Difference between revisions of "Pre-release protocol"

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(Fix: clientbound packets are listed under "serverbound" in packet table)
 
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This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently [[Protocol version numbers|1.15.2, protocol 578]]) to the current pre-release (currently [[Protocol version numbers|20w27a, protocol 738]]). Note that this page contains bleeding-edge information that may not be completely or correctly documented.
+
This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently [[Protocol version numbers|1.16.4, protocol 754]]) to the current pre-release (currently [[Protocol version numbers|20w48a, protocol 1073741831]]). 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.
 
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.
Line 9: Line 9:
 
=== Data types ===
 
=== Data types ===
  
The UUID type is now also sometimes encoded by the Notchian server as an array of four 32-bit integers, from most significant to least significant (matching the new format used on entity NBT).  This representation is identical to using 16 bytes, two 64-bit integers, or one 128-bit integers.
+
No changes so far.
  
 
=== Packets ===
 
=== Packets ===
Line 17: Line 17:
 
  ! Packet name
 
  ! Packet name
 
  !colspan="2"| Documentation
 
  !colspan="2"| Documentation
 +
|-
 +
!colspan="4"| Play clientbound
 +
{{PacketList|0x20|Chunk Data}}
 +
{{PacketList|0x23|Update Light}}
 +
{{PacketList|0x25|Map Data}}
 +
{{PacketList|0x38|Resource Pack Send}}
 
  |-
 
  |-
 
!colspan="4"| Handshaking serverbound
 
!colspan="4"| Handshaking serverbound
 
{{PacketList|0x00|Handshake}}
 
{{PacketList|0x00|Handshake}}
|-
 
!colspan="4"| Play clientbound
 
{{PacketList|0x02|Spawn Weather Entity|pre=removed}}
 
{{PacketList|{{change|0x03|0x02}}|Spawn Living Entity|pre=unchanged}}
 
{{PacketList|{{change|0x04|0x03}}|Spawn Painting|pre=unchanged}}
 
{{PacketList|{{change|0x05|0x04}}|Spawn Player|pre=unchanged}}
 
{{PacketList|{{change|0x06|0x05}}|Entity Animation (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x07|0x06}}|Statistics|pre=unchanged}}
 
{{PacketList|{{change|0x08|0x07}}|Acknowledge Player Digging|pre=unchanged}}
 
{{PacketList|{{change|0x09|0x08}}|Block Break Animation|pre=unchanged}}
 
{{PacketList|{{change|0x0A|0x09}}|Block Entity Data|pre=unchanged}}
 
{{PacketList|{{change|0x0B|0x0A}}|Block Action|pre=unchanged}}
 
{{PacketList|{{change|0x0C|0x0B}}|Block Change|pre=unchanged}}
 
{{PacketList|{{change|0x0D|0x0C}}|Boss Bar|pre=unchanged}}
 
{{PacketList|{{change|0x0E|0x0D}}|Server Difficulty|pre=unchanged}}
 
{{PacketList|{{change|0x0F|0x0E}}|Chat Message (clientbound)}}
 
{{PacketList|{{change|0x11|0x09}}|Tab-Complete (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x12|0x10}}|Declare Commands|pre=unchanged}}
 
{{PacketList|{{change|0x13|0x11}}|Window Confirmation (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x14|0x12}}|Close Window (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x15|0x13}}|Window Items|pre=unchanged}}
 
{{PacketList|{{change|0x16|0x14}}|Window Property|pre=unchanged}}
 
{{PacketList|{{change|0x17|0x15}}|Set Slot|pre=unchanged}}
 
{{PacketList|{{change|0x18|0x16}}|Set Cooldown|pre=unchanged}}
 
{{PacketList|{{change|0x19|0x17}}|Plugin Message (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x1A|0x18}}|Named Sound Effect|pre=unchanged}}
 
{{PacketList|{{change|0x1B|0x19}}|Disconnect (play)|pre=unchanged}}
 
{{PacketList|{{change|0x1C|0x1A}}|Entity Status|pre=unchanged}}
 
{{PacketList|{{change|0x1D|0x1B}}|Explosion|pre=unchanged}}
 
{{PacketList|{{change|0x1E|0x1C}}|Unload Chunk|pre=unchanged}}
 
{{PacketList|{{change|0x1F|0x1D}}|Change Game State|pre=unchanged}}
 
{{PacketList|{{change|0x20|0x1E}}|Open Horse Window|pre=unchanged}}
 
{{PacketList|{{change|0x21|0x1F}}|Keep Alive (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x22|0x20}}|Chunk Data}}
 
{{PacketList|{{change|0x23|0x21}}|Effect|pre=unchanged}}
 
{{PacketList|{{change|0x24|0x22}}|Particle|pre=unchanged}}
 
{{PacketList|{{change|0x25|0x23}}|Update Light}}
 
{{PacketList|{{change|0x26|0x24}}|Join Game}}
 
{{PacketList|{{change|0x27|0x25}}|Map Data|pre=unchanged}}
 
{{PacketList|{{change|0x28|0x26}}|Trade List|pre=unchanged}}
 
{{PacketList|{{change|0x29|0x27}}|Entity Position|pre=unchanged}}
 
{{PacketList|{{change|0x2A|0x28}}|Entity Position and Rotation|pre=unchanged}}
 
{{PacketList|{{change|0x2B|0x29}}|Entity Rotation|pre=unchanged}}
 
{{PacketList|{{change|0x2C|0x2A}}|Entity Movement|pre=unchanged}}
 
{{PacketList|{{change|0x2D|0x2B}}|Vehicle Move (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x2E|0x2C}}|Open Book|pre=unchanged}}
 
{{PacketList|{{change|0x2F|0x2D}}|Open Window|pre=unchanged}}
 
{{PacketList|{{change|0x30|0x2E}}|Open Sign Editor|pre=unchanged}}
 
{{PacketList|{{change|0x31|0x2F}}|Craft Recipe Response|pre=unchanged}}
 
{{PacketList|{{change|0x32|0x30}}|Player Abilities (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x33|0x31}}|Combat Event|pre=unchanged}}
 
{{PacketList|{{change|0x34|0x32}}|Player Info|pre=unchanged}}
 
{{PacketList|{{change|0x35|0x33}}|Face Player|pre=unchanged}}
 
{{PacketList|{{change|0x36|0x34}}|Player Position And Look (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x37|0x35}}|Unlock Recipes}}
 
{{PacketList|{{change|0x38|0x36}}|Destroy Entities|pre=unchanged}}
 
{{PacketList|{{change|0x39|0x37}}|Remove Entity Effect|pre=unchanged}}
 
{{PacketList|{{change|0x3A|0x38}}|Resource Pack Send|pre=unchanged}}
 
{{PacketList|{{change|0x3B|0x39}}|Respawn}}
 
{{PacketList|{{change|0x3C|0x3A}}|Entity Head Look|pre=unchanged}}
 
{{PacketList|{{change|0x10|0x3B}}|Multi Block Change}}
 
{{PacketList|{{change|0x3D|0x3C}}|Select Advancement Tab|pre=unchanged}}
 
{{PacketList|{{change|0x3E|0x3D}}|World Border|pre=unchanged}}
 
{{PacketList|{{change|0x3F|0x3E}}|Camera|pre=unchanged}}
 
{{PacketList|{{change|0x40|0x3F}}|Held Item Change (clientbound)|pre=unchanged}}
 
{{PacketList|{{change|0x41|0x40}}|Update View Position|pre=unchanged}}
 
{{PacketList|{{change|0x42|0x41}}|Update View Distance|pre=unchanged}}
 
{{PacketList|0x47|Entity Equipment}}
 
{{PacketList|{{change|0x4E|0x42}}|Spawn Position|pre=unchanged}}
 
{{PacketList|{{change|0x4F|0x4E}}|Time Update|pre=unchanged}}
 
{{PacketList|{{change|0x50|0x4F}}|Title|pre=unchanged}}
 
{{PacketList|{{change|0x51|0x50}}|Entity Sound Effect|pre=unchanged}}
 
{{PacketList|{{change|0x52|0x51}}|Sound Effect|pre=unchanged}}
 
{{PacketList|{{change|0x53|0x52}}|Stop Sound|pre=unchanged}}
 
{{PacketList|{{change|0x54|0x53}}|Player List Header And Footer|pre=unchanged}}
 
{{PacketList|{{change|0x55|0x54}}|NBT Query Response|pre=unchanged}}
 
{{PacketList|{{change|0x56|0x55}}|Collect Item|pre=unchanged}}
 
{{PacketList|{{change|0x57|0x56}}|Entity Teleport|pre=unchanged}}
 
{{PacketList|{{change|0x58|0x57}}|Advancements|pre=unchanged}}
 
{{PacketList|{{change|0x59|0x58}}|Entity Properties}}
 
{{PacketList|{{change|0x5A|0x59}}|Entity Effect|pre=unchanged}}
 
{{PacketList|{{change|0x5B|0x5A}}|Declare Recipes}}
 
{{PacketList|{{change|0x5C|0x5B}}|Tags|pre=unchanged}}
 
|-
 
!colspan="4"| Play serverbound
 
{{PacketList|0x0E|Interact Entity}}
 
{{PacketList|0x0F|Generate Structure|rel=added}}
 
{{PacketList|{{change|0x0F|0x10}}|Keep Alive (serverbound)|pre=unchanged}}
 
{{PacketList|{{change|0x10|0x11}}|Lock Difficulty|pre=unchanged}}
 
{{PacketList|{{change|0x11|0x12}}|Player Position|pre=unchanged}}
 
{{PacketList|{{change|0x12|0x13}}|Player Position And Rotation (serverbound)|pre=unchanged}}
 
{{PacketList|{{change|0x13|0x14}}|Player Rotation|pre=unchanged}}
 
{{PacketList|{{change|0x14|0x15}}|Player Movement|pre=unchanged}}
 
{{PacketList|{{change|0x15|0x16}}|Vehicle Move (serverbound)|pre=unchanged}}
 
{{PacketList|{{change|0x16|0x17}}|Steer Boat|pre=unchanged}}
 
{{PacketList|{{change|0x17|0x18}}|Pick Item|pre=unchanged}}
 
{{PacketList|{{change|0x18|0x19}}|Craft Recipe Request|pre=unchanged}}
 
{{PacketList|{{change|0x19|0x1A}}|Player Abilities (serverbound)}}
 
{{PacketList|{{change|0x1A|0x1B}}|Player Digging|pre=unchanged}}
 
{{PacketList|{{change|0x1B|0x1C}}|Entity Action|pre=unchanged}}
 
{{PacketList|{{change|0x1C|0x1D}}|Steer Vehicle|pre=unchanged}}
 
{{PacketList|0x1D|Recipe Book Data|pre=removed}}
 
{{PacketList|0x1E|Set Displayed Recipe|rel=added}}
 
{{PacketList|0x1F|Set Recipe Book State|rel=added}}
 
{{PacketList|{{change|0x1E|0x20}}|Name Item|pre=unchanged}}
 
{{PacketList|{{change|0x1F|0x21}}|Resource Pack Status|pre=unchanged}}
 
{{PacketList|{{change|0x20|0x22}}|Advancement Tab|pre=unchanged}}
 
{{PacketList|{{change|0x21|0x23}}|Select Trade|pre=unchanged}}
 
{{PacketList|{{change|0x22|0x24}}|Set Beacon Effect|pre=unchanged}}
 
{{PacketList|{{change|0x23|0x25}}|Held Item Change (serverbound)|pre=unchanged}}
 
{{PacketList|{{change|0x24|0x26}}|Update Command Block|pre=unchanged}}
 
{{PacketList|{{change|0x25|0x27}}|Update Command Block Minecart|pre=unchanged}}
 
{{PacketList|{{change|0x26|0x28}}|Creative Inventory Action|pre=unchanged}}
 
{{PacketList|{{change|0x27|0x29}}|Update Jigsaw Block}}
 
{{PacketList|{{change|0x28|0x2A}}|Update Structure Block|pre=unchanged}}
 
{{PacketList|{{change|0x29|0x2B}}|Update Sign|pre=unchanged}}
 
{{PacketList|{{change|0x2A|0x2C}}|Animation (serverbound)|pre=unchanged}}
 
{{PacketList|{{change|0x2B|0x2D}}|Spectate|pre=unchanged}}
 
{{PacketList|{{change|0x2C|0x2E}}|Player Block Placement|pre=unchanged}}
 
{{PacketList|{{change|0x2D|0x2F}}|Use Item|pre=unchanged}}
 
|-
 
!colspan="4"| Login clientbound
 
{{PacketList|0x02|Login Success}}
 
 
  |}
 
  |}
  
Line 153: Line 36:
 
{{#vardefine:meta_prerelease|1}}
 
{{#vardefine:meta_prerelease|1}}
  
=== FishingHook ===
+
{{Warning2|Note that other entities have had metadata shifts due to these changes, not shown here.}}
  
{{Metadata inherit|FishingHook|inherits=Entity|start_at=7}}
+
=== Entity ===
  
{| class="wikitable"
+
{{metadata inherit|Entity}}
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
|-
 
| {{Metadata id|}}
 
| VarInt
 
|colspan="2"| Hooked entity id + 1, or 0 if there is no hooked entity
 
| 0
 
|- {{Added}}
 
| {{Metadata id|added}}
 
| Boolean
 
|colspan="2"| Is catchable
 
| False
 
|}
 
 
 
=== Abstract Arrow ===
 
 
 
{{Metadata inherit|Abstract Arrow|inherits=Entity|start_at=7}}
 
 
 
Abstract base class for [[#Tipped Arrow|Tipped Arrow]] (which is used for regular arrows as well as tipped ones) and [[#Spectral Arrow|Spectral Arrow]].
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 186: Line 48:
 
  ! Default
 
  ! Default
 
  |-
 
  |-
  | rowspan="3" | {{Metadata id|}}
+
  |rowspan="9"| {{Metadata id|}}
  | rowspan="3" | Byte
+
  |rowspan="9"| Byte
 
  ! Bit mask
 
  ! Bit mask
 
  ! Meaning
 
  ! Meaning
  | rowspan="3" | 0
+
  |rowspan="9"| 0
 
  |-
 
  |-
 
  | 0x01
 
  | 0x01
  | Is critical
+
  | Is on fire
 
  |-
 
  |-
 
  | 0x02
 
  | 0x02
  | Is noclip (used by loyalty tridents when returning)
+
  | Is crouching
|- {{removed}}
 
| {{Metadata id|removed}}
 
| OptUUID
 
|colspan="2"| Unused
 
| Empty
 
 
  |-
 
  |-
  | {{Metadata id|}}
+
  | 0x04
| Byte
+
  | Unused (previously riding)
|colspan="2"| Peircing level
 
| 0
 
|}
 
 
 
=== Tipped Arrow ===
 
 
 
{{Metadata inherit|Tipped Arrow|inherits=Abstract Arrow}}
 
 
 
Used for both tipped and regular arrows.  If not tipped, then color is set to -1 and no tipped arrow particles are used.
 
 
 
{| class="wikitable"
 
! Index
 
! Type
 
  !style="width: 250px;" colspan="2"| Meaning
 
! Default
 
 
  |-
 
  |-
  | {{Metadata id|}}
+
  | 0x08
| VarInt
+
  | Is sprinting
|colspan="2"| Color (-1 for no particles)
 
  | -1
 
|}
 
 
 
=== Spectral Arrow ===
 
 
 
{{Metadata inherit|Spectral Arrow|inherits=Abstract Arrow}}
 
 
 
No additional metadata.
 
 
 
=== Trident ===
 
 
 
{{Metadata inherit|Trident|inherits=Abstract Arrow}}
 
 
 
{| class="wikitable"
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
 
  |-
 
  |-
  | {{Metadata id|}}
+
  | 0x10
| VarInt
+
  | Is swimming
|colspan="2"| Loyalty level (enchantment)
 
  | 0
 
 
  |-
 
  |-
  | {{Metadata id|}}
+
  | 0x20
| Boolean
+
  | Is invisible
|colspan="2"| Has enchantment glint
 
| False
 
|}
 
 
 
=== Strider ===
 
 
 
{{Metadata inherit|Strider|inherits=Animal|start_at=16}}
 
 
 
{| class="wikitable" {{added}}
 
! Index
 
  ! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
 
  |-
 
  |-
  | {{Metadata id|}}
+
  | 0x40
| VarInt
+
  | has glowing effect
|colspan="2"| Total time to "boost" with warped fungus on a stick for
 
  | 0
 
 
  |-
 
  |-
  | {{Metadata id|}}
+
  | 0x80
| Boolean
+
  | Is flying with an {{Minecraft Wiki|elytra}}
  |colspan="2"| Is shaking (true unless riding a vehicle or on or in a block tagged with strider_warm_blocks (default: lava))
 
| false
 
 
  |-
 
  |-
 
  | {{Metadata id|}}
 
  | {{Metadata id|}}
  | Boolean
+
  | VarInt
  |colspan="2"| Has saddle
+
  |colspan="2"| Air ticks
  | false
+
  | 300
|}
 
 
 
=== Hoglin ===
 
 
 
{{Metadata inherit|Hoglin|inherits=Animal|start_at=16}}
 
 
 
{| class="wikitable" {{added}}
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
 
  |-
 
  |-
 
  | {{Metadata id|}}
 
  | {{Metadata id|}}
  | Boolean
+
  | OptChat
  |colspan="2"| Is immune to zombification
+
  |colspan="2"| Custom name
  | false
+
  | empty
|}
 
 
 
=== Zoglin ===
 
 
 
{{Metadata inherit|Hoglin|inherits=Monster|start_at=15}}
 
 
 
{| class="wikitable" {{added}}
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
 
  |-
 
  |-
 
  | {{Metadata id|}}
 
  | {{Metadata id|}}
 
  | Boolean
 
  | Boolean
  |colspan="2"| Is baby
+
  |colspan="2"| Is custom name visible
 
  | false
 
  | false
|}
 
 
=== Base Piglin ===
 
 
{{Metadata inherit|Base Piglin|inherits=Monster|start_at=15}}
 
 
{| class="wikitable" {{added}}
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
 
  |-
 
  |-
 
  | {{Metadata id|}}
 
  | {{Metadata id|}}
 
  | Boolean
 
  | Boolean
  |colspan="2"| Is immune to zombification
+
  |colspan="2"| Is silent
 
  | false
 
  | false
|}
 
 
=== Piglin ===
 
 
{{Metadata inherit|Piglin|inherits=Base Piglin}}
 
 
{| class="wikitable" {{added}}
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
 
  |-
 
  |-
 
  | {{Metadata id|}}
 
  | {{Metadata id|}}
 
  | Boolean
 
  | Boolean
  |colspan="2"| Is baby
+
  |colspan="2"| Has no gravity
| false
 
|-
 
| {{Metadata id|}}
 
| Boolean
 
|colspan="2"| Is charging crossbow
 
| false
 
|-
 
| {{Metadata id|}}
 
| Boolean
 
|colspan="2"| Is dancing
 
| false
 
|}
 
 
 
=== Piglin Brute ===
 
 
 
{{Metadata inherit|Piglin Brute|inherits=Base Piglin}}
 
 
 
No additional metadata.
 
 
 
=== Wolf ===
 
 
 
{{Metadata inherit|Wolf|inherits=TameableAnimal|start_at=18}}
 
 
 
{| class="wikitable"
 
! Index
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Default
 
|-
 
| {{Metadata id|}}
 
| Boolean
 
|colspan="2"| Is begging
 
 
  | false
 
  | false
 
  |-
 
  |-
 
  | {{Metadata id|}}
 
  | {{Metadata id|}}
 +
| Pose
 +
|colspan="2"| Pose
 +
| STANDING
 +
|- {{added}}
 +
| {{Metadata id|added}}
 
  | VarInt
 
  | VarInt
  |colspan="2"| Collar color (values are those {{Minecraft Wiki|Data_values#Dyes|used with dyes}})
+
  |colspan="2"| Ticks frozen in powdered snow
| 14 (Red)
 
|- {{Added}}
 
| {{Metadata id|}}
 
| VarInt
 
|colspan="2"| Anger time
 
 
  | 0
 
  | 0
 
  |}
 
  |}
 
=== {{Change|Zombie Pigman|Zombified Piglin}} ===
 
 
{{Metadata inherit|{{Change|Zombie Pigman|Zombified Piglin}}|inherits=Zombie|start_at=18}}
 
 
No additional metadata.
 
  
 
== Block Actions ==
 
== Block Actions ==
Line 407: Line 129:
  
 
=== Clientbound ===
 
=== Clientbound ===
 
==== Chat Message (clientbound) ====
 
 
Identifying the difference between Chat/System Message is important as it helps respect the user's chat visibility options.  See [[Chat#Processing chat|processing chat]] for more info about these positions.
 
 
{{warning2|Game info accepts json formatting but does not display it, although the deprecated §-based formatting works.  This is not an issue when using the [[#Title|Title]] packet, so prefer that packet for displaying information in that slot.  See [https://bugs.mojang.com/browse/MC-119145 MC-119145] for more information.}}
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="3"| {{change|0x0F|0x0E}}
 
|rowspan="3"| Play
 
|rowspan="3"| Client
 
| JSON Data
 
| [[Chat]]
 
| Limited to 32767 bytes
 
|-
 
| Position
 
| Byte
 
| 0: chat (chat box), 1: system message (chat box), 2: game info (above hotbar).
 
|- {{added}}
 
| Sender
 
| UUID
 
| Used by the Notchian client for the disableChat launch option. Setting both longs to 0 will always display the message regardless of the setting.
 
|}
 
  
 
==== Chunk Data ====
 
==== Chunk Data ====
Line 444: Line 136:
 
{{Need Info|How do biomes work now?  The biome change happened at the same time as the seed change, but it's not clear how/if biomes could be computed given that it's not the actual seed...  ([https://www.reddit.com/r/Mojira/comments/e5at6i/a_discussion_for_the_changes_to_how_biomes_are/ /r/mojira discussion] which notes that it seems to be some kind of interpolation, and 3D biomes are only used in the nether)}}
 
{{Need Info|How do biomes work now?  The biome change happened at the same time as the seed change, but it's not clear how/if biomes could be computed given that it's not the actual seed...  ([https://www.reddit.com/r/Mojira/comments/e5at6i/a_discussion_for_the_changes_to_how_biomes_are/ /r/mojira discussion] which notes that it seems to be some kind of interpolation, and 3D biomes are only used in the nether)}}
  
The server only sends skylight information for chunk pillars in the {{Minecraft Wiki|Overworld}}, it's up to the client to know in which dimenison the player is currently located. You can also infer this information from the primary bitmask and the amount of uncompressed bytes sent.  This packet also sends all block entities in the chunk (though sending them is not required; it is still legal to send them with [[#Update Block Entity|Update Block Entity]] later).
+
The server only sends skylight information for chunk pillars in the {{Minecraft Wiki|Overworld}}, it's up to the client to know in which dimension the player is currently located. You can also infer this information from the primary bitmask and the amount of uncompressed bytes sent.  This packet also sends all block entities in the chunk (though sending them is not required; it is still legal to send them with [[#Update Block Entity|Update Block Entity]] later).
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 454: Line 146:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="12"| {{change|0x22|0x20}}
+
  |rowspan="11"| 0x20
  |rowspan="12"| Play
+
  |rowspan="11"| Play
  |rowspan="12"| Client
+
  |rowspan="11"| Client
 
  | Chunk X
 
  | Chunk X
 
  | Int
 
  | Int
Line 464: Line 156:
 
  | Int
 
  | Int
 
  | Chunk coordinate (block coordinate divided by 16, rounded down)
 
  | Chunk coordinate (block coordinate divided by 16, rounded down)
  |-
+
  |- {{removed}}
 
  | Full chunk
 
  | Full chunk
 
  | Boolean
 
  | Boolean
 
  | See [[Chunk Format#Full chunk|Chunk Format]]
 
  | See [[Chunk Format#Full chunk|Chunk Format]]
|- {{Added}}
 
| Ignore old data
 
| Boolean
 
| If false, the client will recalculate lighting based on the old/new chunk data
 
 
  |-
 
  |-
 
  | Primary Bit Mask
 
  | Primary Bit Mask
Line 480: Line 168:
 
  | [[NBT]]
 
  | [[NBT]]
 
  | Compound containing one long array named <code>MOTION_BLOCKING</code>, which is a heightmap for the highest solid block at each position in the chunk (as a compacted long array with 256 entries at 9 bits per entry totaling 36 longs). The Notchian server also adds a <code>WORLD_SURFACE</code> long array, the purpose of which is unknown, but it's not required for the chunk to be accepted.
 
  | Compound containing one long array named <code>MOTION_BLOCKING</code>, which is a heightmap for the highest solid block at each position in the chunk (as a compacted long array with 256 entries at 9 bits per entry totaling 36 longs). The Notchian server also adds a <code>WORLD_SURFACE</code> long array, the purpose of which is unknown, but it's not required for the chunk to be accepted.
  |- {{Added}}
+
  |-  
 
  | Biomes length
 
  | Biomes length
 
  | Optional VarInt
 
  | Optional VarInt
Line 486: Line 174:
 
  |-
 
  |-
 
  | Biomes
 
  | Biomes
  | Optional array of {{change|Integer|VarInt}}
+
  | Optional array of VarInt
  | {{change|1024 biome IDs, ordered by x then z then y, in 4&times;4&times;4 blocks.|Possibly something else.}} Not present if full chunk is false.
+
  | <s>1024 biome IDs, ordered by x then z then y, in 4&times;4&times;4 blocks.</s>Possibly something else.  Not present if full chunk is false.
 
  |-  
 
  |-  
 
  | Size
 
  | Size
Line 508: Line 196:
 
Note that the Notchian client requires an [[#Update View Position|Update View Position]] packet when it crosses a chunk border, otherwise it'll only display render distance + 2 chunks around the chunk it spawned in.
 
Note that the Notchian client requires an [[#Update View Position|Update View Position]] packet when it crosses a chunk border, otherwise it'll only display render distance + 2 chunks around the chunk it spawned in.
  
{{Change||The compacted array format has been adjusted so that individual entries no longer span across multiple longs, affecting the main data array and heightmaps.}}
+
The compacted array format has been adjusted so that individual entries no longer span across multiple longs, affecting the main data array and heightmaps.
 +
 
 +
New format, 5 bits per block, containing the following references to blocks in a palette (not shown): <span style="border: solid 2px hsl(0, 90%, 60%)">1</span><span style="border: solid 2px hsl(30, 90%, 60%)">2</span><span style="border: solid 2px hsl(60, 90%, 60%)">2</span><span style="border: solid 2px hsl(90, 90%, 60%)">3</span><span style="border: solid 2px hsl(120, 90%, 60%)">4</span><span style="border: solid 2px hsl(150, 90%, 60%)">4</span><span style="border: solid 2px hsl(180, 90%, 60%)">5</span><span style="border: solid 2px hsl(210, 90%, 60%)">6</span><span style="border: solid 2px hsl(240, 90%, 60%)">6</span><span style="border: solid 2px hsl(270, 90%, 60%)">4</span><span style="border: solid 2px hsl(300, 90%, 60%)">8</span><span style="border: solid 2px hsl(330, 90%, 60%)">0</span><span style="border: solid 2px hsl(0, 90%, 30%)">7</span><span style="border: solid 2px hsl(30, 90%, 30%)">4</span><span style="border: solid 2px hsl(60, 90%, 30%)">3</span><span style="border: solid 2px hsl(90, 90%, 30%)">13</span><span style="border: solid 2px hsl(120, 90%, 30%)">15</span><span style="border: solid 2px hsl(150, 90%, 30%)">16</span><span style="border: solid 2px hsl(180, 90%, 30%)">9</span><span style="border: solid 2px hsl(210, 90%, 30%)">14</span><span style="border: solid 2px hsl(240, 90%, 30%)">10</span><span style="border: solid 2px hsl(270, 90%, 30%)">12</span><span style="border: solid 2px hsl(300, 90%, 30%)">0</span><span style="border: solid 2px hsl(330, 90%, 30%)">2</span>
 +
 
 +
<code>0020863148418841</code> <code><span style="outline: dashed 2px black">0000</span><span style="outline: solid 2px hsl(330, 90%, 60%)">00000</span><span style="outline: solid 2px hsl(300, 90%, 60%)">01000</span><span style="outline: solid 2px hsl(270, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(240, 90%, 60%)">00110</span><span style="outline: solid 2px hsl(210, 90%, 60%)">00110</span><span style="outline: solid 2px hsl(180, 90%, 60%)">00101</span><span style="outline: solid 2px hsl(150, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(120, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(90, 90%, 60%)">00011</span><span style="outline: solid 2px hsl(60, 90%, 60%)">00010</span><span style="outline: solid 2px hsl(30, 90%, 60%)">00010</span><span style="outline: solid 2px hsl(0, 90%, 60%)">00001</span></code><br>
 +
<code>01018A7260F68C87</code> <code><span style="outline: dashed 2px black">0000</span><span style="outline: solid 2px hsl(330, 90%, 30%)">00010</span><span style="outline: solid 2px hsl(300, 90%, 30%)">00000</span><span style="outline: solid 2px hsl(270, 90%, 30%)">01100</span><span style="outline: solid 2px hsl(240, 90%, 30%)">01010</span><span style="outline: solid 2px hsl(210, 90%, 30%)">01110</span><span style="outline: solid 2px hsl(180, 90%, 30%)">01001</span><span style="outline: solid 2px hsl(150, 90%, 30%)">10000</span><span style="outline: solid 2px hsl(120, 90%, 30%)">01111</span><span style="outline: solid 2px hsl(90, 90%, 30%)">01101</span><span style="outline: solid 2px hsl(60, 90%, 30%)">00011</span><span style="outline: solid 2px hsl(30, 90%, 30%)">00100</span><span style="outline: solid 2px hsl(0, 90%, 30%)">00111</span></code>
 +
 
 +
 
  
 
==== Update Light ====
 
==== Update Light ====
Line 522: Line 217:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="11"| {{change|0x25|0x23}}
+
  |rowspan="11"| 0x23
 
  |rowspan="11"| Play
 
  |rowspan="11"| Play
 
  |rowspan="11"| Client
 
  |rowspan="11"| Client
 
  |colspan="2"| Chunk X
 
  |colspan="2"| Chunk X
 
  |colspan="2"| VarInt
 
  |colspan="2"| VarInt
  | Chunk coordinate (block coordinate divided by 16, rounded down)
+
  | Chunk coordinate (block coordinate divided by 16, rounded down)  
 
  |-
 
  |-
 
  |colspan="2"| Chunk Z
 
  |colspan="2"| Chunk Z
 
  |colspan="2"| VarInt
 
  |colspan="2"| VarInt
  | Chunk coordinate (block coordinate divided by 16, rounded down)
+
  | Chunk coordinate (block coordinate divided by 16, rounded down)  
  |- {{added}}
+
  |-
 
  |colspan="2"| Trust Edges
 
  |colspan="2"| Trust Edges
 
  |colspan="2"| Boolean
 
  |colspan="2"| Boolean
 
  | If edges should be trusted for light updates.
 
  | If edges should be trusted for light updates.
|
 
 
  |-
 
  |-
  |colspan="2"| Sky Light Mask
+
  |colspan="2"| ? (Changes unknown)
  |colspan="2"| VarInt
+
  |colspan="2"| {{change|VarInt|VarLong}}
  | Mask containing 18 bits, with the lowest bit corresponding to chunk section -1 (in the void, y=-16 to y=-1) and the highest bit for chunk section 16 (above the world, y=256 to y=271)
+
  | ? (Changes unknown)
 
  |-
 
  |-
  |colspan="2"| Block Light Mask
+
  |colspan="2"| ? (Changes unknown)
  |colspan="2"| VarInt
+
  |colspan="2"| {{change|VarInt|VarLong}}
  | Mask containing 18 bits, with the same order as sky light
+
  | ? (Changes unknown)
 
  |-
 
  |-
  |colspan="2"| Empty Sky Light Mask
+
  |colspan="2"| ? (Changes unknown)
  |colspan="2"| VarInt
+
  |colspan="2"| {{change|VarInt|VarLong}}
  | Mask containing 18 bits, which indicates sections that have 0 for all their sky light values.  If a section is set in both this mask and the main sky light mask, it is ignored for this mask and it is included in the sky light arrays (the notchian server does not create such masks).  If it is only set in this mask, it is not included in the sky light arrays.
+
  | ? (Changes unknown)
 
  |-
 
  |-
  |colspan="2"| Empty Block Light Mask
+
  |colspan="2"| ? (Changes unknown)
  |colspan="2"| VarInt
+
  |colspan="2"| {{change|VarInt|VarLong}}
  | Mask containing 18 bits, which indicates sections that have 0 for all their block light values.  If a section is set in both this mask and the main block light mask, it is ignored for this mask and it is included in the block light arrays (the notchian server does not create such masks).  If it is only set in this mask, it is not included in the block light arrays.
+
  | ? (Changes unknown)
 
  |-
 
  |-
 
  |rowspan="2"| Sky Light arrays
 
  |rowspan="2"| Sky Light arrays
Line 575: Line 269:
 
  |}
 
  |}
  
Individual block or sky light arrays are is given for each block with increasing x coordinates, within rows of increasing z coordinates, within layers of increasing y coordinates. Even-indexed items (those with an even x coordinate, starting at 0) are packed into the low bits, odd-indexed into the high bits.
 
  
==== Join Game ====
 
  
See [[Protocol Encryption]] for information on logging in.
+
 
 +
==== Map Data ====
 +
 
 +
Updates a rectangular area on a {{Minecraft Wiki|map}} item.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 585: Line 280:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
  ! Field Type
+
  !colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="16"| {{change|0x26|0x24}}
+
  |rowspan="18"| 0x25
  |rowspan="16"| Play
+
  |rowspan="18"| Play
  |rowspan="16"| Client
+
  |rowspan="18"| Client
  | Entity ID
+
  |colspan="2"| Map ID
  | Int
+
  |colspan="2"| VarInt
  | The player's Entity ID (EID)
+
  | Map ID of the map being modified
 
  |-
 
  |-
  | Is hardcore
+
  |colspan="2"| Scale
  | Boolean
+
|colspan="2"| 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)
 +
|- {{removed}}
 +
|colspan="2"| Tracking Position
 +
  |colspan="2"| Boolean
 +
  | Specifies whether player and item frame icons are shown
 
  |-
 
  |-
  | Gamemode
+
  |colspan="2"| Locked
| Unsigned Byte
+
  |colspan="2"| Boolean
| 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. {{change|Bit 3 (0x8) is the hardcore flag.}}
+
  | True if the map has been locked in a cartography table
  |- {{Added}}
+
  |-  
| Previous Gamemode
+
  |- {{added}}
| Unsigned Byte
+
  |colspan="2"| Tracking Position
| 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included. The previous gamemode. (More information needed)
+
  |colspan="2"| Boolean
|- {{Added}}
+
  | Specifies whether player and item frame icons are shown
| World Count
 
| VarInt
 
  | Size of the following array
 
  |- {{Added}}
 
| World Names
 
| Array of Identifier
 
| Identifiers for all worlds on the server
 
  |- {{Added}}
 
  | Dimension Codec
 
  | [[NBT|NBT Tag Compound]]
 
  | This CompoundTag contains a ListTag named "dimension". The ListTag should contain CompoundTags with named StringTags "key" and "element". The full extent of these is still unknown, but the tag represents a dimension registry. See below for the vanilla default.
 
 
  |-
 
  |-
  | Dimension
+
  |colspan="2"| Icon Count
  | {{change|Int Enum|Identifier}}
+
  |colspan="2"| VarInt
  | {{change|-1: The Nether, 0: The Overworld, 1: The End|Valid dimensions are defined per dimension registry sent before this}}
+
  | Number of elements in the following array. {{change||Only present if "Tracking Position" is true.}}
|- {{Added}}
 
| World Name
 
| Identifier
 
| Name of the world being spawned into
 
 
  |-
 
  |-
  | Hashed seed
+
  |rowspan="6"| Icon
  | Long
+
| Type
  | First 8 bytes of the SHA-256 hash of the world's seed.
+
|rowspan="6"| Array
 +
  | VarInt enum
 +
  | See below
 
  |-
 
  |-
  | Max Players
+
  | X
| Unsigned Byte
 
| Was once used by the client to draw the player list, but now is ignored
 
|- {{Removed}}
 
| Level Type
 
| String Enum (16)
 
| default, flat, largeBiomes, amplified, customized, buffet, default_1_1
 
|-
 
| View Distance
 
| VarInt
 
| Render distance (2-32)
 
|-
 
| Reduced Debug Info
 
| Boolean
 
| If true, a Notchian client shows reduced information on the {{Minecraft Wiki|debug screen}}.  For servers in development, this should almost always be false.
 
|-
 
| Enable respawn screen
 
| Boolean
 
| Set to false when the doImmediateRespawn gamerule is true
 
|- {{Added}}
 
| Is Debug
 
| Boolean
 
| True if the world is a {{Minecraft Wiki|debug mode}} world; debug mode worlds cannot be modified and have predefined blocks
 
|- {{Added}}
 
| Is Flat
 
| Boolean
 
| True if the world is a {{Minecraft Wiki|superflat}} world; flat worlds have different void fog and a horizon at y=0 instead of y=63
 
|}
 
Example of Dimension codec CompoundTag sent by the server:
 
    ListTag (Type: CompoundTag) "dimension":
 
        CompoundTag:
 
            StringTag "name" value: 'minecraft:overworld'
 
            ByteTag "natural": 1
 
            Some more attributes ...
 
 
 
Known attributes :
 
 
 
{| class="wikitable"
 
! Name
 
! Type
 
!style="width: 250px;" colspan="2"| Meaning
 
! Values
 
|-
 
| name
 
| String
 
|colspan="2"| Dimension's name
 
| "minecraft:overworld", "minecraft:the_nether", "minecraft:the_end" or something else
 
|-
 
| natural
 
| Byte
 
|colspan="2"| Is it a standard overworld like dimension
 
| 1: true, 0: false
 
|-
 
| ambient_light
 
| Float
 
|colspan="2"| Ambient light
 
| 0.0 to 1.0
 
|-
 
| has_ceiling
 
| Byte
 
|colspan="2"| Does the dimension have blocks on top ? Like the nether
 
| 1: true, 0: false
 
|-
 
| has_skylight
 
 
  | Byte
 
  | Byte
  |colspan="2"| Does the dimension have natural sky light
+
  | Map coordinates: -128 for furthest left, +127 for furthest right
| 1: true, 0: false
 
 
  |-
 
  |-
  | fixed_time
+
  | Z
| Long
 
|colspan="2"| Set fixed minecraft clock time
 
| 0 to 12000
 
|-
 
| shrunk
 
 
  | Byte
 
  | Byte
  |colspan="2"| ?
+
  | Map coordinates: -128 for highest, +127 for lowest
| 1: true, 0: false
 
 
  |-
 
  |-
  | ultrawarm
+
  | Direction
 
  | Byte
 
  | Byte
  |colspan="2"| ?
+
  | 0-15
| 1: true, 0: false
 
|-
 
| has_raids
 
| Byte
 
|colspan="2"| ?
 
| 1: true, 0: false
 
|-
 
| respawn_anchor_works
 
| Byte
 
|colspan="2"| Wether or not respawn anchor can be used
 
| 1: true, 0: false
 
|-
 
| bed_works
 
| Byte
 
|colspan="2"| Wether or not beds can be used
 
| 1: true, 0: false
 
|-
 
| piglin_safe
 
| Byte
 
|colspan="2"| ?
 
| 1: true, 0: false
 
|-
 
| logical_height
 
| Int
 
|colspan="2"| Maybe the world's max height in blocks ?
 
| 0-256
 
|-
 
| infiniburn
 
| String
 
|colspan="2"| ?
 
| "" or minecraft resource "minecraft:..."
 
|}
 
 
 
==== Unlock Recipes ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="14"| {{Change|0x37|0x35}}
 
|rowspan="14"| Play
 
|rowspan="14"| 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.
 
|- {{added}}
 
| Blast Furance Recipe Book Open
 
| Boolean
 
| If true, then the blast furnace recipe book will be open when the player opens its inventory.
 
|- {{added}}
 
| Blast Furance Recipe Book Filter Active
 
| Boolean
 
| If true, then the filtering option is active when the players opens its inventory.
 
|- {{added}}
 
| Smoker Recipe Book Open
 
| Boolean
 
| If true, then the smoker recipe book will be open when the player opens its inventory.
 
|- {{added}}
 
| Smoker Recipe Book Filter Active
 
| Boolean
 
| If true, then the filtering option is active when the players opens its inventory.
 
 
  |-
 
  |-
  | Array size 1
+
  | Has Display Name
| VarInt
 
| Number of elements in the following array
 
|-
 
| Recipe IDs
 
| Array of 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 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.
 
 
 
==== Respawn ====
 
 
 
To change the player's dimension (overworld/nether/end), send them a respawn packet with the appropriate dimension, followed by prechunks/chunks for the new dimension, and finally a position and look packet. You do not need to unload chunks, the client will do it automatically.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="10"| {{Change|0x3B|0x39}}
 
|rowspan="10"| Play
 
|rowspan="10"| Client
 
| Dimension
 
| {{change|Int Enum|Identifier}}
 
| {{change|-1: The Nether, 0: The Overworld, 1: The End|Valid dimensions are defined per dimension registry sent in [[#Join Game|Join Game]]}}
 
|- {{Added}}
 
| World Name
 
| Identifier
 
| Name of the world being spawned into
 
|-
 
| Hashed seed
 
| Long
 
| First 8 bytes of the SHA-256 hash of the world's seed.
 
|- {{Added}}
 
| Gamemode
 
| Unsigned Byte
 
| 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included
 
|- {{Added}}
 
| Previous Gamemode
 
| Unsigned Byte
 
| 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included. The previous gamemode. (More information needed)
 
|- {{Removed}}
 
| Level Type
 
| String (16)
 
| Same as [[#Join Game|Join Game]]
 
|- {{Added}}
 
| Is Debug
 
 
  | Boolean
 
  | Boolean
| True if the world is a {{Minecraft Wiki|debug mode}} world; debug mode worlds cannot be modified and have predefined blocks
 
|- {{Added}}
 
| Is Flat
 
| Boolean
 
| True if the world is a {{Minecraft Wiki|superflat}} world; flat worlds have different void fog and a horizon at y=0 instead of y=63
 
|- {{added}}
 
| Copy metadata
 
| Boolean
 
| If false, metadata is reset on the respawned player entity.  Set to true for dimension changes (including the dimension change triggered by sending client status perform respawn to exit the end poem/credits), and false for normal respawns.
 
|}
 
 
{{Need Info|Does the new World Name field resolve this same-dimension issue?}}
 
 
{{Warning2|Avoid changing player's dimension to same dimension they were already in unless they are dead. If you change the dimension to one they are already in, weird bugs can occur, such as the player being unable to attack other players in new world (until they die and respawn).
 
 
If you must respawn a player in the same dimension without killing them, send two respawn packets, one to a different world and then another to the world you want. You do not need to complete the first respawn; it only matters that you send two packets.}}
 
 
==== Multi Block Change ====
 
 
{| class="wikitable" {{added}}
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="3"| {{Change|0x10|0x3B}}
 
|rowspan="3"| Play
 
|rowspan="3"| Client
 
 
  |
 
  |
| Long
 
| Chunk section coordinate (encoded chunk x and z with each 22 bits, and section y with 20 bits, from left to right)
 
 
  |-
 
  |-
  | Array size
+
  | Display Name
  | VarInt
+
  | Optional [[Chat]]
  | Number of elements in the following array
+
| Only present if previous Boolean is true
 +
|-
 +
|colspan="2"| Columns
 +
|colspan="2"| Unsigned Byte
 +
  | Number of columns updated
 
  |-
 
  |-
  |  
+
  |colspan="2"| Rows
| Array of VarLong
+
  |colspan="2"| Optional Byte
| Each entry is composed of the block id, shifted right by 12, and the relative block position in the chunk section (4 bits for x, z, and y, from left to right).
+
  | Only if Columns is more than 0; number of rows updated
|}
 
 
 
==== Entity Properties ====
 
 
 
Sets {{Minecraft Wiki|Attribute|attributes}} on the given entity.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
!colspan="2"| Field Name
 
  !colspan="2"| Field Type
 
  ! Notes
 
 
  |-
 
  |-
|rowspan="6"| {{change|0x59|0x58}}
+
  |colspan="2"| X
|rowspan="6"| Play
+
  |colspan="2"| Optional Byte
|rowspan="6"| Client
+
  | Only if Columns is more than 0; x offset of the westernmost column
  |colspan="2"| Entity ID
 
  |colspan="2"| VarInt
 
  |  
 
 
  |-
 
  |-
  |colspan="2"| Number Of Properties
+
  |colspan="2"| Z
  |colspan="2"| Int
+
  |colspan="2"| Optional Byte
  | Number of elements in the following array
+
  | Only if Columns is more than 0; z offset of the northernmost row
 
  |-
 
  |-
  |rowspan="4"| Property
+
  |colspan="2"| Length
  | Key
+
  |colspan="2"| Optional VarInt
|rowspan="4"| Array
+
  | Only if Columns is more than 0; length of the following array
| {{Change|String (64)|Identifier}}
 
  | See below
 
 
  |-
 
  |-
  | Value
+
  |colspan="2"| Data
| Double
+
  |colspan="2"| Optional Array of Unsigned Byte
| See below
+
  | Only if Columns is more than 0; see {{Minecraft Wiki|Map item format}}
|-
 
| Number Of Modifiers
 
| VarInt
 
  | Number of elements in the following array
 
|-
 
| Modifiers
 
| Array of Modifier Data
 
  | See {{Minecraft Wiki|Attribute#Modifiers}}. Modifier Data defined below.
 
 
  |}
 
  |}
  
Known Key values (see also {{Minecraft Wiki|Attribute#Modifiers}}):
+
For icons, a direction of 0 is a vertical icon and increments by 22.5&deg; (360/16).
  
{| class="wikitable"
+
Types are based off of rows and columns in <code>map_icons.png</code>:
|-
 
! Key
 
! Default
 
! Min
 
! Max
 
! Label
 
|-
 
| {{change|generic.maxHealth|generic.max_health}}
 
| 20.0
 
| 0.0
 
| 1024.0
 
| Max Health
 
|-
 
| {{change|generic.followRange|generic.follow_range}}
 
| 32.0
 
| 0.0
 
| 2048.0
 
| Follow Range
 
|-
 
| {{change|generic.knockbackResistance|generic.knockback_resistance}}
 
| 0.0
 
| 0.0
 
| 1.0
 
| Knockback Resistance
 
|-
 
| {{change|generic.movementSpeed|generic.movement_speed}}
 
| 0.7
 
| 0.0
 
| 1024.0
 
| Movement Speed
 
|-
 
| {{change|generic.attackDamage|generic.attack_damage}}
 
| 2.0
 
| 0.0
 
| 2048.0
 
| Attack Damage
 
|-
 
| {{change|generic.attackSpeed|generic.attack_speed}}
 
| 4.0
 
| 0.0
 
| 1024.0
 
| Attack Speed
 
|-
 
| {{change|generic.flyingSpeed|generic.flying_speed}}
 
| 0.4
 
| 0.0
 
| 1024.0
 
| Flying Speed
 
|-
 
| generic.armor
 
| 0.0
 
| 0.0
 
| 30.0
 
| Armor
 
|-
 
| {{change|generic.armorToughness|generic.armor_toughness}}
 
| 0.0
 
| 0.0
 
| 20.0
 
| Armor Toughness
 
|-
 
| {{change|generic.attackKnockback|generic.attack_knockback}}
 
| 0.0
 
| 0.0
 
| 5.0
 
| &mdash;
 
|-
 
| generic.luck
 
| 0.0
 
| -1024.0
 
| 1024.0
 
| Luck
 
|-
 
| {{change|horse.jumpStrength|horse.jump_strength}}
 
| 0.7
 
| 0.0
 
| 2.0
 
| Jump Strength
 
|-
 
| {{change|zombie.spawnReinforcements|zombie.spawn_reinforcements}}
 
| 0.0
 
| 0.0
 
| 1.0
 
| Spawn Reinforcements Chance
 
|-
 
| generic.reachDistance
 
| 5.0
 
| 0.0
 
| 1024.0
 
| Player Reach Distance (Forge only)
 
|-
 
| forge.swimSpeed
 
| 1.0
 
| 0.0
 
| 1024.0
 
| Swimming Speed (Forge only)
 
|}
 
 
 
Unknown attributes will cause a game crash ([https://bugs.mojang.com/browse/MC-150405 MC-150405]) due to the default minimum being larger than the default value.
 
 
 
''Modifier Data'' structure:
 
  
 
{| class="wikitable"
 
{| class="wikitable"
 
  |-
 
  |-
  ! Field Name
+
  ! Icon type
  ! Field Type
+
  ! Result
! Notes
 
 
  |-
 
  |-
  | UUID
+
  | 0
| UUID
+
  | White arrow (players)
  |  
 
 
  |-
 
  |-
  | Amount
+
  | 1
  | Double
+
  | Green arrow (item frames)
| May be positive or negative
 
 
  |-
 
  |-
  | Operation
+
  | 2
| Byte
+
  | Red arrow
| See below
 
|}
 
 
 
The operation controls how the base value of the modifier is changed.
 
 
 
* 0: Add/subtract amount
 
* 1: Add/subtract amount percent of the current value
 
* 2: Multiply by amount percent
 
 
 
All of the 0's are applied first, and then the 1's, and then the 2's.
 
 
 
==== Declare Recipes ====
 
 
 
{{Need Info|May have changed in 20w27a}}
 
 
 
{| class="wikitable"
 
  ! Packet ID
 
! State
 
! Bound To
 
!colspan="2"| Field Name
 
!colspan="2"| Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="4"| {{change|0x5B|0x5A}}
+
  | 3
|rowspan="4"| Play
+
  | Blue arrow
|rowspan="4"| Client
 
|colspan="2"| Num Recipes
 
|colspan="2"| VarInt
 
  | Number of elements in the following array
 
 
  |-
 
  |-
  |rowspan="3"| Recipe
+
  | 4
| Recipe ID
+
  | White cross
|rowspan="3"| Array
 
| Identifier
 
  |
 
 
  |-
 
  |-
  | Type
+
  | 5
  | String
+
  | Red pointer
| The recipe type, see below
 
 
  |-
 
  |-
  | Data
+
  | 6
  | Optional, varies
+
  | White circle (off-map players)
| Additional data for the recipe.  For some types, there will be no data.
 
|}
 
 
 
Recipe types:
 
 
 
{| class="wikitable"
 
! Type
 
! Description
 
! Data
 
 
  |-
 
  |-
  | <code>crafting_shapeless</code>
+
  | 7
  | Shapeless crafting recipe.  All items in the ingredient list must be present, but in any order/slot.
+
  | Small white circle (far-off-map players)
| As follows:
 
  {| class="wikitable"
 
    ! Name
 
    ! Type
 
    ! Description
 
    |-
 
    | Group
 
    | String
 
    | Used to group similar recipes together in the recipe book.  Tag is present in recipe JSON.
 
    |-
 
    | Ingredient count
 
    | VarInt
 
    | Number of elements in the following array
 
    |-
 
    | Ingredients
 
    | Array of Ingredient
 
    |
 
    |-
 
    | Result
 
    | [[Slot]]
 
    |
 
    |}
 
 
  |-
 
  |-
  | <code>crafting_shaped</code>
+
  | 8
  | Shaped crafting recipe.  All items must be present in the same pattern (which may be flipped horizontally or translated)
+
  | Mansion
| As follows:
 
  {| class="wikitable"
 
    ! Name
 
    ! Type
 
    ! Description
 
    |-
 
    | Width
 
    | VarInt
 
    |
 
    |-
 
    | Height
 
    | VarInt
 
    |
 
    |-
 
    | Group
 
    | String
 
    | Used to group similar recipes together in the recipe book.  Tag is present in recipe JSON.
 
    |-
 
    | Ingredients
 
    | Array of Ingredient
 
    | Length is width * height.  Indexed by x + (y * width).
 
    |-
 
    | Result
 
    | [[Slot]]
 
    |
 
    |}
 
 
  |-
 
  |-
  | <code>crafting_special_armordye</code>
+
  | 9
  | Recipe for dying leather armor
+
  | Temple
|rowspan="13"| None
 
 
  |-
 
  |-
  | <code>crafting_special_bookcloning</code>
+
  | 10
  | Recipe for copying contents of written books
+
  | White Banner
 
  |-
 
  |-
  | <code>crafting_special_mapcloning</code>
+
  | 11
  | Recipe for copying maps
+
  | Orange Banner
 
  |-
 
  |-
  | <code>crafting_special_mapextending</code>
+
  | 12
  | Recipe for adding paper to maps
+
  | Magenta Banner
 
  |-
 
  |-
  | <code>crafting_special_firework_rocket</code>
+
  | 13
  | Recipe for making firework rockets
+
  | Light Blue Banner
 
  |-
 
  |-
  | <code>crafting_special_firework_star</code>
+
  | 14
  | Recipe for making firework stars
+
  | Yellow Banner
 
  |-
 
  |-
  | <code>crafting_special_firework_star_fade</code>
+
  | 15
  | Recipe for making firework stars fade between multiple colors
+
  | Lime Banner
 
  |-
 
  |-
  | <code>crafting_special_repairitem</code>
+
  | 16
  | Recipe for repairing items via crafting
+
  | Pink Banner
 
  |-
 
  |-
  | <code>crafting_special_tippedarrow</code>
+
  | 17
  | Recipe for crafting tipped arrows
+
  | Gray Banner
 
  |-
 
  |-
  | <code>crafting_special_bannerduplicate</code>
+
  | 18
  | Recipe for copying banner patterns
+
  | Light Gray Banner
 
  |-
 
  |-
  | <code>crafting_special_banneraddpattern</code>
+
  | 19
  | Recipe for adding patterns to banners
+
  | Cyan Banner
 
  |-
 
  |-
  | <code>crafting_special_shielddecoration</code>
+
  | 20
  | Recipe for applying a banner's pattern to a shield
+
  | Purple Banner
 
  |-
 
  |-
  | <code>crafting_special_shulkerboxcoloring</code>
+
  | 21
  | Recipe for recoloring a shulker box
+
  | Blue Banner
 
  |-
 
  |-
  | <code>smelting</code>
+
  | 22
  | Smelting recipe
+
  | Brown Banner
|rowspan="4"| As follows:
 
  {| class="wikitable"
 
    ! Name
 
    ! Type
 
    ! Description
 
    |-
 
    | Group
 
    | String
 
    | Used to group similar recipes together in the recipe book.
 
    |-
 
    | Ingredient
 
    | Ingredient
 
    |
 
    |-
 
    | Result
 
    | [[Slot]]
 
    |
 
    |-
 
    | Experience
 
    | Float
 
    |
 
    |-
 
    | Cooking time
 
    | VarInt
 
    |
 
    |}
 
 
  |-
 
  |-
  | <code>blasting</code>
+
  | 23
  | Blast furnace recipe
+
  | Green Banner
 
  |-
 
  |-
  | <code>smoking</code>
+
  | 24
  | Smoker recipe
+
  | Red Banner
 
  |-
 
  |-
  | <code>campfire_cooking</code>
+
  | 25
  | Campfire recipe
+
  | Black Banner
 
  |-
 
  |-
  | <code>stonecutting</code>
+
  | 26
  | Stonecutter recipe
+
  | Treasure marker
| As follows:
 
  {| class="wikitable"
 
    ! Name
 
    ! Type
 
    ! Description
 
    |-
 
    | Group
 
    | String
 
    | Used to group similar recipes together in the recipe book.  Tag is present in recipe JSON.
 
    |-
 
    | Ingredient
 
    | Ingredient
 
    |
 
    |-
 
    | Result
 
    | [[Slot]]
 
    |
 
    |}
 
|- {{Added}}
 
| <code>smithing</code>
 
| Smithing table recipe
 
| As follows:
 
  {| class="wikitable"
 
    ! Name
 
    ! Type
 
    ! Description
 
    |-
 
    | Base
 
    | Ingredient
 
    | First item
 
    |-
 
    | Addition
 
    | Ingredient
 
    | Second item
 
    |-
 
    | Result
 
    | [[Slot]]
 
    |
 
    |}
 
 
  |}
 
  |}
  
Ingredient is defined as:
 
  
{| class="wikitable"
 
! Name
 
! Type
 
! Description
 
|-
 
| Count
 
| VarInt
 
| Number of elements in the following array
 
|-
 
| Items
 
| Array of [[Slot]]
 
| Any item in this array may be used for the recipe.  The count of each item should be 1.
 
|}
 
  
=== Serverbound ===
+
==== Resource Pack Send ====  
 
 
==== Interact Entity ====
 
 
 
This packet is sent from the client to the server when the client attacks or right-clicks another entity (a player, minecart, etc).
 
 
 
A Notchian server only accepts this packet if the entity being attacked/used is visible without obstruction and within a 4-unit radius of the player's position.
 
 
 
Note that middle-click in creative mode is interpreted by the client and sent as a [[#Creative Inventory Action|Creative Inventory Action]] packet instead.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,325: Line 466:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="7"| 0x0E
+
  |rowspan="3"| 0x38
  |rowspan="7"| Play
+
  |rowspan="3"| Play
  |rowspan="7"| Server
+
  |rowspan="3"| Client
  | Entity ID
+
  | URL
  | VarInt
+
  | String (32767)
  | The ID of the entity to interact
+
  | The URL to the resource pack.
|-
 
| Type
 
| VarInt Enum
 
| 0: interact, 1: attack, 2: interact at
 
|-
 
| Target X
 
| Optional Float
 
| Only if Type is interact at
 
 
  |-
 
  |-
  | Target Y
+
  | Hash
  | Optional Float
+
  | String (40)
| Only if Type is interact at
+
  | A 40 character hexadecimal and lowercase [[wikipedia:SHA-1|SHA-1]] hash of the resource pack file. (must be lower case in order to work)<br />If it's not a 40 character hexadecimal string, the client will not use it for hash verification and likely waste bandwidth — but it will still treat it as a unique id
  |-
 
| Target Z
 
| Optional Float
 
| Only if Type is interact at
 
|-
 
| Hand
 
| Optional VarInt Enum
 
| Only if Type is interact or interact at; 0: main hand, 1: off hand
 
 
  |- {{Added}}
 
  |- {{Added}}
  | Sneaking
+
  | Forced
 
  | Boolean
 
  | Boolean
  | If the client is sneaking.
+
  | The notchian client will be forced to use the ressource pack from the server. If they decline they will be kicked from the server.
 
  |}
 
  |}
  
==== Generate Structure ====
 
  
Sent when Generate is pressed on the {{Minecraft Wiki|Jigsaw Block}} interface.
+
=== Serverbound ===
  
{| class="wikitable" {{added}}
+
No changes so far.
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="3"| 0x0F
 
|rowspan="3"| Play
 
|rowspan="3"| Server
 
| Location
 
| Position
 
| Block entity location
 
|-
 
| Levels
 
| VarInt
 
| Value of the levels slider/max depth to generate
 
|-
 
| Keep Jigsaws
 
| Boolean
 
|
 
|}
 
 
 
==== Player Abilities (serverbound) ====
 
 
 
{{change|The latter 2 fields are used to indicate the walking and flying speeds respectively, while the first field is used to determine the value of 4 booleans.}}
 
 
 
The vanilla client sends this packet when the player starts/stops flying with the Flags parameter changed accordingly. {{change|All other parameters are ignored by the vanilla server.}}
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="3"| {{change|0x19|0x1A}}
 
|rowspan="3"| Play
 
|rowspan="3"| Server
 
| Flags
 
| Byte
 
| Bit mask. {{change|0x08: damage disabled (god mode), 0x04: can fly, }}0x02: is flying{{change|, 0x01: is Creative}}
 
|- {{removed}}
 
| Flying Speed
 
| Float
 
|
 
|- {{removed}}
 
| Walking Speed
 
| Float
 
|
 
|}
 
 
 
==== Set Displayed Recipe ====
 
 
 
Replaces Recipe Book Data, type 0.
 
 
 
{| class="wikitable" {{Added}}
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="1"| 0x1E
 
|rowspan="1"| Play
 
|rowspan="1"| Server
 
| Recipe ID
 
| Identifier
 
|
 
|}
 
 
 
==== Set Recipe Book State ====
 
 
 
Replaces Recipe Book Data, type 1.
 
 
 
{| class="wikitable" {{Added}}
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="3"| 0x1F
 
|rowspan="3"| Play
 
|rowspan="3"| Server
 
| Book ID
 
| VarInt enum
 
| 0: crafting, 1: furnace, 2: blast furnace, 3: smoker
 
|-
 
| Book Open
 
| Boolean
 
|
 
|-
 
| Filter Active
 
| Boolean
 
|
 
|}
 
 
 
==== Update Jigsaw Block ====
 
 
 
Sent when Done is pressed on the {{Minecraft Wiki|Jigsaw Block}} interface.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="7"| {{Change|0x27|0x28}}
 
|rowspan="7"| Play
 
|rowspan="7"| Server
 
| Location
 
| Position
 
| Block entity location
 
|- {{Removed}}
 
| Attachment type
 
| Identifier
 
|
 
|- {{Added}}
 
| Name
 
| Identifier
 
|
 
|- {{Added}}
 
| Target
 
| Identifier
 
|
 
|-
 
| {{Change|Target pool|Pool}}
 
| Identifier
 
|
 
|-
 
| Final state
 
| String
 
| "Turns into" on the GUI, <code>final_state</code> in NBT
 
|- {{Added}}
 
| Joint type
 
| String
 
| <code>rollable</code> if the attached piece can be rotated, else <code>aligned</code>
 
|}
 
 
 
==== Entity Equipment ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
!colspan="2"| Field Name
 
!colspan="2"| Field Type
 
! Notes
 
|-
 
|rowspan="5"| 0x47
 
|rowspan="5"| Play
 
|rowspan="5"| Client
 
|colspan="2"| Entity ID
 
|colspan="2"| VarInt
 
| Entity's EID
 
|- {{Removed}}
 
|colspan="2"| Slot
 
|colspan="2"| VarInt Enum
 
| Equipment slot. 0: main hand, 1: off hand, 2–5: armor slot (2: boots, 3: leggings, 4: chestplate, 5: helmet)
 
|- {{Removed}}
 
|colspan="2"| Item
 
|colspan="2"| [[Slot Data|Slot]]
 
|
 
|-
 
|rowspan="2"| Equipment
 
| Slot
 
|rowspan="2"| Array
 
| Byte Enum
 
| Equipment slot. 0: main hand, 1: off hand, 2–5: armor slot (2: boots, 3: leggings, 4: chestplate, 5: helmet).  Also has the top bit set if another entry follows, and otherwise unset if this is the last item in the array.
 
|-
 
| Item
 
| [[Slot Data|Slot]]
 
|
 
|}
 
  
 
== Handshaking ==
 
== Handshaking ==
Line 1,568: Line 512:
 
  | Protocol Version
 
  | Protocol Version
 
  | VarInt
 
  | VarInt
  | See [[protocol version numbers]] (currently {{change|578|738}})
+
  | See [[protocol version numbers]] (currently {{change|754|1073741831}})
 
  |-
 
  |-
 
  | Server Address
 
  | Server Address
Line 1,597: Line 541:
 
=== Clientbound ===
 
=== Clientbound ===
  
==== Login Success ====
+
No changes so far.
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="2"| 0x02
 
|rowspan="2"| Login
 
|rowspan="2"| Client
 
| UUID
 
| {{Change|String (36)|UUID}}
 
| {{Change|Unlike in other packets, this field contains the UUID as a string with hyphens}}.
 
|-
 
| Username
 
| String (16)
 
|
 
|}
 
 
 
This packet switches the connection state to [[#Play|play]].
 
  
 
=== Serverbound ===
 
=== Serverbound ===

Latest revision as of 03:48, 1 December 2020

This page documents the changes from the last stable Minecraft release (currently 1.16.4, protocol 754) to the current pre-release (currently 20w48a, protocol 1073741831). 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
Play clientbound
0x20 Chunk Data Current Pre
0x23 Update Light Current Pre
0x25 Map Data Current Pre
0x38 Resource Pack Send Current Pre
Handshaking serverbound
0x00 Handshake Current Pre

New/modified data types

No changes so far.

Entity Metadata

Warning.png Note that other entities have had metadata shifts due to these changes, not shown here.

Entity

The base class.

Index Type Meaning Default
0 Byte Bit mask Meaning 0
0x01 Is on fire
0x02 Is crouching
0x04 Unused (previously riding)
0x08 Is sprinting
0x10 Is swimming
0x20 Is invisible
0x40 has glowing effect
0x80 Is flying with an elytra
1 VarInt Air ticks 300
2 OptChat Custom name empty
3 Boolean Is custom name visible false
4 Boolean Is silent false
5 Boolean Has no gravity false
6 Pose Pose STANDING
7 VarInt Ticks frozen in powdered snow 0

Block Actions

No changes so far.

Inventories

No changes so far.

Plugin Channels

No changes so far.

Play

Clientbound

Chunk Data

Main article: Chunk Format
See also: #Unload Chunk
Huh.png The following information needs to be added to this page:
How do biomes work now? The biome change happened at the same time as the seed change, but it's not clear how/if biomes could be computed given that it's not the actual seed... (/r/mojira discussion which notes that it seems to be some kind of interpolation, and 3D biomes are only used in the nether)

The server only sends skylight information for chunk pillars in the Overworld, it's up to the client to know in which dimension the player is currently located. You can also infer this information from the primary bitmask and the amount of uncompressed bytes sent. This packet also sends all block entities in the chunk (though sending them is not required; it is still legal to send them with Update Block Entity later).

Packet ID State Bound To Field Name Field Type Notes
0x20 Play Client Chunk X Int Chunk coordinate (block coordinate divided by 16, rounded down)
Chunk Z Int Chunk coordinate (block coordinate divided by 16, rounded down)
Full chunk Boolean See Chunk Format
Primary Bit Mask VarInt Bitmask with bits set to 1 for every 16×16×16 chunk section whose data is included in Data. The least significant bit represents the chunk section at the bottom of the chunk column (from y=0 to y=15).
Heightmaps NBT Compound containing one long array named MOTION_BLOCKING, which is a heightmap for the highest solid block at each position in the chunk (as a compacted long array with 256 entries at 9 bits per entry totaling 36 longs). The Notchian server also adds a WORLD_SURFACE long array, the purpose of which is unknown, but it's not required for the chunk to be accepted.
Biomes length Optional VarInt Size of the following array. Not present if full chunk is false.
Biomes Optional array of VarInt 1024 biome IDs, ordered by x then z then y, in 4×4×4 blocks.Possibly something else. Not present if full chunk is false.
Size VarInt Size of Data in bytes
Data Byte array See data structure in Chunk Format
Number of block entities VarInt Number of elements in the following array
Block entities Array of NBT Tag All block entities in the chunk. Use the x, y, and z tags in the NBT to determine their positions.

Note that the Notchian client requires an Update View Position packet when it crosses a chunk border, otherwise it'll only display render distance + 2 chunks around the chunk it spawned in.

The compacted array format has been adjusted so that individual entries no longer span across multiple longs, affecting the main data array and heightmaps.

New format, 5 bits per block, containing the following references to blocks in a palette (not shown): 122344566480743131516914101202

0020863148418841 0000000000100000100001100011000101001000010000011000100001000001
01018A7260F68C87 0000000100000001100010100111001001100000111101101000110010000111


Update Light

Updates light levels for a chunk.

Packet ID State Bound To Field Name Field Type Notes
0x23 Play Client Chunk X VarInt Chunk coordinate (block coordinate divided by 16, rounded down)
Chunk Z VarInt Chunk coordinate (block coordinate divided by 16, rounded down)
Trust Edges Boolean If edges should be trusted for light updates.
? (Changes unknown) VarInt VarLong ? (Changes unknown)
? (Changes unknown) VarInt VarLong ? (Changes unknown)
? (Changes unknown) VarInt VarLong ? (Changes unknown)
? (Changes unknown) VarInt VarLong ? (Changes unknown)
Sky Light arrays Length Array VarInt Length of the following array in bytes (always 2048)
Sky Light array Array of 2048 bytes There is 1 array for each bit set to true in the sky light mask, starting with the lowest value. Half a byte per light value.
Block Light arrays Length Array VarInt Length of the following array in bytes (always 2048)
Block Light array Array of 2048 bytes There is 1 array for each bit set to true in the block light mask, starting with the lowest value. Half a byte per light value.



Map Data

Updates a rectangular area on a map item.

Packet ID State Bound To Field Name Field Type Notes
0x25 Play Client Map ID VarInt 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 player and item frame icons are shown
Locked Boolean True if the map has been locked in a cartography table
Tracking Position Boolean Specifies whether player and item frame icons are shown
Icon Count VarInt Number of elements in the following array. Only present if "Tracking Position" is true.
Icon Type Array VarInt enum See below
X Byte Map coordinates: -128 for furthest left, +127 for furthest right
Z Byte Map coordinates: -128 for highest, +127 for lowest
Direction Byte 0-15
Has Display Name Boolean
Display Name Optional Chat Only present if previous Boolean is true
Columns Unsigned 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


Resource Pack Send

Packet ID State Bound To Field Name Field Type Notes
0x38 Play Client URL String (32767) The URL to the resource pack.
Hash String (40) A 40 character hexadecimal and lowercase SHA-1 hash of the resource pack file. (must be lower case in order to work)
If it's not a 40 character hexadecimal string, the client will not use it for hash verification and likely waste bandwidth — but it will still treat it as a unique id
Forced Boolean The notchian client will be forced to use the ressource pack from the server. If they decline they will be kicked from the server.


Serverbound

No changes so far.

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 754 1073741831)
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. Note that SRV records are a complete redirect, e.g. if _minecraft._tcp.example.com points to mc.example.org, users connecting to example.com will provide mc.example.org as server address in addition to connecting to it.
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

No changes so far.

Serverbound

No changes so far.