swim_one_cm	7	Distance
minecraft.fall_one_cm	8	Distance
minecraft.climb_one_cm	9	Distance
minecraft.fly_one_cm	10	Distance
minecraft.dive_one_cm	11	Distance
minecraft.minecart_one_cm	12	Distance
minecraft.boat_one_cm	13	Distance
minecraft.pig_one_cm	14	Distance
minecraft.horse_one_cm	15	Distance
minecraft.aviate_one_cm	16	Distance
minecraft.jump	17	None
minecraft.drop	18	None
minecraft.damage_dealt	19	Damage
minecraft.damage_taken	20	Damage
minecraft.deaths	21	None
minecraft.mob_kills	22	None
minecraft.animals_bred	23	None
minecraft.player_kills	24	None
minecraft.fish_caught	25	None
minecraft.talked_to_villager	26	None
minecraft.traded_with_villager	27	None
minecraft.eat_cake_slice	28	None
minecraft.fill_cauldron	29	None
minecraft.use_cauldron	30	None
minecraft.clean_armor	31	None
minecraft.clean_banner	32	None
minecraft.interact_with_brewingstand	33	None
minecraft.interact_with_beacon	34	None
minecraft.inspect_dropper	35	None
minecraft.inspect_hopper	36	None
minecraft.inspect_dispenser	37	None
minecraft.play_noteblock	38	None
minecraft.tune_noteblock	39	None
minecraft.pot_flower	40	None
minecraft.trigger_trapped_chest	41	None
minecraft.open_enderchest	42	None
minecraft.enchant_item	43	None
minecraft.play_record	44	None
minecraft.interact_with_furnace	45	None
minecraft.interact_with_crafting_table	46	None
minecraft.open_chest	47	None
minecraft.sleep_in_bed	48	None
minecraft.open_shulker_box	49	None

Units:

• None: just a normal number (formatted with 0 decimal places)
• Damage: value is 10 times the normal amount
• Distance: a distance in centimeters (hundredths of blocks)
• Time: a time span in ticks

Update Block Entity

Sets tile entity associated with the block at the given location.

Packet ID	State	Bound To	Field Name	Field Type	Notes
0x09	Play	Client	Location	Position
			Action	Unsigned Byte	The type of update to perform, see below
			NBT Data	NBT Tag	Data to set. May be a TAG_END (0), in which case the block entity at the given location is removed (though this is not required since the client will remove the block entity automatically on chunk unload or block removal)

Action field:

• 1: Set data of a mob spawner (everything except for SpawnPotentials: current delay, min/max delay, mob to be spawned, spawn count, spawn range, etc.)
• 2: Set command block text (command and last execution status)
• 3: Set the level, primary, and secondary powers of a beacon
• 4: Set rotation and skin of mob head
• 5: Set type of flower in flower pot
• 5: Declare a conduit
• 6: Set base color and patterns on a banner
• 7: Set the data for a Structure tile entity
• 8: Set the destination for a end gateway
• 9: Set the text on a sign
• 10: Declare a shulker box, no data appears to be sent and the client seems to do fine without this packet. Perhaps it is a leftover from earlier versions?
• 11: Set the color of a bed Declare a bed

Block Change

Fired whenever a block is changed within the render distance.

Changing a block in a chunk that is not loaded is not a stable action. The Notchian client currently uses a shared empty chunk which is modified for all block changes in unloaded chunks; while in 1.9 this chunk never renders in older versions the changed block will appear in all copies of the empty chunk. Servers should avoid sending block changes in unloaded chunks and clients should ignore such packets.

Packet ID	State	Bound To	Field Name	Field Type	Notes
0x0B	Play	Client	Location	Position	Block Coordinates
			Block ID	VarInt	The new block state ID for the block as given in the global palette. (When reading data: type = id >> 4, meta = id & 15, when writing data: id = type << 4 | (meta & 15)) See that section for more information.

Boss Bar

Packet ID	State	Bound To	Field Name		Field Type	Notes
0x0C	Play	Client	UUID		UUID	Unique ID for this bar
			Action		VarInt Enum	Determines the layout of the remaining packet
			Action	Field Name
			0: add	Title	Chat
				Health	Float	From 0 to 1. Values greater than 1 do not crash a Notchian client, and start rendering part of a second health bar at around 1.5.
				Color	VarInt Enum	Color ID (see below)
				Division	VarInt Enum	Type of division (see below)
				Flags	Unsigned Byte	Bit mask. 0x1: should darken sky, 0x2: is dragon bar (used to play end music), 0x04: create fog (previously was also controlled by 0x02)
			1: remove	no fields	no fields	Removes this boss bar
			2: update health	Health	Float	as above
			3: update title	Title	Chat
			4: update style	Color	VarInt Enum	Color ID (see below)
				Dividers	VarInt Enum	as above
			5: update flags	Flags	Unsigned Byte	as above

ID	Color
0	Pink
1	Blue
2	Red
3	Green
4	Yellow
5	Purple
6	White

ID	Type of division
0	No division
1	6 notches
2	10 notches
3	12 notches
4	20 notches

Multi Block Change

Fired whenever 2 or more blocks are changed within the same chunk on the same tick.

Changing blocks in chunks not loaded by the client is unsafe (see note on Block Change).

Packet ID	State	Bound To	Field Name		Field Type		Notes
0x10 0x0F	Play	Client	Chunk X		Int		Chunk X coordinate
			Chunk Z		Int		Chunk Z coordinate
			Record Count		VarInt		Number of elements in the following array, i.e. the number of blocks affected
			Record	Horizontal Position	Array	Unsigned Byte	The 4 most significant bits (0xF0) encode the X coordinate, relative to the chunk. The 4 least significant bits (0x0F) encode the Z coordinate, relative to the chunk.
				Y Coordinate		Unsigned Byte	Y coordinate of the block
				Block ID		VarInt	The new block state ID for the block as given in the global palette. (When reading data: type = id >> 4, meta = id & 15, when writing data: id = type << 4 | (meta & 15)) See that section for more information.

To decode the position into a world position:

worldX = (horizPos >> 4 & 15) + (chunkX * 16);
worldY = vertPos;
worldZ = (horizPos & 15) + (chunkZ * 16);

Tab-Complete (clientbound)

Used to respond to the client's previous tab complete request.

Packet ID	State	Bound To	Field Name		Field Type		Notes
0x0E 0x10	Play	Client	Transaction Id		VarInt		This id should also be used in the tab completion response packet, or it will be ignored.
			Start		VarInt		Start of the text to replace
			Length		VarInt		Length of the text to replace
			Count		VarInt		Number of elements in the following array
			Matches	Match	Array	String (32767)	One eligible command value to insert, note that each command is sent separately instead of in a single string, hence the need for Count. Note that for instance this doesn't include a leading / on commands.
				Has tooltip		Boolean	True if the following is present
				Tooltip		Optional Chat	Tooltip to display; only present if previous Boolean is true

Plugin Message (clientbound)

Main article: Plugin channels

Mods and plugins can use this to send their data. Minecraft itself uses a number of plugin channels. These internal channels are prefixed with MC|.

More documentation on this: http://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/

Packet ID	State	Bound To	Field Name	Field Type	Notes
0x18 0x19	Play	Client	Channel	String (20) Identifier	Name of the plugin channel used to send the data
			Data	Byte Array	Any data, depending on the channel. MC| channels are documented here. The length of this array must be inferred from the packet length.

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 0x1A	Play	Client	Sound Name	String (256) Identifier	All sound effect names as of 1.13-pre8 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	Float	Float between 0.5 and 2.0 by Notchian clients

Effect

Sent when a client is to play a sound or particle effect.

By default, the Minecraft client adjusts the volume of sound effects based on distance. The final boolean field is used to disable this, and instead the effect is played from 2 blocks away in the correct direction. Currently this is only used for effect 1023 (wither spawn) and effect 1028 (enderdragon death); it is ignored on other effects.

Packet ID	State	Bound To	Field Name	Field Type	Notes
0x21 0x23	Play	Client	Effect ID	Int	The ID of the effect, see below
			Location	Position	The location of the effect
			Data	Int	Extra data for certain effects, see below
			Disable Relative Volume	Boolean	See above

Effect IDs:

ID	Name	Data
Sound
1000	Dispenser dispenses
1001	Dispenser fails to dispense
1002	Dispenser shoots
1003	Ender eye launched
1004	Firework shot
1005	Iron door opened
1006	Wooden door opened
1007	Wooden trapdoor opened
1008	Fence gate opened
1009	Fire extinguished
1010	Play record	Special case, see below for more info
1011	Iron door closed
1012	Wooden door closed
1013	Wooden trapdoor closed
1014	Fence gate closed
1015	Ghast warns
1016	Ghast shoots
1017	Enderdragon shoots
1018	Blaze shoots
1019	Zombie attacks wood door
1020	Zombie attacks iron door
1021	Zombie breaks wood door
1022	Wither breaks block
1023	Wither spawned
1024	Wither shoots
1025	Bat takes off
1026	Zombie infects
1027	Zombie villager converted
1028	Ender dragon death
1029	Anvil destroyed
1030	Anvil used
1031	Anvil landed
1032	Portal travel
1033	Chorus flower grown
1034	Chorus flower died
1035	Brewing stand brewed
1036	Iron trapdoor opened
1037	Iron trapdoor closed
Particle
2000	Spawns 10 smoke particles, e.g. from a fire	Direction, see below
2001	Block break + block break sound	Block state, determined by meta << 12 | block id (this differs from normal global palette use) as an index into the global palette
2002	Splash potion. Particle effect + glass break sound.	Potion ID
2003	Eye of Ender entity break animation — particles and sound
2004	Mob spawn particle effect: smoke + flames
2005	Bonemeal particles	How many particles to spawn (if set to 0, 15 are spawned)
2006	Dragon breath
2007	Instant splash potion	Potion ID
3000	End gateway spawn
3001	Enderdragon growl

Smoke directions:

ID	Direction
0	South-East
1	South
2	South-West
3	East
4	(Up or middle ?)
5	West
6	North-East
7	North
8	North-West

Play record: This is actually a special case within this packet. You can start/stop a record at a specific location. Use a valid Record ID to start a record (or overwrite a currently playing one), any other value will stop the record. While this packet still uses item IDs, item IDs have changed in 1.13.

Spawn Particle

Displays the named particle

Packet ID	State	Bound To	Field Name	Field Type	Notes
0x22 0x24	Play	Client	Particle ID	Int	The particle ID listed in #Particle.
			Long Distance	Boolean	If true, particle distance increases from 256 to 65536
			X	Float	X position of the particle
			Y	Float	Y position of the particle
			Z	Float	Z position of the particle
			Offset X	Float	This is added to the X position after being multiplied by random.nextGaussian()
			Offset Y	Float	This is added to the Y position after being multiplied by random.nextGaussian()
			Offset Z	Float	This is added to the Z position after being multiplied by random.nextGaussian()
			Particle Data	Float	The data of each particle
			Particle Count	Int	The number of particles to create
			Data	Array of VarInt Varies	Length depends on particle. "iconcrack" has length of 2, "blockcrack", "blockdust", and "fallingdust" have lengths of 1, the rest have 0. The variable data listed in #Particle

Map

Updates a rectangular area on a map item.

Packet ID	State	Bound To	Field Name		Field Type		Notes
0x24 0x26	Play	Client	Item Damage		VarInt		The damage value (map ID) of the map being modified
			Scale		Byte		From 0 for a fully zoomed-in map (1 block per pixel) to 4 for a fully zoomed-out map (16 blocks per pixel)
			Tracking Position		Boolean		Specifies whether the icons are shown
			Icon Count		VarInt		Number of elements in the following array
			Icon	Direction And Type Type	Array	Byte VarInt enum	0xF0 = Type, 0x0F = Direction Type (see below)
				X		Byte
				Z		Byte
				Direction		Byte	0-15
				Has Display Name		Boolean
				Display Name		Optional Chat	Only present if previous Boolean is true
			Columns		Byte		Number of columns updated
			Rows		Optional Byte		Only if Columns is more than 0; number of rows updated
			X		Optional Byte		Only if Columns is more than 0; x offset of the westernmost column
			Z		Optional Byte		Only if Columns is more than 0; z offset of the northernmost row
			Length		Optional VarInt		Only if Columns is more than 0; length of the following array
			Data		Optional Array of Unsigned Byte		Only if Columns is more than 0; see Map item format

For icons, a direction of 0 is a vertical icon and increments by 22.5° (360/16).

Types are based off of rows and columns in map_icons.png:

Icon type	Result
0	White arrow (players)
1	Green arrow (item frames)
2	Red arrow
3	Blue arrow
4	White cross
5	Red pointer
6	White circle (off-map players)
7	Small white circle (far-off-map players)
8	Mansion
9	Temple
10	White Banner
11	Orange Banner
12	Magenta Banner
13	Light Blue Banner
14	Yellow Banner
15	Lime Banner
16	Pink Banner
17	Gray Banner
18	Light Gray Banner
19	Cyan Banner
20	Purple Banner
21	Blue Banner
22	Brown Banner
23	Green Banner
24	Red Banner
25	Black Banner
26	Treasure marker

Craft Recipe Response

Response to the serverbound packet (Craft Recipe Request), with the same recipe ID. Appears to be used to notify the UI.

Packet ID	State	Bound To	Field Name	Field Type	Notes
0x2B 0x2D	Play	Client	Window ID	Byte
			Recipe	VarInt Identifer	A recipe ID

Unlock Recipes

Packet ID	State	Bound To	Field Name	Field Type	Notes
0x31 0x34	Play	Client
			Action	VarInt	0: init, 1: add, 2: remove
			Crafting Recipe Book Open	Boolean	If true, then the crafting recipe book will be open when the player opens its inventory.
			Crafting Recipe Book Filter Active	Boolean	If true, then the filtering option is active when the players opens its inventory.
			Smelting Recipe Book Open	Boolean	If true, then the smelting recipe book will be open when the player opens its inventory.
			Smelting Recipe Book Filter Active	Boolean	If true, then the filtering option is active when the players opens its inventory.
			Array size 1	VarInt	Number of elements in the following array
			Recipe IDs	Array of VarInt Identifier
			Array size 2	Optional VarInt	Number of elements in the following array, only present if mode is 0 (init)
			Recipe IDs	Optional Array of VarInt Identifier, only present if mode is 0 (init)

Action:

• 0 (init) = All the recipes in the list 2 will added to the recipe book. All the recipes in list 1 will be tagged as displayed, recipes that aren't tagged will be shown in the notification. VERIFY LIST ORDER?
• 1 (add) = All the recipes in the list are added and their icon will be shown in the notification.
• 2 (remove) = Remove all the recipes in the list. This allows them to re-displayed when they are readded.

Scoreboard Objective

This is sent to the client when it should create a new scoreboard objective or remove one.

Packet ID	State	Bound To	Field Name	Field Type	Notes
0x42 0x45	Play	Client	Objective Name	String (16)	An unique name for the objective
			Mode	Byte	0 to create the scoreboard. 1 to remove the scoreboard. 2 to update the display text.
			Objective Value	Optional String (32) Chat	Only if mode is 0 or 2. The text to be displayed for the score
			Type	Optional String VarInt Enum	Only if mode is 0 or 2. “integer” or “hearts”

Teams

Creates and updates teams.

Packet ID	State	Bound To	Field Name		Field Type	Notes
0x44 0x47	Play	Client	Team Name		String (16)	A unique name for the team. (Shared with scoreboard).
			Mode		Byte	Determines the layout of the remaining packet
			0: create team	Team Display Name	String (32) Chat
				Team Prefix	String (16)	Displayed before the names of players that are part of this team
				Team Suffix	String (16)	Displayed after the names of players that are part of this team
				Friendly Flags	Byte	Bit mask. 0x01: Allow friendly fire, 0x02: can see invisible players on same team
				Name Tag Visibility	String Enum (32)	always, hideForOtherTeams, hideForOwnTeam, never
				Collision Rule	String Enum (32)	always, pushOtherTeams, pushOwnTeam, never
				Color Formatting	Byte VarInt enum	For colors, the same Chat colors (0-15). -1 indicates RESET/no color. See below for more info.
				Team Prefix	Chat	Displayed before the names of players that are part of this team
				Team Suffix	Chat	Displayed after the names of players that are part of this team
				Entity Count	VarInt	Number of elements in the following array
				Entities	Array of String (40)	Identifiers for the entities in this team. For players, this is their username; for other entities, it is their UUID.
			1: remove team	no fields	no fields
			2: update team info	Team Display Name	String (32) Chat
				Team Prefix	String (16)	Displayed before the names of entities that are part of this team
				Team Suffix	String (16)	Displayed after the names of entities that are part of this team
				Friendly Flags	Byte	Bit mask. 0x01: Allow friendly fire, 0x02: can see invisible entities on same team
				Name Tag Visibility	String Enum (32)	always, hideForOtherTeams, hideForOwnTeam, never
				Collision Rule	String Enum (32)	always, pushOtherTeams, pushOwnTeam, never
				Color Formatting	Byte VarInt enum	For colors, the same Chat colors (0-15). -1 indicates RESET/no color. See below for more info.
				Team Prefix	Chat	Displayed before the names of players that are part of this team
				Team Suffix	Chat	Displayed after the names of players that are part of this team
			3: add players to team	Entity Count	VarInt	Number of elements in the following array
				Entities	Array of String (40)	Identifiers for the entities added. For players, this is their username; for other entities, it is their UUID.
			4: remove players from team	Entity Count	VarInt	Number of elements in the following array
				Entities	Array of String (40)	Identifiers for the entities removed. For players, this is their username; for other entities, it is their UUID.

Formatting: The formatting of a team defines how the names of the team members are visualized. The following table lists all the possible formattings.

ID	Formatting
0-15	Color formatting, same values as Chat colors.
16	Obfuscated
17	Bold
18	Strikethrough
19	Underlined
20	Italic
21	Reset

Serverbound

Query Block NBT

Used when Shift+F3+I is pressed while looking at a block.

Packet ID	State	Bound To	Field Name	Field Type	Notes
0x01	Play	Server	Transaction ID	VarInt	An incremental ID so that the client can verify that the response matches.
			Location	Position	The location of the block to check.

Tab-Complete (serverbound)

Sent when the client needs to tab-complete a minecraft:ask_server suggestion type.

Packet ID	State	Bound To	Field Name	Field Type	Notes
0x01 0x05	Play	Server	Transaction Id	VarInt	The id received in the tab completion request packet, must match or the client will ignore this packet. Client generates this and increments it each time it sends another tab completion that doesn't get a response.
			Text	String (32767 32500)	All text behind the cursor without the / (e.g. to the left of the cursor in left-to-right languages like English)
			Assume Command	Boolean	If true, the server will parse Text as a command even if it doesn't start with a /. Used in the command block GUI.
			Has Position	Boolean
			Looked At Block	Optional Position	The position of the block being looked at. Only sent if Has Position is true.

Plugin Message (serverbound)

Main article: Plugin channels

Mods and plugins can use this to send their data. Minecraft itself uses a number of plugin channels. These internal channels are prefixed with MC|.

More documentation on this: http://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/

Note that the length of Data is known only from the packet length, since the packet has no length field of any kind.

Packet ID	State	Bound To	Field Name	Field Type	Notes
0x0A	Play	Server	Channel	String (20) Identifier	Name of the plugin channel used to send the data
			Data	Byte Array	Any data, depending on the channel. MC| channels are documented here. The length of this array must be inferred from the packet length.

Edit Book

Packet ID	State	Bound To	Field Name	Field Type	Notes
0x0B	Play	Server	New book	Slot
			Is signing	Boolean	True if the player is signing the book; false if the player is saving a draft.
			Hand	VarInt enum	0: Main hand, 1: Off hand

When editing a draft, the NBT section of the Slot contains this:

TAG_Compound(''): 1 entry
{
  TAG_List('pages'): 2 entries
  {
    TAG_String(0): 'Something on Page 1'
    TAG_String(1): 'Something on Page 2'
  }
}

When signing the book, it instead looks like this:

TAG_Compound(''): 3 entires
{
  TAG_String('author'): 'Steve'
  TAG_String('title'): 'A Wonderful Book'
  TAG_List('pages'): 2 entries
  {
    TAG_String(0): 'Something on Page 1'
    TAG_String(1): 'Something on Page 2'
  }
}

Query Entity NBT

Used when Shift+F3+I is pressed while looking at an entity.

Packet ID	State	Bound To	Field Name	Field Type	Notes
0x0C	Play	Server	Transaction ID	VarInt	An incremental ID so that the client can verify that the response matches.
			Entity ID	VarInt	The ID of the entity to query.

Pick Item

Used to swap out an empty space on the hotbar with the item in the given inventory slot. The Notchain client uses this for pick block functionality (middle click) to retrieve items from the inventory.

Packet ID	State	Bound To	Field Name	Field Type	Notes
0x15	Play	Server	Slot to use	VarInt	See Inventory

The server will first search the player's hotbar for an empty slot, starting from the current slot and looping around to the slot before it. If there are no empty slots, it will start a second search from the current slot and find the first slot that does not contain an enchanted item. If there still are no slots that meet that criteria, then the server will use the currently selected slot.

After finding the appropriate slot, the server swaps the items and then send 3 packets:

• Set Slot, with window ID set to -2 and slot set to the newly chosen slot and the item set to the item that is now in that slot (which was previously at the slot the client requested)
• Set Slot, with window ID set to -2 and slot set to the slot the player requested, with the item that is now in that slot and was previously on the hotbar slot
• Held Item Change, with the slot set to the newly chosen slot.

Craft Recipe Request

A replacement for Prepare Crafting Grid. It appears to behave more or less the same, but the client does not specify where to move the items.

This packet is sent when a player clicks a recipe in the crafting book that is craftable (white border).

Packet ID	State	Bound To	Field Name	Field Type	Notes
0x12 0x16	Play	Server	Window ID	Byte
			Recipe	VarInt Identifier	A recipe ID
			Make all	Boolean	Affects the amount of items processed; true if shift is down when clicked

Recipe Book Data

(previously known as Crafting Book Data)

Packet ID	State	Bound To	Field Name		Field Type	Notes
0x17 0x1B	Play	Server	Type		VarInt	Determines the format of the rest of the packet
			Type	Field Name
			0: Displayed Recipe	Recipe ID	Int Identifer	A recipe ID
			1: Recipe Book States	Crafting Recipe Book Open	Boolean	Whether the player has the crafting recipe book currently opened/active.
				Crafting Recipe Filter Active	Boolean	Whether the player has the crafting recipe book filter option currently active.
				Smelting Recipe Book Open	Boolean	Whether the player has the smelting recipe book currently opened/active.
				Smelting Recipe Filter Active	Boolean	Whether the player has the smelting recipe book filter option currently active.

The Recipe Book Status type is sent when one of the states changes.

Name Item

Sent as a player is renaming an item in an anvil (each keypress in the anvil UI sends a new MC|ItemName Name Item packet). If the new name is empty, then the item loses its custom name (this is different from setting the custom name to the normal name of the item). The item name may be no longer than 35 characters long, and if it is longer than that, then the rename is silently ignored.

Packet ID	State	Bound To	Field Name	Field Type	Notes
0x1C	Play	Server	Item name	String (32767)	The new name of the item

Select Trade

When a player selects a specific trade offered by a villager NPC.

Packet ID	State	Bound To	Field Name	Field Type	Notes
0x1E	Play	Server	Selected slot	Integer VarInt	The selected slot int the players current (trading) inventory. (Was a full Integer for the plugin message)

Set Beacon Effect

Changes the effect of the current beacon.

Packet ID	State	Bound To	Field Name	Field Type	Notes
0x20	Play	Server	Primary Effect	Integer VarInt	A Potion ID. (Was a full Integer for the plugin message)
			Secondary Effect	Integer VarInt	A Potion ID. (Was a full Integer for the plugin message)

Update Command Block

Packet ID	State	Bound To	Field Name	Field Type	Notes
0x22	Play	Server
			X	Int
			Y	Int
			Z	Int
			Location	Position
			Command	String (32767)
			Track output	Boolean	If false, the output of the previous command will not be stored within the command block.
			Mode	String VarInt enum	One of "SEQUENCE" (0), "AUTO" (1), and "REDSTONE" (2)
			Is conditional	Boolean
			Automatic	Boolean
			Flags	Byte	0x01: Track Output (if false, the output of the previous command will not be stored within the command block); 0x02: Is conditional; 0x04: Automatic

Update Command Block Minecart

Packet ID	State	Bound To	Field Name	Field Type	Notes
0x23	Play	Server	Entity ID	Int VarInt
			Command	String
			Track Output	Boolean	If false, the output of the previous command will not be stored within the command block.

Update Structure Block

Packet ID	State	Bound To	Field Name	Field Type	Notes
0x25	Play	Server	X	Int	Tile entity location
			Y	Int	Tile entity location
			Z	Int	Tile entity location
			Location	Position	Block entity location
			Action	Byte VarInt enum	An additional action to perform beyond simply saving the given data; see below
			Mode	String VarInt enum	One of "SAVE" (0), "LOAD" (1), "CORNER" (2), "DATA" (3).
			Name	String
			Offset X	Int Byte	Between -32 and 32
			Offset Y	Int Byte	Between -32 and 32
			Offset Z	Int Byte	Between -32 and 32
			Size X	Int Byte	Between 0 and 32
			Size Y	Int Byte	Between 0 and 32
			Size Z	Int Byte	Between 0 and 32
			Mirror	String VarInt enum	One of "NONE" (0), "LEFT_RIGHT" (1), "FRONT_BACK" (2).
			Rotation	String VarInt enum	One of "NONE" (0), "CLOCKWISE_90" (1), "CLOCKWISE_180" (2), "COUNTERCLOCKWISE_90" (3).
			Metadata	String
			Ignore entities	Boolean
			Show air	Boolean
			Show bounding box	Boolean
			Integrity	Float	Between 0 and 1
			Seed	VarLong
			Flags	Byte	0x01: Ignore entities; 0x02: Show air; 0x04: Show bounding box

Possible actions:

• 1 0 - Update data
• 2 1 - Save the structure
• 3 2 - Load the structure
• 4 3 - Detect size

All other values are ignored. The Notchian client uses 1 update data to indicate no special action should be taken (i.e. the done button).

Handshaking

Clientbound

There are no clientbound packets in the Handshaking state, since the protocol immediately switches to a different state after the client sends the first packet.

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 340 401)
			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

Status

Clientbound

No changes so far.

Serverbound

No changes so far.

Login

Clientbound

Login Plugin Request

Used to implement a custom handshaking flow together with Login Plugin Response.

Unlike plugin messages in "play" mode, these messages follow a lock-step request/response scheme, where the client is expected to respond to a request indicating whether it understood. The vanilla client always responds that it hasn't understood, and sends an empty payload.

Packet ID	State	Bound To	Field Name	Field Type	Notes
0x04	Play	Client	Message ID	VarInt	Generated by the server - should be unique to the connection.
			Channel	Identifier	Name of the plugin channel used to send the data
			Data	Byte Array	Any data, depending on the channel. MC| channels are documented here. The length of this array must be inferred from the packet length.

Serverbound

Login Plugin Response

Packet ID	State	Bound To	Field Name	Field Type	Notes
0x02	Play	Client	Message ID	VarInt	Should match ID from server.
			Successful	Boolean	true if the client understands the request, false otherwise. When false, no payload follows.
			Data	Optional Byte Array	Any data, depending on the channel. MC| channels are documented here. The length of this array must be inferred from the packet length.