Difference between revisions of "Pre-release protocol"

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This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently 1.6.2, protocol 74) to the current pre-release. 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|1.20.4, protocol 765]]) to the current pre-release (currently [[Protocol version numbers|24w13a, protocol {{Snapshot PVN|1073742006}}]]). Note that this page contains bleeding-edge information that may not be completely or correctly documented.
He 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 occured to the respective packets there.
 
  
== Protocol History ==
+
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.
=== 13w36a ===
 
* Added sound category byte to 0x3E
 
* Changed 0xC8 to a string:int map
 
  
=== 13w37b ===  
+
== Contents ==
  
=== 1.6.3 ===
+
<div style="float:right;">__TOC__</div>
* Terrain fixes to help moving to 1.7, no packet changes from 1.6.2
 
  
=== 1.6.4 ===
+
=== Data types ===
  
=== 13w38a/b/c ===
+
No changes so far.
  
=== 13w39a/b ===
+
=== Packets ===
* UUIDs added to spawn named entity
 
* Game state 'gamemode' byte -> float
 
 
 
=== 13w41a ===
 
* Large protocol rework
 
 
 
=== 13w41b ===
 
''Note this isn't backwards compatible with 13w41a due to Handshakes's Server Port type change''
 
* Removed Player (Clientbound), Player Position (Clientbound), Player Look (Clientbound)
 
* Removed Player Position and Look (Clientbound)'s 'Stance' 
 
* Removed Join Game's 'N/A' and 'Level Type'
 
* Changed Join Game's 'Gamemode' 'Difficulty' 'Max Players' types to Unsigned Byte
 
* Changed Handshake's 'Server Port' type to Unsigned Short
 
* Removed Respawn's 'World Height' 'Level Type'
 
* Changed Respawn's 'Difficulty' and 'Gamemode' types to Unsigned Byte
 
* Changed Held Item Change's 'Slot' type to Byte
 
* Removed Use Bed's 'unknown byte'
 
* Changed Animation's 'Animation' type to Unsigned Byte
 
* Changed Spawn Player's 'Entity ID' type to VarInt
 
* Changed Spawn Object's 'Entity ID' type to VarInt
 
* Changed Spawn Mob's 'Entity ID' type to VarInt
 
* Changed Spawn Painting's 'Entity ID' type to VarInt
 
* Changed Spawn Experience Orb's 'Entity ID' type to VarInt
 
* Changed Multi Block Change's 'Chunk X' and 'Chunk Z' types to VarInt
 
* Changed Block Change's 'Block Type' type to VarInt
 
* Changed Block Action's 'Block Type' type to VarInt
 
* Changed Block Break Animation's 'Entity ID' type to VarInt
 
* Changed Explosion's 'X' 'Y' and 'Z' types to Float
 
* Changed Change Game State's 'Reason' type to Unsigned Byte
 
* Changed Spawn Global Entity's 'Entity ID' type to VarInt
 
* Changed Close Window's 'Window ID' type to Unsigned Byte
 
* Changed Set Slot's 'Window ID' type to Unsigned Byte
 
* Changed Window Items's 'Window ID' type to Unsigned Byte
 
* Changed Window Property's 'Window ID' type to Unsigned Byte
 
* Changed Comfirm Transaction's 'Window ID' type to Unsigned Byte
 
* Changed Maps' 'Item Damage' type to VarInt
 
* Removed Maps' 'Item Type'
 
* Changed Update Block Entity's 'Action' type to Unsigned Byte
 
* Block Editor Open -> Sign Editor Open
 
* Removed Sign Editor Open's 'Tile Entity Id'
 
* Changed Statistics's 'Count' and 'Amount' types to VarInt
 
* Changed Tab-Complete from \x00 String to Array of Strings
 
 
 
== Protocol Version ==
 
13w41b - 0 ''Note this isn't backwards compatible with 13w41a due to Handshakes's Server Port type change''
 
 
 
13w41a - 0
 
 
 
13w39a/b - 80
 
 
 
13w38a/b/c - 79
 
 
 
1.6.4 - 78
 
 
 
1.6.3 - 77
 
 
 
13w37b - 76
 
 
 
13w36a - 75
 
 
 
== Packet format ==
 
  
 
{| class="wikitable"
 
{| class="wikitable"
! Field Name !! Field Type !! Notes
+
! ID
|-
+
! Packet name
| Length || VarInt || Includes the type's length
+
!colspan="2"| Documentation
|-
+
|-
| Type || VarInt ||
+
!colspan="4"| Handshake serverbound
|-
+
{{PacketList|0x00|Handshake}}
| Data || ||
+
|-
|}
+
!colspan="4"| Login clientbound
 +
{{PacketList|0x01|Encryption Request}}
 +
{{PacketList|0x05|Cookie Request (login)|rel=added}}
 +
|-
 +
!colspan="4"| Login serverbound
 +
{{PacketList|0x04|Cookie Response (login)|rel=added}}
 +
|-
 +
!colspan="4"| Configuration clientbound
 +
{{PacketList|0x00|Cookie Request (configuration)|rel=added}}
 +
{{PacketList|{{change|0x00|0x01}}|Clientbound Plugin Message (configuration)|pre=unchanged}}
 +
{{PacketList|{{change|0x01|0x02}}|Disconnect (configuration)|pre=unchanged}}
 +
{{PacketList|{{change|0x02|0x03}}|Finish Configuration|pre=unchanged}}
 +
{{PacketList|{{change|0x03|0x04}}|Clientbound Keep Alive (configuration)|pre=unchanged}}
 +
{{PacketList|{{change|0x04|0x05}}|Ping (configuration)|pre=unchanged}}
 +
{{PacketList|0x06|Reset Chat|rel=added}}
 +
{{PacketList|{{change|0x05|0x07}}|Registry Data}}
 +
{{PacketList|{{change|0x06|0x08}}|Remove Resource Pack (configuration)|pre=unchanged}}
 +
{{PacketList|{{change|0x07|0x09}}|Add Resource Pack (configuration)|pre=unchanged}}
 +
{{PacketList|0x0A|Store Cookie (configuration)|rel=added}}
 +
{{PacketList|0x0B|Transfer (configuration)|rel=added}}
 +
{{PacketList|{{change|0x08|0x0C}}|Feature Flags|pre=unchanged}}
 +
{{PacketList|{{change|0x09|0x0D}}|Update Tags (configuration)|pre=unchanged}}
 +
{{PacketList|0x0E|Clientbound Known Packs|rel=added}}
 +
|-
 +
!colspan="4"| Configuration serverbound
 +
{{PacketList|0x01|Cookie Response (configuration)|rel=added}}
 +
{{PacketList|{{change|0x01|0x02}}|Serverbound Plugin Message (configuration)|pre=unchanged}}
 +
{{PacketList|{{change|0x02|0x03}}|Finish Configuration|pre=unchanged}}
 +
{{PacketList|{{change|0x03|0x04}}|Serverbound Keep Alive (configuration)|pre=unchanged}}
 +
{{PacketList|{{change|0x04|0x05}}|Pong (configuration)|pre=unchanged}}
 +
{{PacketList|{{change|0x05|0x06}}|Resource Pack Response (configuration)|pre=unchanged}}
 +
{{PacketList|0x07|Serverbound Known Packs|rel=added}}
 +
|-
 +
!colspan="4"| Play clientbound
 +
{{PacketList|0x16|Cookie Request (Play)|rel=added}}
 +
{{PacketList|{{change|0x16|0x17}}|Set Cooldown|pre=unchanged}}
 +
{{PacketList|{{change|0x17|0x18}}|Chat Suggestions|pre=unchanged}}
 +
{{PacketList|{{change|0x18|0x19}}|Clientbound Plugin Message (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x19|0x1A}}|Damage Event|pre=unchanged}}
 +
{{PacketList|0x1B|Debug Sample|rel=added}}
 +
{{PacketList|{{change|0x1A|0x1C}}|Delete Message|pre=unchanged}}
 +
{{PacketList|{{change|0x1B|0x1D}}|Disconnect (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x1C|0x1E}}|Disguised Chat Message|pre=unchanged}}
 +
{{PacketList|{{change|0x1D|0x1F}}|Entity Event|pre=unchanged}}
 +
{{PacketList|{{change|0x1E|0x20}}|Explosion|pre=unchanged}}
 +
{{PacketList|{{change|0x1F|0x21}}|Unload Chunk|pre=unchanged}}
 +
{{PacketList|{{change|0x20|0x22}}|Game Event|pre=unchanged}}
 +
{{PacketList|{{change|0x21|0x23}}|Open Horse Screen|pre=unchanged}}
 +
{{PacketList|{{change|0x22|0x24}}|Hurt Animation|pre=unchanged}}
 +
{{PacketList|{{change|0x23|0x25}}|Initialize World Border|pre=unchanged}}
 +
{{PacketList|{{change|0x24|0x26}}|Clientbound Keep Alive (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x25|0x27}}|Chunk Data and Update Light|pre=unchanged}}
 +
{{PacketList|{{change|0x26|0x28}}|World Event|pre=unchanged}}
 +
{{PacketList|{{change|0x27|0x29}}|Particle|pre=unchanged}}
 +
{{PacketList|{{change|0x28|0x2A}}|Update Light|pre=unchanged}}
 +
{{PacketList|{{change|0x29|0x2B}}|Login (play)}}
 +
{{PacketList|{{change|0x2A|0x2C}}|Map Data|pre=unchanged}}
 +
{{PacketList|{{change|0x2B|0x2D}}|Merchant Offers|pre=unchanged}}
 +
{{PacketList|{{change|0x2C|0x2E}}|Update Entity Position|pre=unchanged}}
 +
{{PacketList|{{change|0x2D|0x2F}}|Update Entity Position and Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x2E|0x30}}|Update Entity Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x2F|0x31}}|Move Vehicle|pre=unchanged}}
 +
{{PacketList|{{change|0x30|0x32}}|Open Book|pre=unchanged}}
 +
{{PacketList|{{change|0x31|0x33}}|Open Screen|pre=unchanged}}
 +
{{PacketList|{{change|0x32|0x34}}|Open Sign Editor|pre=unchanged}}
 +
{{PacketList|{{change|0x33|0x35}}|Ping (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x34|0x36}}|Ping Response (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x35|0x37}}|Place Ghost Recipe|pre=unchanged}}
 +
{{PacketList|{{change|0x36|0x38}}|Player Abilities|pre=unchanged}}
 +
{{PacketList|{{change|0x37|0x39}}|Player Chat Message|pre=unchanged}}
 +
{{PacketList|{{change|0x38|0x3A}}|End Combat|pre=unchanged}}
 +
{{PacketList|{{change|0x39|0x3B}}|Enter Combat|pre=unchanged}}
 +
{{PacketList|{{change|0x3A|0x3C}}|Combat Death|pre=unchanged}}
 +
{{PacketList|{{change|0x3B|0x3D}}|Player Info Remove|pre=unchanged}}
 +
{{PacketList|{{change|0x3C|0x3E}}|Player Info Update|pre=unchanged}}
 +
{{PacketList|{{change|0x3D|0x3F}}|Look At|pre=unchanged}}
 +
{{PacketList|{{change|0x3E|0x40}}|Synchronize Player Position|pre=unchanged}}
 +
{{PacketList|{{change|0x3F|0x41}}|Update Recipe Book|pre=unchanged}}
 +
{{PacketList|{{change|0x40|0x42}}|Remove Entities|pre=unchanged}}
 +
{{PacketList|{{change|0x41|0x43}}|Remove Entity Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x42|0x44}}|Reset Score|pre=unchanged}}
 +
{{PacketList|{{change|0x43|0x45}}|Remove Resource Pack (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x44|0x46}}|Add Resource Pack (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x45|0x47}}|Respawn}}
 +
{{PacketList|{{change|0x46|0x48}}|Set Head Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x47|0x49}}|Update Section Blocks|pre=unchanged}}
 +
{{PacketList|{{change|0x48|0x4A}}|Select Advancements Tab|pre=unchanged}}
 +
{{PacketList|{{change|0x49|0x4B}}|Server Data|pre=unchanged}}
 +
{{PacketList|{{change|0x4A|0x4C}}|Set Action Bar Text|pre=unchanged}}
 +
{{PacketList|{{change|0x4B|0x4D}}|Set Border Center|pre=unchanged}}
 +
{{PacketList|{{change|0x4C|0x4E}}|Set Border Lerp Size|pre=unchanged}}
 +
{{PacketList|{{change|0x4D|0x4F}}|Set Border Size|pre=unchanged}}
 +
{{PacketList|{{change|0x4E|0x50}}|Set Border Warning Delay|pre=unchanged}}
 +
{{PacketList|{{change|0x4F|0x51}}|Set Border Warning Distance|pre=unchanged}}
 +
{{PacketList|{{change|0x50|0x52}}|Set Camera|pre=unchanged}}
 +
{{PacketList|{{change|0x51|0x53}}|Set Held Item|pre=unchanged}}
 +
{{PacketList|{{change|0x52|0x54}}|Set Center Chunk|pre=unchanged}}
 +
{{PacketList|{{change|0x53|0x55}}|Set Render Distance|pre=unchanged}}
 +
{{PacketList|{{change|0x54|0x56}}|Set Default Spawn Position|pre=unchanged}}
 +
{{PacketList|{{change|0x55|0x57}}|Display Objective|pre=unchanged}}
 +
{{PacketList|{{change|0x56|0x58}}|Set Entity Metadata|pre=unchanged}}
 +
{{PacketList|{{change|0x57|0x59}}|Link Entities|pre=unchanged}}
 +
{{PacketList|{{change|0x58|0x5A}}|Set Entity Velocity|pre=unchanged}}
 +
{{PacketList|{{change|0x59|0x5B}}|Set Equipment|pre=unchanged}}
 +
{{PacketList|{{change|0x5A|0x5C}}|Set Experience|pre=unchanged}}
 +
{{PacketList|{{change|0x5B|0x5D}}|Set Health|pre=unchanged}}
 +
{{PacketList|{{change|0x5C|0x5E}}|Update Objectives|pre=unchanged}}
 +
{{PacketList|{{change|0x5D|0x5F}}|Set Passengers|pre=unchanged}}
 +
{{PacketList|{{change|0x5E|0x60}}|Update Teams|pre=unchanged}}
 +
{{PacketList|{{change|0x5F|0x61}}|Update Score|pre=unchanged}}
 +
{{PacketList|{{change|0x60|0x62}}|Set Simulation Distance|pre=unchanged}}
 +
{{PacketList|{{change|0x61|0x63}}|Set Subtitle Text|pre=unchanged}}
 +
{{PacketList|{{change|0x62|0x64}}|Update Time|pre=unchanged}}
 +
{{PacketList|{{change|0x63|0x65}}|Set Title Text|pre=unchanged}}
 +
{{PacketList|{{change|0x64|0x66}}|Set Title Animation Times|pre=unchanged}}
 +
{{PacketList|{{change|0x65|0x67}}|Entity Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x66|0x68}}|Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x67|0x69}}|Start Configuration|pre=unchanged}}
 +
{{PacketList|{{change|0x68|0x6A}}|Stop Sound|pre=unchanged}}
 +
{{PacketList|0x6B|Store Cookie (Play)|rel=added}}
 +
{{PacketList|{{change|0x69|0x6C}}|System Chat Message|pre=unchanged}}
 +
{{PacketList|{{change|0x6A|0x6D}}|Set Tab List Header And Footer|pre=unchanged}}
 +
{{PacketList|{{change|0x6B|0x6E}}|Tag Query Response|pre=unchanged}}
 +
{{PacketList|{{change|0x6C|0x6F}}|Pickup Item|pre=unchanged}}
 +
{{PacketList|{{change|0x6D|0x70}}|Teleport Entity|pre=unchanged}}
 +
{{PacketList|{{change|0x6E|0x71}}|Set Ticking State|pre=unchanged}}
 +
{{PacketList|{{change|0x6F|0x72}}|Step Tick|pre=unchanged}}
 +
{{PacketList|0x73|Transfer (Play)|rel=added}}
 +
{{PacketList|{{change|0x70|0x74}}|Update Advancements|pre=unchanged}}
 +
{{PacketList|{{change|0x71|0x75}}|Update Attributes}}
 +
{{PacketList|{{change|0x72|0x76}}|Entity Effect}}
 +
{{PacketList|{{change|0x73|0x77}}|Update Recipes|pre=unchanged}}
 +
{{PacketList|{{change|0x74|0x78}}|Update Tags (play)|pre=unchanged}}
 +
|-
 +
!colspan="4"| Play serverbound
 +
{{PacketList|0x04|Chat Command}}
 +
{{PacketList|0x05|Signed Chat Command|rel=added}}
 +
{{PacketList|{{change|0x05|0x06}}|Chat Message|pre=unchanged}}
 +
{{PacketList|{{change|0x06|0x07}}|Player Session|pre=unchanged}}
 +
{{PacketList|{{change|0x07|0x08}}|Chunk Batch Received|pre=unchanged}}
 +
{{PacketList|{{change|0x08|0x09}}|Client Status|pre=unchanged}}
 +
{{PacketList|{{change|0x09|0x0A}}|Client Information (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x0A|0x0B}}|Command Suggestions Request|pre=unchanged}}
 +
{{PacketList|{{change|0x0B|0x0C}}|Acknowledge Configuration|pre=unchanged}}
 +
{{PacketList|{{change|0x0C|0x0D}}|Click Container Button|pre=unchanged}}
 +
{{PacketList|{{change|0x0D|0x0E}}|Click Container|pre=unchanged}}
 +
{{PacketList|{{change|0x0E|0x0F}}|Close Container|pre=unchanged}}
 +
{{PacketList|{{change|0x0F|0x10}}|Change Container Slot State|pre=unchanged}}
 +
{{PacketList|0x11|Cookie Response (play)|rel=added}}
 +
{{PacketList|{{change|0x10|0x12}}|Serverbound Plugin Message (play)|pre=unchanged}}
 +
{{PacketList|0x13|Debug Sample Subscription|rel=added}}
 +
{{PacketList|{{change|0x11|0x14}}|Edit Book|pre=unchanged}}
 +
{{PacketList|{{change|0x12|0x15}}|Query Entity Tag|pre=unchanged}}
 +
{{PacketList|{{change|0x13|0x16}}|Interact|pre=unchanged}}
 +
{{PacketList|{{change|0x14|0x17}}|Jigsaw Generate|pre=unchanged}}
 +
{{PacketList|{{change|0x15|0x18}}|Serverbound Keep Alive (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x16|0x19}}|Lock Difficulty|pre=unchanged}}
 +
{{PacketList|{{change|0x17|0x1A}}|Set Player Position|pre=unchanged}}
 +
{{PacketList|{{change|0x18|0x1B}}|Set Player Position and Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x19|0x1C}}|Set Player Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x1A|0x1D}}|Set Player On Ground|pre=unchanged}}
 +
{{PacketList|{{change|0x1B|0x1E}}|Move Vehicle|pre=unchanged}}
 +
{{PacketList|{{change|0x1C|0x1F}}|Paddle Boat|pre=unchanged}}
 +
{{PacketList|{{change|0x1D|0x20}}|Pick Item|pre=unchanged}}
 +
{{PacketList|{{change|0x1E|0x21}}|Ping Request (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x1F|0x22}}|Place Recipe|pre=unchanged}}
 +
{{PacketList|{{change|0x20|0x23}}|Player Abilities|pre=unchanged}}
 +
{{PacketList|{{change|0x21|0x24}}|Player Action|pre=unchanged}}
 +
{{PacketList|{{change|0x22|0x25}}|Player Command|pre=unchanged}}
 +
{{PacketList|{{change|0x23|0x26}}|Player Input|pre=unchanged}}
 +
{{PacketList|{{change|0x24|0x27}}|Pong (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x25|0x28}}|Change Recipe Book Settings|pre=unchanged}}
 +
{{PacketList|{{change|0x26|0x29}}|Set Seen Recipe|pre=unchanged}}
 +
{{PacketList|{{change|0x27|0x2A}}|Rename Item|pre=unchanged}}
 +
{{PacketList|{{change|0x28|0x2B}}|Resource Pack Response (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x29|0x2C}}|Seen Advancements|pre=unchanged}}
 +
{{PacketList|{{change|0x2A|0x2D}}|Select Trade|pre=unchanged}}
 +
{{PacketList|{{change|0x2B|0x2E}}|Set Beacon Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x2C|0x2F}}|Set Held Item|pre=unchanged}}
 +
{{PacketList|{{change|0x2D|0x30}}|Program Command Block|pre=unchanged}}
 +
{{PacketList|{{change|0x2E|0x31}}|Program Command Block Minecart|pre=unchanged}}
 +
{{PacketList|{{change|0x2F|0x32}}|Set Creative Mode Slot|pre=unchanged}}
 +
{{PacketList|{{change|0x30|0x33}}|Program Jigsaw Block|pre=unchanged}}
 +
{{PacketList|{{change|0x31|0x34}}|Program Structure Block|pre=unchanged}}
 +
{{PacketList|{{change|0x32|0x35}}|Update Sign|pre=unchanged}}
 +
{{PacketList|{{change|0x33|0x36}}|Swing Arm|pre=unchanged}}
 +
{{PacketList|{{change|0x34|0x37}}|Teleport To Entity|pre=unchanged}}
 +
{{PacketList|{{change|0x35|0x38}}|Use Item On|pre=unchanged}}
 +
{{PacketList|{{change|0x36|0x39}}|Use Item|pre=unchanged}}
 +
|}
  
== Data Types ==
+
== New/modified data types ==
  
VarInt - [http://developers.google.com/protocol-buffers/docs/encoding#varints Protocol Buffer 32-bit Varint]
+
No changes so far.
  
String - UTF-8 String prefixed with a VarInt
+
== Entity Metadata ==
  
== Handshaking ==
+
{{#vardefine: meta_prerelease | 1}}
  
=== Serverbound ===
+
{{Metadata type definition/begin}}
 +
! Value
 +
! Notes
 +
{{Metadata type definition|Byte}}
 +
| {{Type|Byte}}
 +
|
 +
{{Metadata type definition|VarInt}}
 +
| {{Type|VarInt}}
 +
|
 +
{{Metadata type definition|VarLong}}
 +
| {{Type|VarLong}}
 +
|
 +
{{Metadata type definition|Float}}
 +
| {{Type|Float}}
 +
|
 +
{{Metadata type definition|String}}
 +
| {{Type|String}}
 +
|
 +
{{Metadata type definition|Text Component}}
 +
| {{Type|Text Component}}
 +
|
 +
{{Metadata type definition|Optional Text Component}}
 +
| ({{Type|Boolean}}, {{Type|Optional}} {{Type|Text Component}})
 +
| Text Component is present if the Boolean is set to true.
 +
{{Metadata type definition|Slot}}
 +
| {{Type|Slot}}
 +
|
 +
{{Metadata type definition|Boolean}}
 +
| {{Type|Boolean}}
 +
|
 +
{{Metadata type definition|Rotations}}
 +
| ({{Type|Float}}, {{Type|Float}}, {{Type|Float}})
 +
| rotation on x, rotation on y, rotation on z
 +
{{Metadata type definition|Position}}
 +
| {{Type|Position}}
 +
|
 +
{{Metadata type definition|Optional Position}}
 +
| ({{Type|Boolean}}, {{Type|Optional}} {{Type|Position}})
 +
| Position is present if the Boolean is set to true.
 +
{{Metadata type definition|Direction}}
 +
| {{Type|VarInt}} {{Type|Enum}}
 +
| Down = 0, Up = 1, North = 2, South = 3, West = 4, East = 5
 +
{{Metadata type definition|Optional UUID}}
 +
| ({{Type|Boolean}}, {{Type|Optional}} {{Type|UUID}})
 +
| UUID is present if the Boolean is set to true.
 +
{{Metadata type definition|Block State}}
 +
| {{Type|VarInt}}
 +
| An ID in the block state registry.
 +
{{Metadata type definition|Optional Block State}}
 +
| {{Type|VarInt}}
 +
| 0 for absent (air is unrepresentable); otherwise, an ID in the block state registry.
 +
{{Metadata type definition|NBT}}
 +
| {{Type|NBT}}
 +
|
 +
{{Metadata type definition|Particle}}
 +
| ({{Type|VarInt}}, Varies)
 +
| particle type (an ID in the <code>minecraft:particle_type</code> registry), particle data (See [[Particles]].)
 +
{{Metadata type definition|Particles|rel=added}}
 +
| ({{Type|VarInt}}, Array of Particle)
 +
| length of array, particle data (See directly above.)
 +
{{Metadata type definition|Villager Data}}
 +
| ({{Type|VarInt}}, {{Type|VarInt}}, {{Type|VarInt}})
 +
| villager type, villager profession, level (See below.)
 +
{{Metadata type definition|Optional VarInt}}
 +
| {{Type|VarInt}}
 +
| 0 for absent; 1 + actual value otherwise. Used for entity IDs.
 +
{{Metadata type definition|Pose}}
 +
| {{Type|VarInt}} {{Type|Enum}}
 +
| STANDING = 0, FALL_FLYING = 1, SLEEPING = 2, SWIMMING = 3, SPIN_ATTACK = 4, SNEAKING = 5, LONG_JUMPING = 6, DYING = 7, CROAKING = 8, USING_TONGUE = 9, SITTING = 10, ROARING = 11, SNIFFING = 12, EMERGING = 13, DIGGING = 14{{change||2=, SLIDING = 15, SHOOTING = 16, INHALING = 17}}
 +
{{Metadata type definition|Cat Variant}}
 +
| {{Type|VarInt}}
 +
| An ID in the <code>minecraft:cat_variant</code> registry.
 +
{{Metadata type definition|Wolf Variant|rel=added}}
 +
| {{Type|VarInt}}
 +
| An ID in the <code>minecraft:wolf_variant</code> registry.
 +
{{Metadata type definition|Frog Variant}}
 +
| {{Type|VarInt}}
 +
| An ID in the <code>minecraft:frog_variant</code> registry.
 +
{{Metadata type definition|Optional Global Position}}
 +
| ({{Type|Boolean}}, {{Type|Optional}} {{Type|Identifier}}, {{Type|Optional}} {{Type|Position}})
 +
| dimension identifier, position; only if the Boolean is set to true.
 +
{{Metadata type definition|Painting Variant}}
 +
| {{Type|VarInt}}
 +
| An ID in the <code>minecraft:painting_variant</code> registry.
 +
{{Metadata type definition|Sniffer State}}
 +
| {{Type|VarInt}} {{Type|Enum}}
 +
| IDLING = 0, FEELING_HAPPY = 1, SCENTING = 2, SNIFFING = 3, SEARCHING = 4, DIGGING = 5, RISING = 6
 +
{{Metadata type definition|Armadillo State|rel=added}}
 +
| {{Type|VarInt}} {{Type|Enum}}
 +
| IDLE = 0, ROLLING = 1, SCARED = 2
 +
{{Metadata type definition|Vector3}}
 +
| ({{Type|Float}}, {{Type|Float}}, {{Type|Float}})
 +
| x, y, z
 +
{{Metadata type definition|Quaternion}}
 +
| ({{Type|Float}}, {{Type|Float}}, {{Type|Float}}, {{Type|Float}})
 +
| x, y, z, w
 +
|}
  
==== Handshake ====
+
=== Living Entity ===
This causes the server to switch into the target state.
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=4 | 0x00
 
| Protocol Version || VarInt ||
 
|-
 
| Server Address (hostname or IP) || String || localhost
 
|-
 
| Server Port || Unsigned Short|| 25565
 
|-
 
| Current state || VarInt || 1 for status, 2 for login
 
|}
 
  
== Play ==
+
TODO: This has changed to use the PARTICLES attribute
 
 
=== Clientbound ===
 
  
==== Keep Alive ====
+
=== Wolf ===
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=1 | 0x00
 
| Keep Alive ID || Int ||
 
|}
 
  
 +
{{Metadata inherit|Wolf|inherits=Tameable Animal}}
  
==== Join Game ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Index
|-
+
! Type
| rowspan=5 | 0x01
+
!style="width: 250px;" colspan="2"| Meaning
| Entity ID || Int || The player's Entity ID
+
! Default
|-
+
|- {{added}}
| Gamemode || Unsigned Byte || 0: survival, 1: creative, 2: adventure. Bit 3 (0x8) is the hardcore flag
+
| {{Metadata id|}}
|-
+
| {{Metadata type|Wolf Variant}}
| Dimension || Byte || -1: nether, 0: overworld, 1: end
+
|colspan="2"| Wolf Variant
|-
+
| PALE
| Difficulty || Unsigned Byte || 0 thru 3 for Peaceful, Easy, Normal, Hard
+
|-
|-
+
| {{Metadata id|}}
| Max Players || Unsigned Byte || Used by the client to draw the player list
+
| {{Metadata type|Boolean}}
|}
+
|colspan="2"| Is begging
 +
| false
 +
|-
 +
| {{Metadata id|}}
 +
| {{Metadata type|VarInt}}
 +
|colspan="2"| Collar color (values are those {{Minecraft Wiki|Data_values#Dyes|used with dyes}})
 +
| 14 (Red)
 +
|-
 +
| {{Metadata id|}}
 +
| {{Metadata type|VarInt}}
 +
|colspan="2"| Anger time
 +
| 0
 +
|}
  
==== Chat Message ====
+
=== Armadillo ===
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=1 | 0x02
 
| JSON Data || String || https://gist.github.com/thinkofdeath/e882ce057ed83bac0a1c
 
|}
 
  
==== Time Update ====
+
{{Metadata inherit|Armadillo|inherits=Animal|start_at=17}}
{| class="wikitable"
+
{| class="wikitable" {{added}}
! Packet ID !! Field Name !! Field Type !! Notes
+
! Index
|-
+
! Type
| rowspan=2 | 0x03
+
!style="width: 250px;" colspan="2"| Meaning
| Age of the world || Long || In ticks; not changed by server commands
+
! Default
|-
+
|-
| Time of day || Long || The world (or region) time, in ticks. If negative the sun will stop moving at the Math.abs of the time
+
| {{Metadata id|added}}
|}
+
| {{Metadata type|Armadillo State}}
 +
|colspan="2"| Armadillo State
 +
| IDLE
 +
|}
  
==== Entity Equipment ====
+
== Block Actions ==
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=3 | 0x04
 
| EntityID || Int || Entity's ID
 
|-
 
| Slot || Short || Equipment slot: 0=held, 1-4=armor slot (1 - boots, 2 - leggings, 3 - chestplate, 4 - helmet)
 
|-
 
| Item || [[Slot_Data|Slot]] || Item in slot format
 
|}
 
  
==== Spawn Position ====
+
No changes so far.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=3 | 0x05
 
| X || Int || Spawn X in block coordinates
 
|-
 
| Y || Int || Spawn Y in block coordinates
 
|-
 
| Z || Int || Spawn | in block coordinates
 
|}
 
  
==== Update Health ====
+
== Inventories ==
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=3 | 0x06
 
| Health || Float || 0 or less = dead, 20 = full HP
 
|-
 
| Food || Short || 0 - 20
 
|-
 
| Food Saturation || Float || Seems to vary from 0.0 to 5.0 in integer increments
 
|}
 
  
==== Respawn ====
+
No changes so far.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=3 | 0x07
 
| Dimension || Int || -1: The Nether, 0: The Overworld, 1: The End
 
|-
 
| Difficulty || Unsigned Byte || 0 thru 3 for Peaceful, Easy, Normal, Hard.
 
|-
 
| Gamemode || Unsigned Byte || 0: survival, 1: creative, 2: adventure. The hardcore flag is not included
 
|}
 
  
==== Player Position And Look ====
+
== Plugin Channels ==
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=6| 0x08
 
| X || Double || Absolute position
 
|-
 
| Y || Double || Absolute position
 
|-
 
| Z || Double || Absolute position
 
|-
 
| Yaw || Float || Absolute rotation on the X Axis, in degrees
 
|-
 
| Pitch || Float || Absolute rotation on the Y Axis, in degrees
 
|-
 
| On Ground || Bool || True if the client is on the ground, False otherwise
 
|}
 
  
==== Held Item Change ====
+
No changes so far.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=1 | 0x09
 
| Slot || Byte || The slot which the player has selected (0-8)
 
|}
 
  
==== Use Bed ====
+
== Handshake ==
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=5 | 0x0A
 
| Entity ID || Int || Player ID
 
|-
 
| X || Int || Bed headboard X as block coordinate
 
|-
 
| Y || Unsigned Byte || Bed headboard Y as block coordinate
 
|-
 
| Z || Int || Bed headboard Z as block coordinate
 
|}
 
  
==== Animation ====
+
=== Serverbound ===
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=2 | 0x0B
 
| Entity ID || Int || Player ID
 
|-
 
| Animation || Unsigned Byte || Animation ID
 
|}
 
  
Animation can be one of the following values:
+
==== Handshake ====
  
{| class="wikitable"
+
This causes the server to switch into the target state.
! ID !! Animation
 
|-
 
| 0 || No animation
 
|-
 
| 1 || Swing arm
 
|-
 
| 2 || Damage animation
 
|-
 
| 3 || Leave bed
 
|-
 
| 5 || Eat food
 
|-
 
| 6 || Critical effect
 
|-
 
| 7 || Magic critical effect
 
|-
 
| 102 || (unknown)
 
|-
 
| 104 || Crouch
 
|-
 
| 105 || Uncrouch
 
|}
 
  
==== Spawn Player ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan=10 | 0x0C
+
! Bound To
| Entity ID || VarInt || Player's Entity ID
+
! Field Name
|-
+
! Field Type
| Player UUID || String || Player's UUID
+
! Notes
|-
+
|-
| Player Name || String || Player's Name
+
| rowspan="4"| 0x00
|-
+
| rowspan="4"| Handshaking
| X || Int || Player X as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]  
+
| rowspan="4"| Server
|-
+
| Protocol Version
| Y || Int || Player X as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]  
+
| [[#Definitions:varint|VarInt]]
|-
+
| See [[protocol version numbers]] (currently 765 in Minecraft 1.20.4).
| Z || Int || Player X as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]  
+
|-
|-
+
| Server Address
| Yaw || Byte || Player rotation as a packed byte
+
| [[#Definitions:string|String]] (255)
|-
+
| 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 simple redirect, e.g. if _minecraft._tcp.example.com points to mc.example.org, users connecting to example.com will provide example.org as server address in addition to connecting to it.
| Pitch || Byte || Player rotation as a packet byte
+
|-
|-
+
| Server Port
| Current Item || Short || The item the player is currently holding. Note that this should be 0 for "no item", unlike -1 used in other packets. A negative value crashes clients.
+
| [[#Definitions:unsigned-short|Unsigned Short]]
|-
+
| Default is 25565. The Notchian server does not use this information.
| Metadata || [[Entities#Entity_Metadata_Format|Metadata]] || The client will crash if no metadata is sent
+
|-
|}
+
| Next State
 +
| [[#Definitions:varint|VarInt]] [[#Definitions:enum|Enum]]
 +
| 1 for [[#Status|Status]], 2 for [[#Login|Login]]{{change||, 3 for [[#Login|Transfer]]}}.
 +
|}
  
==== Collect Item ====
+
== Status ==
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=2 | 0x0D
 
| Collected Entity ID || Int ||
 
|-
 
| Collector Entity ID || Int ||
 
|}
 
  
==== Spawn Object ====
+
=== Clientbound ===
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=8| 0x0E
 
| Entity ID || VarInt || Entity ID of the object
 
|-
 
| Type || Byte || The of object (See [[Entities#Objects|Objects]]
 
|-
 
| X || Int || X position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| Y || Int || Y position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| Z || Int || Z position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| Pitch || Byte || The pitch in steps of 2p/256
 
|-
 
| Yaw || Byte || The yaw in steps of 2p/256
 
|-
 
| Data || [[Object_Data|Object Data]] ||
 
|}
 
  
==== Spawn Mob ====
+
No changes so far.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=12 | 0x0F
 
| Entity ID || VarInt || Entity's ID
 
|-
 
| Type || Unsigned Byte || The type of mob. See [[Entities#Mobs|Mobs]]
 
|-
 
| X || Int || X position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| Y || Int || Y position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| Z || Int || Z position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| Pitch || Byte || The pitch in steps of 2p/256
 
|-
 
| Head Pitch || Byte || The pitch in steps of 2p/256
 
|-
 
| Yaw || Byte || The yaw in steps of 2p/256
 
|-
 
| Velocity X || Short ||
 
|-
 
| Velocity Y || Short ||
 
|-
 
| Velocity Z || Short ||
 
|-
 
| Metadata || [[Entities#Entity_Metadata_Format|Metadata]] ||
 
|}
 
  
==== Spawn Painting ====
+
=== Serverbound ===
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=6 | 0x10
 
| Entity ID || VarInt || Entity's ID
 
|-
 
| Title || String || Name of the painting. Max length 13
 
|-
 
| X || Int || Center X coordinate
 
|-
 
| Y || Int || Center Y coordinate
 
|-
 
| Z || Int || Center Z coordinate
 
|-
 
| Direction || Int || Direction the painting faces (0 -z, 1 -x, 2 +z, 3 +x)
 
|}
 
  
==== Spawn Experience Orb ====
+
No changes so far.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=5 | 0x11
 
| Entity ID || VarInt || Entity's ID
 
|-
 
| X || Int || X position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| Y || Int || Y position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| Z || Int || Z position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| Count || Short || The amount of experience this orb will reward once collected
 
|}
 
  
==== Entity Velocity ====
+
== Login ==
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=4 | 0x12
 
| Entity ID || Int || Entity's ID
 
|-
 
| Velocity X || Short || Velocity on the X axis
 
|-
 
| Velocity Y || Short || Velocity on the Y axis
 
|-
 
| Velocity Z || Short || Velocity on the Z axis
 
|}
 
  
==== Destroy Entities====
+
=== Clientbound ===
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=2 | 0x13
 
| Count || Byte || Length of following array
 
|-
 
| Entity IDs || Array of Int || The list of entities of destroy
 
|}
 
  
==== Entity ====
+
==== Encryption Request ====
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=1 | 0x14
 
| Entity ID || Int || Entity's ID
 
|}
 
  
==== Entity Relative Move ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan=4| 0x15
+
! Bound To
| Entity ID || Int || Entity's ID
+
! Field Name
|-
+
! Field Type
| DX || Byte || Change in X position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
+
! Notes
|-
+
|-
| DY || Byte || Change in Y position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
+
| rowspan="6"| 0x01
|-
+
| rowspan="6"| Login
| DZ || Byte || Change in Z position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
+
| rowspan="6"| Client
|}
+
| Server ID
 +
| {{Type|String}} (20)
 +
| Appears to be empty.
 +
|-
 +
| Public Key Length
 +
| {{Type|VarInt}}
 +
| Length of Public Key.
 +
|-
 +
| Public Key
 +
| {{Type|Byte Array}}
 +
| The server's public key, in bytes.
 +
|-
 +
| Verify Token Length
 +
| {{Type|VarInt}}
 +
| Length of Verify Token. Always 4 for Notchian servers.
 +
|-
 +
| Verify Token
 +
| {{Type|Byte Array}}
 +
| A sequence of random bytes generated by the server.
 +
|- {{added}}
 +
| Should Authenticate
 +
| {{Type|Boolean}}
 +
|  
 +
|}
  
==== Entity Look ====
+
==== Cookie Request (login) ====
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=3 | 0x16
 
| Entity ID || Int || Entity's ID
 
|-
 
| Yaw || Byte || The X Axis rotation as a fraction of 360
 
|-
 
| Pitch || Byte || The Y Axis rotation as a fraction of 360
 
|}
 
  
==== Entity Look and Relative Move ====
+
Requests a cookie that was previously stored.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=6 | 0x17
 
| Entity ID || Int || Entity's ID
 
|-
 
| DX || Byte || Change in X position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| DY || Byte || Change in Y position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| DZ || Byte || Change in Z position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
 
|-
 
| Yaw || Byte || The X Axis rotation as a fraction of 360
 
|-
 
| Pitch || Byte || The Y Axis rotation as a fraction of 360
 
|}
 
  
==== Entity Teleport ====
+
{| class="wikitable" {{added}}
{| class="wikitable"
+
! Packet ID
! Packet ID !! Field Name !! Field Type !! Notes
+
! State
|-
+
! Bound To
| rowspan=6 | 0x18
+
! colspan="2"| Field Name
| Entity ID || Int || Entity's ID
+
! colspan="2"| Field Type
|-
+
! Notes
| X || Int || X position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
+
|-
|-
+
| rowspan="1"| 0x05
| Y || Int || Y position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
+
| rowspan="1"| Login
|-
+
| rowspan="1"| Client
| Z || Int || Z position as a [[Data_Types#Fixed-point_numbers|Fixed-Point number]]
+
| colspan="2"| Key
|-
+
| colspan="2"| Identifier
| Yaw || Byte || The X Axis rotation as a fraction of 360
+
| The identifier of the cookie.
|-
+
|}
| Pitch || Byte || The Y Axis rotation as a fraction of 360
 
|}
 
  
==== Entity Head Look ====
+
=== Serverbound ===
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=2 | 0x19
 
| Entity ID || Int || Entity's ID
 
|-
 
| Head Yaw || Byte || Head yaw in steps of 2p/256
 
|}
 
  
==== Entity Status ====
+
==== Cookie Response (login) ====
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=2 | 0x1A
 
| Entity ID || Int || Entity's ID
 
|-
 
| Entity Status || Byte || See below
 
|}
 
  
{| class="wikitable"
+
Response to a [[#Cookie_Request_(login)|Cookie Request (login)]] from the server. The Notchian server only accepts responses of up to 5 kiB in size.
|-
 
! Entity Status !! Meaning
 
|-
 
| 2 || Entity hurt
 
|-
 
| 3 || Entity dead
 
|-
 
| 6 || Wolf taming
 
|-
 
| 7 || Wolf tamed
 
|-
 
| 8 || Wolf shaking water off itself
 
|-
 
| 9 || (of self) Eating accepted by server
 
|-
 
| 10 || Sheep eating grass
 
|-
 
| 11 || Iron Golem handing over a rose
 
|-
 
| 12 || Spawn "heart" particles near a villager
 
|-
 
| 13 || Spawn particles indicating that a villager is angry and seeking revenge
 
|-
 
| 14 || Spawn happy particles near a villager
 
|-
 
| 15 || Spawn a "magic" particle near the Witch
 
|-
 
| 16 || Zombie converting into a villager by shaking violently (unused in recent update)
 
|-
 
| 17 || A firework exploding
 
|}
 
  
==== Attach Entity ====
+
{| class="wikitable" {{added}}
{| class="wikitable"
+
! Packet ID
! Packet ID !! Field Name !! Field Type !! Notes
+
! State
|-
+
! Bound To
| rowspan=3 | 0x1B
+
! colspan="2"| Field Name
| Entity ID || Int || Entity's ID
+
! colspan="2"| Field Type
|-
+
! Notes
| Vehicle ID || Int || Vechicle's Entity ID
+
|-
|-
+
| rowspan="4"| 0x04
| Leash || Bool || If true leashes the entity to the vehicle
+
| rowspan="4"| Login
|}
+
| rowspan="4"| Server
 +
| colspan="2"| Key
 +
| colspan="2"| Identifier
 +
| The identifier of the cookie.
 +
|-
 +
| colspan="2"| Has Payload
 +
| colspan="2"| Boolean
 +
| The payload is only present if the cookie exists on the client.
 +
|-
 +
| colspan="2"| Payload Length
 +
| colspan="2"| VarInt
 +
| Length of the following byte array.
 +
|-
 +
| colspan="2"| Payload
 +
| colspan="2"| Optional Byte Array (5120)
 +
| The data of the cookie, if any.
 +
|}
  
==== Entity Metadata ====
+
== Configuration ==
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=2 | 0x1C
 
| Entity ID || Int || Entity's ID
 
|-
 
| Metadata || [[Entities#Entity_Metadata_Format|Metadata]] ||
 
|}
 
  
==== Entity Effect ====
+
=== Clientbound ===
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=4 | 0x1D
 
| Entity ID || Int || Entity's ID
 
|-
 
| Effect ID || Byte || See [[http://www.minecraftwiki.net/wiki/Potion_effect#Parameters]]
 
|-
 
| Amplifier || Byte ||
 
|-
 
| Duration || Short ||
 
|}
 
  
==== Remove Entity Effect ====
+
==== Cookie Request (configuration) ====
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=2 | 0x1E
 
| Entity ID || Int || Entity's ID
 
|-
 
| Effect ID || Byte ||
 
|}
 
  
==== Set Experience ====
+
Requests a cookie that was previously stored.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=3 | 0x1F
 
| Experience bar || Float || Between 0 and 1
 
|-
 
| Level || Short ||
 
|-
 
| Total Experience || Short ||
 
|}
 
  
==== Entity Properties ====
+
{| class="wikitable" {{added}}
{| class="wikitable"
+
! Packet ID
! Packet ID !! Field Name !! Field Type !! Notes
+
! State
|-
+
! Bound To
| rowspan=3 | 0x20
+
! colspan="2"| Field Name
| Entity ID || Int | Entity's ID
+
! colspan="2"| Field Type
|-
+
! Notes
| Count || Int || Length of following array
+
|-
|-
+
| rowspan="1"| 0x00
| Properties || Array of Property Data ||
+
| rowspan="1"| Configuration
|}
+
| rowspan="1"| Client
 +
| colspan="2"| Key
 +
| colspan="2"| Identifier
 +
| The identifier of the cookie.
 +
|}
  
'''Property Data''' structure:
+
==== Reset Chat ====
{| class="wikitable"
 
|-
 
! Field Name !! Field Type !! Notes
 
|-
 
| Key || String ||
 
|-
 
| Value || Double ||
 
|-
 
| List Length || Short || Number of list elements that follow.
 
|-
 
| Modifiers || Array of Modifier Data || http://www.minecraftwiki.net/wiki/Attribute#Modifiers
 
|}
 
  
Known key values:
+
{| class="wikitable" {{added}}
{| class="wikitable"
+
! Packet ID
|-
+
! State
! Key !! Default !! Min !! Max !! Label
+
! Bound To
|-
+
! Field Name
| generic.maxHealth || 20.0 || 0.0 || Double.MaxValue || Max Health
+
! Field Type
|-
+
! Notes
| generic.followRange || 32.0 || 0.0 || 2048.0 || Follow Range
+
|-
|-
+
| 0x06
| generic.knockbackResistance || 0.0 || 0.0 || 1.0 || Knockback Resistance
+
| Configuration
|-
+
| Client
| generic.movementSpeed || 0.699999988079071 || 0.0 || Double.MaxValue || Movement Speed
+
| colspan="3"| ''no fields''
|-
+
|}
| generic.attackDamage || 2.0 || 0.0 || Double.MaxValue ||
 
|-
 
| horse.jumpStrength || 0.7 || 0.0 || 2.0 || Jump Strength
 
|-
 
| zombie.spawnReinforcements || 0.0 || 0.0 || 1.0 || Spawn Reinforcements Chance
 
|}
 
  
'''Modifier Data''' structure:
+
==== Registry Data ====
{| class="wikitable"
 
|-
 
! Field Name !! Field Type !! Notes
 
|-
 
| UUID || 128-bit integer ||
 
|-
 
| Amount || Double ||
 
|-
 
| Operation || Byte ||
 
|}
 
  
==== Chunk Data ====
+
Represents certain registries that are sent from the server and are applied on the client. {{change||The packet is sent for each of the following registries: <code>minecraft:worldgen/biome</code>, <code>minecraft:chat_type</code>, <code>minecraft:trim_pattern</code>, <code>minecraft:trim_material</code>, <code>minecraft:wolf_variant</code>, <code>minecraft:dimension_type</code>, <code>minecraft:damage_type</code>, and <code>minecraft:banner_pattern</code>.}}
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=7 | 0x21
 
| Chunk X || Int || Chunk X coordinate
 
|-
 
| Chunk Z || Int || Chunk Z coordinate
 
|-
 
| Ground-Up continuous || Boolean || This is True if the packet represents all sections in this vertical column, where the primary bit map specifies exactly which sections are included, and which are air
 
|-
 
| Primary bit map || Unsigned Short || Bitmask with 1 for every 16x16x16 section which data follows in the compressed data.
 
|-
 
| Add bit map || Unsigned Short || Same as above, but this is used exclusively for the 'add' portion of the payload
 
|-
 
| Compressed size || Int || Size of compressed chunk data
 
|-
 
| Compressed data || Byte array || The chunk data is compressed using Zlib Deflate
 
|}
 
  
==== Multi Block Change ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan=5 | 0x22
+
! Bound To
| Chunk X || VarInt || Chunk X coordinate
+
! colspan="2"| Field Name
|-
+
! colspan="2"| Field Type
| Chunk Z || VarInt || Chunk Z Coordinate
+
! Notes
|-
+
|-
| Record count || Short || The number of blocks affected
+
| rowspan="6"| 0x07
|-
+
| rowspan="6"| Configuration
| Data size || Int ||  The total size of the data, in bytes. Should always be 4*record count
+
| rowspan="6"| Client
|-
+
|{{removed}} colspan="2"| Registry Codec
| Records || Array of Records ||  
+
|{{removed}} colspan="2"| {{Type|NBT}} (Compound)
|}
+
|{{removed}}| See [[Registry Data]].
 +
|- {{added}}
 +
| colspan="2"| Registry ID
 +
| colspan="2"| Identifier
 +
|  
 +
|- {{added}}
 +
| colspan="2"| Entry Count
 +
| colspan="2"| VarInt
 +
| Number of entries in the following array.
 +
|- {{added}}
 +
| rowspan="3"| Entries
 +
| Entry ID
 +
| rowspan="3"| Array
 +
| Identifier
 +
|
 +
|- {{added}}
 +
| Has Data
 +
| Boolean
 +
  | Whether the entry has any data following.
 +
|- {{added}}
 +
| Data
 +
| NBT Tag
 +
| Entry data. Only present if Has Data is true.
 +
|}
  
'''Record'''
+
==== Store Cookie (configuration) ====
{| class="wikitable"
 
|-
 
! Bit mask !! Width !! Meaning
 
|-
 
| 00 00 00 0F || 4 bits || Block metadata
 
|-
 
| 00 00 FF F0 || 12 bits || Block ID
 
|-
 
| 00 FF 00 00 || 8 bits || Y co-ordinate
 
|-
 
| 0F 00 00 00 || 4 bits || Z co-ordinate, relative to chunk
 
|-
 
| F0 00 00 00 || 4 bits || X co-ordinate, relative to chunk
 
|}
 
  
==== Block Change ====
+
Stores some arbitrary data on the client, which persists between server transfers. The Notchian client only accepts cookies of up to 5 kiB in size.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=5 | 0x23
 
| X || Int || Block X Coordinate
 
|-
 
| Y || Unsigned Byte || Block Y Coordinate
 
|-
 
| Z || Int || Block Z Coordinate
 
|-
 
| Block Type || VarInt || The new block type for the block
 
|-
 
| Block Data || Unsigned Byte || The new data for the block
 
|}
 
  
==== Block Action ====
+
{| class="wikitable" {{added}}
{| class="wikitable"
+
! Packet ID
! Packet ID !! Field Name !! Field Type !! Notes
+
! State
|-
+
! Bound To
| rowspan=6 | 0x24
+
! colspan="2"| Field Name
| X || Int || Block X Coordinate
+
! colspan="2"| Field Type
|-
+
! Notes
| Y || Short || Block Y Coordinate
+
|-
|-
+
| rowspan="2"| 0x0A
| Z || Int || Block Z Coordinate
+
| rowspan="2"| Configuration
|-
+
| rowspan="2"| Client
| Byte 1 || Unsigned Byte || Varies depending on block - see [[Block_Actions]]
+
| colspan="2"| Key
|-
+
| colspan="2"| Identifier
| Byte 2 || Unsigned Byte || Varies depending on block - see [[Block_Actions]]
+
| The identifier of the cookie.
|-
+
|-
| Block Type || VarInt || The block type for the block
+
| colspan="2"| Payload
|}
+
| colspan="2"| ByteArray(5120)
 +
| The data of the cookie.
 +
|}
  
==== Block Break Animation ====
+
==== Transfer (configuration) ====
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=5 | 0x25
 
| Entity ID || VarInt || Entity's ID
 
|-
 
| X || Int || rowspan=3 | Block Position
 
|-
 
| Y || Int
 
|-
 
| Z || Int
 
|-
 
| Destroy Stage || Byte || 0 - 9
 
|}
 
  
==== Map Chunk Bulk ====
+
Notifies the client that it should transfer to the given server. Cookies previously stored are preserved between server transfers.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=5 | 0x26
 
| Chunk column count || Short || The number of chunk in this packet
 
|-
 
| Data length || Int || The size of the data field
 
|-
 
| Sky light sent || Bool || Whether or not the chunk data contains a light nibble array. This is true in the main world, false in the end + nether
 
|-
 
| Data || Byte Array || Compressed chunk data
 
|-
 
| Meta information || Meta || See below
 
|}
 
  
'''Meta'''
+
{| class="wikitable" {{added}}
{| class="wikitable"
+
! Packet ID
! Field Name !! Field Type !! Notes
+
! State
|-
+
! Bound To
|Chunk X || Int || The X Coordinate of the chunk
+
! colspan="2"| Field Name
|-
+
! colspan="2"| Field Type
|Chunk Z || Int || The Z Coordinate of the chunk
+
! Notes
|-
+
|-
|Primary bitmap || Unsigned Short || A bitmap which specifies which sections are not empty in this chunk
+
| rowspan="2"| 0x0B
|-
+
| rowspan="2"| Configuration
|Add bitmap || Unsigned Short || A bitmap which specifies which sections need add information because of very high block ids. not yet used
+
| rowspan="2"| Client
|}
+
| colspan="2"| Host
 
+
| colspan="2"| String
==== Explosion ====
+
| The hostname of IP of the server.
{| class="wikitable"
+
|-
! Packet ID !! Field Name !! Field Type !! Notes
+
| colspan="2"| Port
|-
+
| colspan="2"| VarInt
| rowspan="9" | 0x27
+
| The port of the server.
| X || Float ||
+
|}
|-
 
| Y || Float ||
 
|-
 
| Z || Float ||
 
|-
 
| Radius || Float || Currently unused in the client
 
|-
 
| Record count || Int || This is the count, not the size. The size is 3 times this value.
 
|-
 
| Records || (Byte, Byte, Byte) × count || Each record is 3 signed bytes long, each bytes are the XYZ (respectively) offsets of affected blocks.
 
|-
 
| Player Motion X || Float || X velocity of the player being pushed by the explosion
 
|-
 
| Player Motion Y || Float || Y velocity of the player being pushed by the explosion
 
|-
 
| Player Motion Z || Float || Z velocity of the player being pushed by the explosion
 
|}
 
 
 
==== Effect ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="6" | 0x28
 
| Effect ID || Int || The ID of the effect, see below.
 
|-
 
| X || Int || The X location of the effect multiplied by 8
 
|-
 
| Y || Byte || The Y location of the effect multiplied by 8
 
|-
 
| Z || Int || The Z location of the effect multiplied by 8
 
|-
 
| Data || Int || Extra data for certain effects, see below.
 
|-
 
| Disable relative volume || Bool || See above
 
|}
 
 
 
'''Sound''':
 
 
 
*1000: <code>random.click</code>
 
*1001: <code>random.click</code>
 
*1002: <code>random.bow</code>
 
*1003: <code>random.door_open</code> or <code>random.door_close</code> (50/50 chance)
 
*1004: <code>random.fizz</code>
 
*1005: Play a music disc. '''Data''': [http://www.minecraftwiki.net/wiki/Music_Discs Record ID]
 
*''(1006 not assigned)''
 
*1007: <code>mob.ghast.charge</code>
 
*1008: <code>mob.ghast.fireball</code>
 
*1009: <code>mob.ghast.fireball</code>, but with a lower volume.
 
*1010: <code>mob.zombie.wood</code>
 
*1011: <code>mob.zombie.metal</code>
 
*1012: <code>mob.zombie.woodbreak</code>
 
*1013: <code>mob.wither.spawn</code>
 
*1014: <code>mob.wither.shoot</code>
 
*1015: <code>mob.bat.takeoff</code>
 
*1016: <code>mob.zombie.infect</code>
 
*1017: <code>mob.zombie.unfect</code>
 
*1018: <code>mob.enderdragon.end</code>
 
*1020: <code>random.anvil_break</code>
 
*1021: <code>random.anvil_use</code>
 
*1022: <code>random.anvil_land</code>
 
 
 
'''Particle''':
 
 
 
*2000: Spawns 10 smoke particles, e.g. from a fire. '''Data''': direction, see below
 
*2001: Block break. '''Data''': [http://www.minecraftwiki.net/wiki/Data_values Block ID]
 
*2002: Splash potion. Particle effect + glass break sound. '''Data''': [http://www.lb-stuff.com/Minecraft/PotionDataValues1.9pre3.txt Potion ID]
 
*2003: Eye of ender entity break animation - particles and sound
 
*2004: Mob spawn particle effect: smoke + flames
 
*2005: Spawn "happy villager" effect (hearts).
 
 
 
Smoke directions:
 
  
{| class="wikitable"
+
==== Clientbound Known Packs ====
! ID !! Direction
+
Informs the client of which data packs are present on the server.
|-
+
The client is expected to respond with its own [[#Serverbound_Known_Packs|Serverbown Known Packs]] packet.
| 0 || South - East
+
The Notchian server does not continue with Configuration until it receives a response.
|-
 
| 1 || South
 
|-
 
| 2 || South - West
 
|-
 
| 3 || East
 
|-
 
| 4 || (Up or middle ?)
 
|-
 
| 5 || West
 
|-
 
| 6 || North - East
 
|-
 
| 7 || North
 
|-
 
| 8 || North - West
 
|}
 
  
==== Sound Effect ====
+
{| class="wikitable" {{added}}
 
+
! Packet ID
{| class="wikitable"
+
! State
! Packet ID !! Field Name !! Field Type !! Notes
+
  ! Bound To
|-
+
  ! colspan="2"| Field Name
| rowspan="7" | 0x29
+
! colspan="2"| Field Type
| Sound name || String ||
+
! Notes
|-
+
|-
| Effect position X || Int || Effect X multiplied by 8
+
| rowspan="4"| 0x0E
|-
+
| rowspan="4"| Configuration
| Effect position Y || Int || Effect Y multiplied by 8
+
| rowspan="4"| Client
|-
+
| colspan="2"| Known Pack Count
| Effect position Z || Int || Effect Z multiplied by 8
+
| colspan="2"| VarInt
|-
+
| The number of known packs in the following array.
| Volume || Float || 1 is 100%, can be more
+
|-
|-
+
| rowspan="3"| Known Packs
| Pitch || Unsigned Byte || 63 is 100%, can be more
+
| Namespace
|-
+
| rowspan="3"| Array
| Sound Category || Unsigned Byte || Possible values:
+
| String
MASTER: 0
+
|
 
+
|-
MUSIC: 1
+
| ID
 
+
| String
RECORDS: 2
+
|
 
+
|-
WEATHER: 3
+
| Version
 
+
| String
BLOCKS: 4
+
|
 
+
|}
MOBS: 5
 
 
 
ANIMALS: 6
 
 
 
PLAYERS: 7
 
|}
 
 
 
==== Particle ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="9" | 0x2A
 
| Particle name || String || The name of the particle to create. A list can be found [https://gist.github.com/thinkofdeath/5110835 here]
 
|-
 
| 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 speed || Float || The speed of each particle
 
|-
 
| Number of particles || Int || The number of particles to create
 
|}
 
 
 
==== Change Game State ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="2" | 0x2B
 
| Reason || Unsigned Byte ||
 
|-
 
| Value || Float || Depends on reason
 
|}
 
 
 
'''Reason codes'''
 
 
 
{| class="wikitable"
 
! Code !! Effect !! Notes
 
|-
 
| 0 || Invalid Bed || "tile.bed.notValid"
 
|-
 
| 1 || Begin raining ||
 
|-
 
| 2 || End raining ||
 
|-
 
| 3 || Change game mode || "gameMode.changed" 0 - Survival, 1 - Creative, 2 - Adventure
 
|-
 
| 4 || Enter credits ||
 
|-
 
| 5 || Demo messages || 0 - Show welcome to demo screen, 101 - Tell movement controls, 102 - Tell jump control, 103 - Tell inventory control
 
|-
 
| 6 | Bow hit sound ||
 
|-
 
| 7 || Fade value || The current darkness value. 1 = Dark, 0 = Bright, Setting the value higher causes the game to change color and freeze
 
|-
 
| 8 || Fade time || Time in ticks for the sky to fade
 
|}
 
 
 
==== Spawn Global Entity ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="5" | 0x2C
 
| Entity ID || VarInt || The entity ID of the thunderbolt
 
|-
 
| Type || Byte || The global entity type, currently always 1 for thunderbolt.
 
|-
 
| X || Int || Thunderbolt X a [[Data_Types#Fixed-point_numbers|fixed-point number]]
 
|-
 
| Y || Int || Thunderbolt Y a [[Data_Types#Fixed-point_numbers|fixed-point number]]
 
|-
 
| Z || Int || Thunderbolt Z a [[Data_Types#Fixed-point_numbers|fixed-point number]]
 
|}
 
 
 
==== Open Window ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="6" | 0x2D
 
| Window id || Unsigned Byte || A unique id number for the window to be displayed. Notchian server implementation is a counter, starting at 1.
 
|-
 
| Inventory Type || Unsigned Byte || The window type to use for display. Check below
 
|-
 
| Window title || String || The title of the window.
 
|-
 
| Number of Slots || Unsigned Byte || Number of slots in the window (excluding the number of slots in the player inventory).
 
|-
 
| Use provided window title || Bool || If false, the client will look up a string like "window.minecart". If true, the client uses what the server provides.
 
|-
 
| Entity ID || Int || EntityHorse's entityId. Only sent when window type is equal to 11 (AnimalChest).
 
|}
 
 
 
See [[Inventory#Windows|inventory windows]] for further information.
 
 
 
==== Close Window ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| 0x2E
 
| Window ID || Unsigned Byte || This is the id of the window that was closed. 0 for inventory.
 
|}
 
 
 
==== Set Slot ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="3" | 0x2F
 
| Window ID || Unsigned Byte
 
| The window which is being updated. 0 for player inventory. Note that all known window types include the player inventory. This packet will only be sent for the currently opened window while the player is performing actions, even if it affects the player inventory. After the window is closed, a number of these packets are sent to update the player's inventory window (0).
 
|-
 
| Slot || Short || The slot that should be updated
 
|-
 
| Slot data || [[Slot_Data|Slot]] ||
 
|}
 
 
 
==== Window Items ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="3" | 0x30
 
| Window ID || Unsigned Byte || The id of window which items are being sent for. 0 for player inventory.
 
|-
 
| Count || Short || The number of slots (see below)
 
|-
 
| Slot data || Array of [[Slot_Data|Slot]]s ||
 
|}
 
 
 
See [[Inventory#Windows|inventory windows]] for further information about how slots are indexed.
 
 
 
==== Window Property ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="3" | 0x31
 
| Window ID || Unsigned Byte || The id of the window.
 
|-
 
| Property || Short || Which property should be updated.
 
|-
 
| Value || Short || The new value for the property.
 
|}
 
 
 
'''Furnace'''
 
 
 
Properties:
 
 
 
* 0: Progress arrow
 
* 1: Fire icon (fuel)
 
 
 
Values:
 
 
 
* 0-200 for progress arrow
 
* 0-200 for fuel indicator
 
 
 
Ranges are presumably in in-game ticks
 
 
 
'''Enchantment Table'''
 
 
 
Properties: 0, 1 or 2 depending on the "enchantment slot" being given.
 
 
 
Values: The enchantment's level.
 
 
 
==== Confirm Transaction  ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="3" | 0x32
 
| Window ID || Unsigned Byte || The id of the window that the action occurred in.
 
|-
 
| Action number || Short || Every action that is to be accepted has a unique number. This field corresponds to that number.
 
|-
 
| Accepted || Bool || Whether the action was accepted.
 
|}
 
 
 
==== Update Sign ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="7" | 0x33
 
| X || Int || Block X Coordinate
 
|-
 
| Y || Short || Block Y Coordinate
 
|-
 
| Z || Int || Block Z Coordinate
 
|-
 
| Line 1 || String || First line of text in the sign
 
|-
 
| Line 2 || String || Second line of text in the sign
 
|-
 
| Line 3 || String || Third line of text in the sign
 
|-
 
| Line 4 || String || Fourth line of text in the sign
 
|}
 
 
 
==== Maps ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="4" | 0x34
 
| Item Damage || VarInt || The damage value of the map being modified
 
|-
 
| Length || Short || Length of following byte array
 
|-
 
| Data || Byte Array || Array data
 
|}
 
 
 
If the first byte of the array is 0, the next two bytes are X start and Y start and the rest of the bytes are the colors in that column.
 
 
 
If the first byte of the array is 1, the rest of the bytes are in groups of three: (data, x, y). The lower half of the data is the type (always 0 under vanilla) and the upper half is the direction.
 
 
 
If the first byte of the array is 2, the second byte is the map scale.
 
 
 
==== Update Block Entity ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="6" | 0x35
 
| X || Int ||
 
|-
 
| Y || Short ||
 
|-
 
| Z || Int ||
 
|-
 
| Action || Unsigned Byte || The type of update to perform
 
|-
 
| Data length || Short || Varies
 
|-
 
| NBT Data || Byte Array || Present if data length > 0. Compressed with [[wikipedia:Gzip|gzip]]. Varies
 
|}
 
 
 
'''Actions'''
 
 
 
* '''1''': Set mob displayed inside a mob spawner. Custom 1 contains the [[Entities#Mobs|mob type]]
 
 
 
==== Sign Editor Open ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="3" | 0x36
 
| X || Int || X in block coordinates
 
|-
 
| Y || Int || Y in block coordinates
 
|-
 
| Z || Int || Z in block coordinates
 
|}
 
 
 
==== Statistics ====
 
{| class="wikitable"
 
! Packet ID
 
! colspan="2" | Field Name
 
! Field Type !! Notes
 
|-
 
| rowspan="3" | 0x37
 
| colspan="2" | Count || VarInt || Number of entrys
 
|-
 
| rowspan=2 | Entry
 
| Statistic's name || String ||
 
|-
 
| Amount || VarInt || The amount to increase by
 
|}
 
 
 
==== Player List Item ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="3" | 0x38
 
| Player name || String || Supports chat colouring, limited to 16 characters.
 
|-
 
| Online || Bool || The client will remove the user from the list if false.
 
|-
 
| Ping || Short || Ping, presumably in ms.
 
|}
 
 
 
==== Player Abilities ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="3" | 0x39
 
| Flags || Byte ||
 
|-
 
| Flying speed || Float|| previous integer value divided by 250
 
|-
 
| Walking speed || Float || previous integer value divided by 250
 
|}
 
 
 
==== Tab-Complete ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rospan=2| 0x3A
 
| Count || VarInt || Number of following strings
 
|-
 
| Match || String || Possible Tab-Complete
 
|}
 
 
 
==== Scoreboard Objective ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="3" | 0x3B
 
| Objective name || String || An unique name for the objective
 
|-
 
| Objective value || String || The text to be displayed for the score.
 
|-
 
| Create/Remove || Byte || 0 to create the scoreboard. 1 to remove the scoreboard. 2 to update the display text.
 
|}
 
 
 
==== Update Score ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="4" | 0x3C
 
| Item Name || String || An unique name to be displayed in the list.
 
|-
 
| Update/Remove || Byte || 0 to create/update an item. 1 to remove an item.
 
|-
 
| Score Name || String || The unique name for the scoreboard to be updated. Only sent when Update/Remove does not equal 1.
 
|-
 
| Value || Int || The score to be displayed next to the entry. Only sent when Update/Remove does not equal 1.
 
|}
 
 
 
==== Display Scoreboard ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="2" | 0x3D
 
| Position || Byte || The position of the scoreboard. 0 = list, 1 = sidebar, 2 = belowName.
 
|-
 
| Score Name || String || The unique name for the scoreboard to be displayed.
 
|}
 
 
 
==== Teams ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="8" | 0x3E
 
| Team Name || String || A unique name for the team. (Shared with scoreboard).
 
|-
 
| Mode || Byte || If 0 then the team is created.
 
If 1 then the team is removed.
 
 
 
If 2 the team team information is updated.
 
 
 
If 3 then new players are added to the team.
 
 
 
If 4 then players are removed from the team.
 
|-
 
| Team Display Name || String || Only if Mode = 0 or 2.
 
|-
 
| Team Prefix || String || Only if Mode = 0 or 2. Displayed before the players' name that are part of this team.
 
|-
 
| Team Suffix || String || Only if Mode = 0 or 2. Displayed after the players' name that are part of this team.
 
|-
 
| Friendly fire || Byte || Only if Mode = 0 or 2; 0 for off, 1 for on, 3 for seeing friendly invisibles
 
|-
 
| Player count || Short || Only if Mode = 0 or 3 or 4. Number of players in the array
 
|-
 
| Players || Array of strings || Only if Mode = 0 or 3 or 4. Players to be added/remove from the team.
 
|}
 
 
 
==== Plugin Message ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="3" | 0x3F
 
| Channel || String || Name of the "channel" used to send the data.
 
|-
 
| Length || Short || Length of the following byte array
 
|-
 
| Data || Byte Array || Any data.
 
|}
 
 
 
More documentation on this: http://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/
 
 
 
==== Disconnect ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| 0x40
 
| Reason || String || Displayed to the client when the connection terminates
 
|}
 
  
 
=== Serverbound ===
 
=== Serverbound ===
  
==== Keep Alive ====
+
==== Cookie Response (configuration) ====
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=1 | 0x00
 
| Keep Alive ID || Int ||
 
|}
 
 
 
==== Chat Message ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=1 | 0x01
 
| JSON Data || String || https://gist.github.com/thinkofdeath/e882ce057ed83bac0a1c
 
|}
 
  
==== Use Entity ====
+
Response to a [[#Cookie_Request_(configuration)|Cookie Request (configuration)]] from the server. The Notchian server only accepts responses of up to 5 kiB in size.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=2 | 0x02
 
| Target || Int ||
 
|-
 
| Mouse || Byte ||
 
|}
 
  
==== Player ====
+
{| class="wikitable" {{added}}
{| class="wikitable"
+
! Packet ID
! Packet ID !! Field Name !! Field Type !! Notes
+
! State
|-
+
! Bound To
| rowspan=1 | 0x03
+
! colspan="2"| Field Name
| On Ground || Bool || True if the client is on the ground, False otherwise
+
! colspan="2"| Field Type
|}
+
! Notes
 +
|-
 +
| rowspan="4"| 0x01
 +
| rowspan="4"| Configuration
 +
| rowspan="4"| Server
 +
| colspan="2"| Key
 +
| colspan="2"| Identifier
 +
| The identifier of the cookie.
 +
|-
 +
| colspan="2"| Has Payload
 +
| colspan="2"| Boolean
 +
| The payload is only present if the cookie exists on the client.
 +
|-
 +
| colspan="2"| Payload Length
 +
| colspan="2"| VarInt
 +
| Length of the following byte array.
 +
|-
 +
| colspan="2"| Payload
 +
| colspan="2"| Optional Byte Array (5120)
 +
| The data of the cookie, if any.
 +
|}
  
==== Player Position ====  
+
==== Serverbound Known Packs ====
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=5| 0x04
 
| X || Double || Absolute position
 
|-
 
| Y || Double || Absolute position
 
|-
 
| Stance || Double || Used to modify the players bounding box when going up stairs, crouching, etc…
 
|-
 
| Z || Double || Absolute position
 
|-
 
| On Ground || Bool || True if the client is on the ground, False otherwise
 
|}
 
  
==== Player Look ====
+
ID 0x07, same structure as Clientbound Known Packs. If the client specifies a pack in this packet, the server should omit its contained data from Registry Data.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=3| 0x05
 
| Yaw || Float || Absolute rotation on the X Axis, in degrees
 
|-
 
| Pitch || Float || Absolute rotation on the Y Axis, in degrees
 
|-
 
| On Ground || Bool || True if the client is on the ground, False otherwise
 
|}
 
  
==== Player Position And Look ====
+
== Play ==
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=7| 0x06
 
| X || Double || Absolute position
 
|-
 
| Y || Double || Absolute position
 
|-
 
| Stance || Double || Used to modify the players bounding box when going up stairs, crouching, etc…
 
|-
 
| Z || Double || Absolute position
 
|-
 
| Yaw || Float || Absolute rotation on the X Axis, in degrees
 
|-
 
| Pitch || Float || Absolute rotation on the Y Axis, in degrees
 
|-
 
| On Ground || Bool || True if the client is on the ground, False otherwise
 
|}
 
  
==== Player Digging ====
+
=== Clientbound ===
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="5" | 0x07
 
| Status || Byte || The action the player is taking against the block (see below)
 
|-
 
| X || Int || Block position
 
|-
 
| Y || Byte || Block position
 
|-
 
| Z || Int || Block position
 
|-
 
| Face || Byte || The face being hit (see below)
 
|}
 
  
Status can (currently) be one of six values:
+
==== Cookie Request (play) ====
  
{| class="wikitable"
+
Requests a cookie that was previously stored.
! Meaning !! Value
 
|-
 
| Started digging || <code>0</code>
 
|-
 
| Cancelled digging || <code>1</code>
 
|-
 
| Finished digging || <code>2</code>
 
|-
 
| Drop item stack || <code>3</code>
 
|-
 
| Drop item || <code>4</code>
 
|-
 
| Shoot arrow / finish eating || <code>5</code>
 
|}
 
  
Notchian clients send a 0 (started digging) when they start digging and a 2 (finished digging) once they think they are finished. If digging is aborted, the client simply send a 1 (Cancel digging).
+
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
! Notes
 +
|-
 +
| rowspan="1"| 0x16
 +
| rowspan="1"| Play
 +
| rowspan="1"| Client
 +
| colspan="2"| Key
 +
| colspan="2"| Identifier
 +
| The identifier of the cookie.
 +
|}
  
Status code 4 (drop item) is a special case.  In-game, when you use the Drop Item command (keypress 'q'), a dig packet with a status of 4, and all other values set to 0, is sent from client to server. Status code 3 is similar, but drops the entire stack.
+
==== Debug Sample ====
  
Status code 5 (shoot arrow / finish eating) is also a special case. The x, y and z fields are all set to 0 like above, with the exception of the face field, which is set to 255.
+
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
| rowspan="3"| 0x1B
 +
| rowspan="3"| Play
 +
| rowspan="3"| Client
 +
| Sample Length
 +
| VarInt
 +
| The length of the following array.
 +
|-
 +
| Sample
 +
| Long Array
 +
| TODO: What is the structure of the data in this array?
 +
|-
 +
| Sample Type
 +
| VarInt Enum
 +
| The type of sample data. Currently always 0 (TICK_TIME).
 +
|}
  
The face can be one of six values, representing the face being hit:
+
==== Login (play) ====
  
 
{| class="wikitable"
 
{| class="wikitable"
|-
+
! Packet ID
| Value || 0 || 1 || 2 || 3 || 4 || 5
+
! State
|-
+
! Bound To
| Offset || -Y || +Y || -Z || +Z || -X || +X
+
! Field Name
|}
+
! Field Type
 +
! Notes
 +
|-
 +
| rowspan="22"| 0x2B
 +
| rowspan="22"| Play
 +
| rowspan="22"| Client
 +
| Entity ID
 +
| {{Type|Int}}
 +
| The player's Entity ID (EID).
 +
|-
 +
| Is hardcore
 +
| {{Type|Boolean}}
 +
|
 +
|-
 +
| Dimension Count
 +
| {{Type|VarInt}}
 +
| Size of the following array.
 +
|-
 +
| Dimension Names
 +
| {{Type|Array}} of {{Type|Identifier}}
 +
| Identifiers for all dimensions on the server.
 +
|-
 +
| Max Players
 +
| {{Type|VarInt}}
 +
| Was once used by the client to draw the player list, but now is ignored.
 +
|-
 +
| View Distance
 +
| {{Type|VarInt}}
 +
| Render distance (2-32).
 +
|-
 +
| Simulation Distance
 +
| {{Type|VarInt}}
 +
| The distance that the client will process specific things, such as entities.
 +
|-
 +
| Reduced Debug Info
 +
| {{Type|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
 +
| {{Type|Boolean}}
 +
| Set to false when the doImmediateRespawn gamerule is true.
 +
|-
 +
| Do limited crafting
 +
| {{Type|Boolean}}
 +
| Whether players can only craft recipes they have already unlocked. Currently unused by the client.
 +
|-
 +
| Dimension Type
 +
| {{change|Identifier|VarInt}}
 +
| The ID of the type of dimension in the <code>minecraft:dimension_type</code> registry, defined by the Registry Data packet.
 +
|-
 +
| Dimension Name
 +
| {{Type|Identifier}}
 +
| Name of the dimension being spawned into.
 +
|-
 +
| Hashed seed
 +
| {{Type|Long}}
 +
| First 8 bytes of the SHA-256 hash of the world's seed. Used client side for biome noise
 +
|-
 +
| Game mode
 +
| {{Type|Unsigned Byte}}
 +
| 0: Survival, 1: Creative, 2: Adventure, 3: Spectator.
 +
|-
 +
| Previous Game mode
 +
| {{Type|Byte}}
 +
| -1: Undefined (null), 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. The previous game mode. Vanilla client uses this for the debug (F3 + N & F3 + F4) game mode switch. (More information needed)
 +
|-
 +
| Is Debug
 +
| {{Type|Boolean}}
 +
| True if the world is a {{Minecraft Wiki|debug mode}} world; debug mode worlds cannot be modified and have predefined blocks.
 +
|-
 +
| Is Flat
 +
| {{Type|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.
 +
|-
 +
| Has death location
 +
| {{Type|Boolean}}
 +
| If true, then the next two fields are present.
 +
|-
 +
| Death dimension name
 +
| {{Type|Optional}} {{Type|Identifier}}
 +
| Name of the dimension the player died in.
 +
|-
 +
| Death location
 +
| {{Type|Optional}} {{Type|Position}}
 +
| The location that the player died at.
 +
|-
 +
| Portal cooldown
 +
| {{Type|VarInt}}
 +
| The number of ticks until the player can use the portal again.
 +
|-
 +
| Enforces Secure Chat
 +
| {{Type|Boolean}}
 +
|
 +
|}
  
In 1.7.3, when a player opens a door with left click the server receives Packet 0xE+start digging and opens the door.
+
==== Respawn ====
  
==== Player Block Placement ====
 
 
{| class="wikitable"
 
{| class="wikitable"
|-
+
! Packet ID
! Packet ID !! Field Name !! Field Type !! Notes
+
! State
|-
+
! Bound To
| rowspan="8" | 0x08
+
! Field Name
| X || Int || Block position
+
! Field Type
|-
+
! Notes
| Y || Unsigned Byte || Block position
+
|-
|-
+
| rowspan="12"| 0x47
| Z || Int || Block position
+
| rowspan="12"| Play
|-
+
| rowspan="12"| Client
| Direction || Byte || The offset to use for block/item placement (see below)
+
| Dimension Type
|-
+
| {{change|Identifier|VarInt}}
| Held item || [[Slot_Data|Slot]] ||
+
| The ID of the type of dimension in the <code>minecraft:dimension_type</code> registry, defined by the [[Protocol#Registry_Data|Registry Data]] packet.
|-
+
|-
| Cursor position X || Byte || The position of the crosshair on the block
+
| Dimension Name
|-
+
| {{Type|Identifier}}
| Cursor position Y || Byte ||
+
| Name of the dimension being spawned into.
|-
+
|-
| Cursor position Z || Byte ||
+
| Hashed seed
|}
+
| {{Type|Long}}
In normal operation (ie placing a block), this packet is sent once, with the values set normally.
+
| First 8 bytes of the SHA-256 hash of the world's seed. Used client side for biome noise
 +
|-
 +
| Game mode
 +
| {{Type|Unsigned Byte}}
 +
| 0: Survival, 1: Creative, 2: Adventure, 3: Spectator.
 +
|-
 +
| Previous Game mode
 +
| {{Type|Byte}}
 +
| -1: Undefined (null), 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. The previous game mode. Vanilla client uses this for the debug (F3 + N & F3 + F4) game mode switch. (More information needed)
 +
|-
 +
| Is Debug
 +
| {{Type|Boolean}}
 +
| True if the world is a {{Minecraft Wiki|debug mode}} world; debug mode worlds cannot be modified and have predefined blocks.
 +
|-
 +
| Is Flat
 +
| {{Type|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.
 +
|-
 +
| Has death location
 +
| {{Type|Boolean}}
 +
| If true, then the next two fields are present.
 +
|-
 +
| Death dimension Name
 +
| {{Type|Optional}} {{Type|Identifier}}
 +
| Name of the dimension the player died in.
 +
|-
 +
| Death location
 +
| {{Type|Optional}} {{Type|Position}}
 +
| The location that the player died at.
 +
|-
 +
| Portal cooldown
 +
| {{Type|VarInt}}
 +
| The number of ticks until the player can use the portal again.
 +
|-
 +
| Data kept
 +
| {{Type|Byte}}
 +
| Bit mask. 0x01: Keep attributes, 0x02: Keep metadata. Tells which data should be kept on the client side once the player has respawned.
 +
In the Notchian implementation, this is context dependent:
 +
* normal respawns (after death) keep no data;
 +
* exiting the end poem/credits keeps the attributes;
 +
* other dimension changes (portals or teleports) keep all data.
 +
|}
  
This packet has a special case where X, Y, Z, and Direction are all -1. (Note that Y is unsigned so set to 255.) This special packet indicates that the currently held item for the player should have its state updated such as eating food, shooting bows, using buckets, etc.
+
==== Store Cookie (play) ====
  
In a Notchian Beta client, the block or item ID corresponds to whatever the client is currently holding, and the client sends one of these packets any time a right-click is issued on a surface, so no assumptions can be made about the safety of the ID.  However, with the implementation of server-side inventory, a Notchian server seems to ignore the item ID, instead operating on server-side inventory information and holding selection. The client has been observed (1.2.5 and 1.3.2) to send both real item IDs and -1 in a single session.
+
Stores some arbitrary data on the client, which persists between server transfers. The Notchian client only accepts cookies of up to 5 kiB in size.
  
Special note on using buckets: When using buckets, the Notchian client might send two packets: first a normal and then a special case. The first normal packet is sent when you're looking at a block (e.g. the water you want to scoop up)This normal packet does not appear to do anything with a Notchian server. The second, special case packet appears to perform the action - based on current position/orientation and with a distance check - it appears that buckets can only be used within a radius of 6 units.
+
{| class="wikitable" {{added}}
 +
  ! Packet ID
 +
! State
 +
! Bound To
 +
! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
! Notes
 +
|-
 +
| rowspan="3"| 0x6B
 +
| rowspan="3"| Play
 +
| rowspan="3"| Client
 +
| colspan="2"| Key
 +
  | colspan="2"| Identifier
 +
  | The identifier of the cookie.
 +
|-
 +
| colspan="2"| Payload Length
 +
| colspan="2"| VarInt
 +
| Length of the following byte array.
 +
|-
 +
  | colspan="2"| Payload
 +
| colspan="2"| Byte Array (5120)
 +
  | The data of the cookie.
 +
|}
  
==== Held Item Change ====  
+
==== Transfer (play) ====
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=1 | 0x09
 
| Slot || Short || The slot which the player has selected (0-8)
 
|}
 
  
==== Animation ====
+
Notifies the client that it should transfer to the given server. Cookies previously stored are preserved between server transfers.
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=2 | 0x0A
 
| Entity ID || Int || Player ID
 
|-
 
| Animation || Byte || Animation ID
 
|}
 
  
 +
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
! Notes
 +
|-
 +
| rowspan="2"| 0x73
 +
| rowspan="2"| Play
 +
| rowspan="2"| Client
 +
| colspan="2"| Host
 +
| colspan="2"| String
 +
| The hostname of IP of the server.
 +
|-
 +
| colspan="2"| Port
 +
| colspan="2"| VarInt
 +
| The port of the server.
 +
|}
  
Animation can be one of the following values:
+
==== Update Attributes ====
  
{| class="wikitable"
+
Sets {{Minecraft Wiki|Attribute|attributes}} on the given entity.
! ID !! Animation
 
|-
 
| 0 || No animation
 
|-
 
| 1 || Swing arm
 
|-
 
| 2 || Damage animation
 
|-
 
| 3 || Leave bed
 
|-
 
| 5 || Eat food
 
|-
 
| 6 || Critical effect
 
|-
 
| 7 || Magic critical effect
 
|-
 
| 102 || (unknown)
 
|-
 
| 104 || Crouch
 
|-
 
| 105 || Uncrouch
 
|}
 
  
==== Entity Action ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan="3" | 0x0B
+
! Bound To
| Entity ID || Int || Player ID
+
! colspan="2"| Field Name
|-
+
! colspan="2"| Field Type
| Action ID || Byte || The ID of the action, see below.
+
! Notes
|-
+
|-
| Jump Boost || Int || Horse jump boost. Ranged from 0 -> 100.
+
| rowspan="6"| 0x71
|}
+
| rowspan="6"| Play
 +
| rowspan="6"| Client
 +
| colspan="2"| Entity ID
 +
| colspan="2"| VarInt
 +
|
 +
|-
 +
| colspan="2"| Number Of Properties
 +
| colspan="2"| VarInt
 +
| Number of elements in the following array.
 +
|-
 +
| rowspan="4"| Property
 +
| {{change|Key|Id}}
 +
| rowspan="4"| Array
 +
| {{change|Identifier|VarInt Enum}}
 +
| See below.
 +
|-
 +
| Value
 +
| Double
 +
| See below.
 +
|-
 +
| 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.
 +
|}
  
Action ID can be one of the following values:
+
Known Key values (see also {{Minecraft Wiki|Attribute#Modifiers}}):
  
{| class="wikitable"
+
These changed between 24w03b and 24w13a, TODO: Update this
! ID !! Action
 
|-
 
| 1 || Crouch
 
|-
 
| 2 || Uncrouch
 
|-
 
| 3 || Leave bed
 
|-
 
| 4 || Start sprinting
 
|-
 
| 5 || Stop sprinting
 
|}
 
  
==== Steer Vehicle ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
|-
|-
+
! Id
| rowspan="4" | 0x0C
+
! Key
| Sideways || Float || Positive to the left of the player
+
! Default
|-
+
! Min
| Forward || Float || Positive forward
+
! Max
|-
+
! Label
| Jump || Bool ||
+
|-
|-
+
| 0
| Unmount || Bool || True when leaving the vehicle
+
| generic.armor
|}
+
| 0.0
 +
| 0.0
 +
| 30.0
 +
| Armor.
 +
|-
 +
| 1
 +
| generic.armor_toughness
 +
| 0.0
 +
| 0.0
 +
| 20.0
 +
| Armor Toughness.
 +
|-
 +
| 2
 +
| generic.attack_damage
 +
| 2.0
 +
| 0.0
 +
| 2048.0
 +
| Attack Damage.
 +
|-
 +
| 3
 +
| generic.attack_knockback
 +
| 0.0
 +
| 0.0
 +
| 5.0
 +
| Attack Knockback.
 +
|-
 +
| 4
 +
| generic.attack_speed
 +
| 4.0
 +
| 0.0
 +
| 1024.0
 +
| Attack Speed.
 +
|- {{added}}
 +
| 5
 +
| generic.block_interaction_range
 +
| 4.5
 +
| 0.0
 +
| 64.0
 +
| Block Interaction Range.
 +
|- {{added}}
 +
| 6
 +
| generic.entity_interaction_range
 +
| 3.0
 +
| 0.0
 +
| 64.0
 +
| Entity Interaction Range.
 +
|-
 +
| 7
 +
| generic.flying_speed
 +
| 0.4
 +
| 0.0
 +
| 1024.0
 +
| Flying Speed.
 +
|-
 +
| 8
 +
| generic.follow_range
 +
| 32.0
 +
| 0.0
 +
| 2048.0
 +
| Follow Range.
 +
|-
 +
| 9
 +
| horse.jump_strength
 +
| 0.7
 +
| 0.0
 +
| 2.0
 +
| Jump Strength.
 +
|-
 +
| 10
 +
| generic.knockback_resistance
 +
| 0.0
 +
| 0.0
 +
| 1.0
 +
| Knockback Resistance.
 +
|-
 +
| 11
 +
| generic.luck
 +
| 0.0
 +
| -1024.0
 +
| 1024.0
 +
| Luck.
 +
|-
 +
| 12
 +
| generic.max_absorption
 +
| 0.0
 +
| 0.0
 +
| 2048.0
 +
| Max Absorption.
 +
|-
 +
| 13
 +
| generic.max_health
 +
| 20.0
 +
| 1.0
 +
| 1024.0
 +
| Max Health.
 +
|-
 +
| 14
 +
| generic.movement_speed
 +
| 0.7
 +
| 0.0
 +
| 1024.0
 +
| Movement Speed.
 +
|- {{added}}
 +
| 15
 +
| generic.scale
 +
| 1.0
 +
| 0.0625
 +
| 16.0
 +
| Scale.
 +
|-
 +
| 16
 +
| zombie.spawn_reinforcements
 +
| 0.0
 +
| 0.0
 +
| 1.0
 +
| Spawn Reinforcements Chance.
 +
|- {{added}}
 +
| 17
 +
| generic.step_height
 +
| 0.6
 +
| 0.0
 +
| 10.0
 +
| Step Height.
 +
|}
  
==== Close Window ====
+
''Modifier Data'' structure:
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| 0x0D
 
| Window id || byte || This is the id of the window that was closed. 0 for inventory.
 
|}
 
  
 
==== Click Window ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
|-
|-
+
! Field Name
| rowspan="6" | 0x0E
+
! Field Type
| Window ID || Byte || The id of the window which was clicked. 0 for player inventory.
+
! Notes
|-
+
|-
| Slot || Short || The clicked slot. See below.
+
| UUID
|-
+
| UUID
| Button || Byte || The button used in the click. See below.
+
|
|-
+
|-
| Action number || Short || A unique number for the action, used for transaction handling (See the Transaction packet).
+
| Amount
|-
+
| Double
| Mode || Byte || Inventory operation mode. See below.
+
| May be positive or negative.
|-
+
|-
| Clicked item || [[Slot_Data|Slot]] ||
+
| Operation
|}
+
| Byte
 +
| See below.
 +
|}
  
See [[Inventory#Windows|inventory windows]] for further information about how slots are indexed.
+
The operation controls how the base value of the modifier is changed.
  
When right-clicking on a stack of items, half the stack will be picked up and half left in the slot.  If the stack is an odd number, the half left in the slot will be smaller of the amounts.
+
* 0: Add/subtract amount
 +
* 1: Add/subtract amount percent of the current value
 +
* 2: Multiply by amount percent
  
The Action number is actually a counter, starting at 1.  This number is used by the server as a transaction ID to send back a [[#0x6A|Transaction packet]].
+
All of the 0's are applied first, and then the 1's, and then the 2's.
  
The distinct type of click performed by the client is determined by the combination of the "Mode" and "Button" fields.
+
==== Entity Effect ====
{| class="wikitable"
 
! Mode !! Button !! Slot !! Trigger
 
|-
 
! rowspan="2" | 0
 
| 0 || Normal || Left mouse click
 
|-
 
| 1 || Normal || Right mouse click
 
|-
 
! rowspan="2" | 1
 
| 0 || Normal || Shift + left mouse click
 
|-
 
| 1 || Normal || Shift + right mouse click ''(Identical behavior)''
 
|-
 
! rowspan="5" | 2
 
| 0 || Normal || Number key 1
 
|-
 
| 1 || Normal || Number key 2
 
|-
 
| 2 || Normal || Number key 3
 
|-
 
| ...
 
| ...
 
| ...
 
|-
 
| 8 || Normal || Number key 9
 
|-
 
! rowspan="1" | 3
 
| 2 || Normal || Middle click
 
|-
 
! rowspan="4" | 4
 
| 0 || Normal || Drop key (Q)
 
|-
 
| 1 || Normal || Ctrl + Drop key (Ctrl-Q)
 
|-
 
| 0 || -999 || Left click outside inventory holding nothing ''(No-op)''
 
|-
 
| 1 || -999 || Right click outside inventory holding nothing ''(No-op)''
 
|-
 
! rowspan="6" | 5
 
| 0 || -999 || Starting left mouse drag ''(Or middle mouse)''
 
|-
 
| 4 || -999 || Starting right mouse drag
 
|-
 
| 1 || Normal || Add slot for left-mouse drag
 
|-
 
| 5 || Normal || Add slot for right-mouse drag
 
|-
 
| 2 || -999 || Ending left mouse drag
 
|-
 
| 6 || -999 || Ending right mouse drag
 
|-
 
! 6
 
| 0 || Normal || Double click
 
|}
 
  
Starting from version 1.5, "painting mode" is available for use in inventory windows. It is done by picking up stack of something (more than 1 items), then holding mouse button (left, right or middle) and dragging holded stack over empty (or same type in case of right button ) slots. In that case client sends the following to server after mouse button release (omitting first pickup packet which is sent as usual):
 
 
# packet with mode 5, slot -999 , button (0 for left | 4 for right);
 
# packet for every slot painted on, mode is still 5, button (1 | 5);
 
# packet with mode 5, slot -999, button (2 | 6);
 
 
If any of the painting packets other than the "progress" ones are sent out of order (for example, a start, some slots, then another start; or a left-click in the middle) the painting status will be reset.
 
 
==== Confirm Transaction  ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan="3" | 0x0F
+
! Bound To
| Window ID || Byte || The id of the window that the action occurred in.
+
! Field Name
|-
+
! Field Type
| Action number || Short || Every action that is to be accepted has a unique number. This field corresponds to that number.
+
! Notes
|-
+
|-
| Accepted || Bool || Whether the action was accepted.
+
| rowspan="7"| 0x72
|}
+
| rowspan="7"| Play
 +
| rowspan="7"| Client
 +
| Entity ID
 +
| VarInt
 +
|
 +
|-
 +
| Effect ID
 +
| VarInt
 +
| See {{Minecraft Wiki|Status effect#Effect list|this table}}.
 +
|-
 +
| Amplifier
 +
| Byte
 +
| Notchian client displays effect level as Amplifier + 1.
 +
|-
 +
| Duration
 +
| VarInt
 +
| Duration in ticks. (-1 for infinite)
 +
|-
 +
| Flags
 +
| Byte
 +
| Bit field, see below.
 +
|- {{removed}}
 +
| Has Factor Data
 +
| Boolean
 +
| Used in DARKNESS effect
 +
|- {{removed}}
 +
| Factor Codec
 +
| NBT Tag
 +
| See below
 +
|}
  
==== Creative Inventory Action ====
+
{{Need Info|What exact effect does the blend bit flag have on the client? What happens if it is used on effects besides DARKNESS?}}
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="2" | 0x10
 
| Slot || Short || Inventory slot
 
|-
 
| Clicked item || [[Slot_Data|Slot]] ||
 
|}
 
  
==== Enchant Item ====
+
Within flags:
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="2" | 0x11
 
| Window ID || Byte || The ID sent by [[#0x64|Open Window]]
 
|-
 
| Enchantment || Byte || The position of the enchantment on the enchantment table window, starting with 0 as the topmost one.
 
|}
 
 
 
==== Update Sign ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="7" | 0x12
 
| X || Int || Block X Coordinate
 
|-
 
| Y || Short || Block Y Coordinate
 
|-
 
| Z || Int || Block Z Coordinate
 
|-
 
| Line 1 || String || First line of text in the sign
 
|-
 
| Line 2 || String || Second line of text in the sign
 
|-
 
| Line 3 || String || Third line of text in the sign
 
|-
 
| Line 4 || String || Fourth line of text in the sign
 
|}
 
 
 
==== Player Abilities ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="3" | 0x13
 
| Flags || Byte ||
 
|-
 
| Flying speed || Float|| previous integer value divided by 250
 
|-
 
| Walking speed || Float || previous integer value divided by 250
 
|}
 
 
 
==== Tab-Complete ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| 0x14
 
| Text || String ||
 
|}
 
 
 
 
 
==== Client Settings ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan="6" | 0x15
 
| Locale || String || en_GB
 
|-
 
| View distance || Byte || 0-3 for 'far', 'normal', 'short', 'tiny'.
 
|-
 
| Chat flags || Byte || Chat settings. See notes below.
 
|-
 
| ??? || Bool || ???
 
|-
 
| Difficulty || Byte || Client-side difficulty from options.txt
 
|-
 
| Show Cape || Bool || Client-side "show cape" option
 
|}
 
  
Chat flags has several values packed into one byte.
+
* 0x01: Is ambient - was the effect spawned from a beacon?  All beacon-generated effects are ambient. Ambient effects use a different icon in the HUD (blue border rather than gray).  If all effects on an entity are ambient, the [[Entity_metadata#Living Entity|"Is potion effect ambient" living metadata field]] should be set to true.  Usually should not be enabled.
 +
* 0x02: Show particles - should all particles from this effect be hidden?  Effects with particles hidden are not included in the calculation of the effect color, and are not rendered on the HUD (but are still rendered within the inventory).  Usually should be enabled.
 +
* 0x04: Show icon - should the icon be displayed on the client?  Usually should be enabled.
 +
* {{change||0x08: Blend - should the effect's hard-coded blending be applied?  Currently only used in the DARKNESS effect to apply extra void fog and adjust the gamma value for lighting.}}
  
'''Chat Enabled:''' Bits 0-1. 00: Enabled.  01: Commands only.  10: Hidden.
+
{{change|Factor Data|}}
 
+
{| class="wikitable" {{removed}}
'''Colors Enabled:''' Bit 3.  0: Disabled.  1: Enabled.
+
!Name
 
+
!Type
==== Client Status ====
+
!style="width: 250px;" colspan="2"| Notes
{| class="wikitable"
+
|-
! Packet ID !! Field Name !! Field Type !! Notes
+
| padding_duration
|-
+
| TAG_INT
| rowspan=1 | 0x16
+
|
| Action ID || Byte || See below
+
|-
|}
+
| factor_start
 
+
| TAG_FLOAT
Action ID values:
+
|
{| class="wikitable"
+
|-
|-
+
| factor_target
! Action ID !! Name
+
| TAG_FLOAT
|-
+
|
| 1 || Perform respawn
+
|-
|-
+
| factor_current
| 2 || Request stats
+
| TAG_FLOAT
|-
+
|
| 3 || Open inventory achievement
+
|-
|}
+
| effect_changed_timestamp
 
+
| TAG_INT
==== Plugin Message ====
+
|-
{| class="wikitable"
+
| factor_previous_frame
! Packet ID !! Field Name !! Field Type !! Notes
+
| TAG_FLOAT
|-
+
|-
| rowspan="3" | 0x17
+
| had_effect_last_tick
| Channel || String || Name of the "channel" used to send the data.
+
| TAG_BOOLEAN
|-
+
|}
| Length || Short || Length of the following byte array
 
|-
 
| Data || Byte Array || Any data.
 
|}
 
 
 
More documentation on this: http://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/
 
 
 
== Status ==
 
The status ping works as follows.
 
    C->S : Handshake State=1
 
    C->S : Request
 
    S->C : Response
 
    C->S : Ping
 
    S->C : Ping
 
 
 
=== Clientbound ===
 
 
 
==== Response ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=1 | 0x00
 
| JSON Response || String || https://gist.github.com/thinkofdeath/6927216
 
|}
 
 
 
 
 
==== Ping ====
 
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=1 | 0x01
 
| Time || Long || Should be the same as sent by the client
 
|}
 
  
 
=== Serverbound ===
 
=== Serverbound ===
  
==== Request ====
+
==== Chat Command ====
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=1 | 0x00 || || ||
 
|}
 
 
 
  
==== Ping ====
 
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID !! Field Name !! Field Type !! Notes
+
! Packet ID
|-
+
! State
| rowspan=1 | 0x01
+
! Bound To
| Time || Long ||
+
! colspan="2"| Field Name
|}
+
! colspan="2"| Field Type
 
+
! Notes
== Login ==
+
|-
 +
| rowspan="8"| 0x04
 +
| rowspan="8"| Play
 +
| rowspan="8"| Server
 +
| colspan="2"| Command
 +
| colspan="2"| {{Type|String}} (256)
 +
| colspan="2"| The command typed by the client.
 +
|- {{removed}}
 +
| colspan="2"| Timestamp
 +
| colspan="2"| {{Type|Long}}
 +
| colspan="2"| The timestamp that the command was executed.
 +
|- {{removed}}
 +
| colspan="2"| Salt
 +
| colspan="2"| {{Type|Long}}
 +
| colspan="2"| The salt for the following argument signatures.
 +
|- {{removed}}
 +
| colspan="2"| Array length
 +
| colspan="2"| {{Type|VarInt}}
 +
| colspan="2"| Number of entries in the following array. The maximum length in Notchian server is 8.
 +
|- {{removed}}
 +
| rowspan="2"| Array of argument signatures
 +
| Argument name
 +
| rowspan="2"| {{Type|Array}} (8)
 +
| {{Type|String}} (16)
 +
| The name of the argument that is signed by the following signature.
 +
|- {{removed}}
 +
| Signature
 +
| {{Type|Byte Array}} (256)
 +
| The signature that verifies the argument. Always 256 bytes and is not length-prefixed.
 +
|- {{removed}}
 +
| colspan="2"| Message Count
 +
| colspan="2"| {{Type|VarInt}}
 +
| colspan="2"|
 +
|- {{removed}}
 +
| colspan="2"| Acknowledged
 +
| colspan="2"| {{Type|Fixed BitSet}} (20)
 +
| colspan="2"|
 +
|}
  
The login process is as follows:
 
    C->S : Handshake State=2
 
    C->S : Login Start
 
    S->C : Encryption Key Request
 
    C->S : Encryption Key Response
 
    (Auth & enable encryption)
 
    S->S : Login Success
 
  
=== Clientbound ===
+
==== Signed Chat Command ====
  
==== Disconnect ====
+
{| class="wikitable" {{added}}
{| class="wikitable"
+
! Packet ID
! Packet ID !! Field Name !! Field Type !! Notes
+
! State
|-
+
! Bound To
| rowspan=1 | 0x00
+
! colspan="2"| Field Name
| JSON Data || String ||
+
! colspan="2"| Field Type
|}
+
! Notes
 
+
|-
==== Encryption Response ====
+
| rowspan="8"| 0x05
{| class="wikitable"
+
| rowspan="8"| Play
! Packet ID !! Field Name !! Field Type !! Notes
+
| rowspan="8"| Server
|-
+
| colspan="2"| Command
| rowspan=5 | 0x01
+
| colspan="2"| String(256)
| Server ID || String ||
+
| The command typed by the client.
|-
+
|-
| Length || Short || length of public key
+
| colspan="2"| Timestamp
|-
+
| colspan="2"| Long
| || Byte array || public key
+
| The timestamp that the command was executed. Milliseconds since the Unix epoch.
|-
+
|-
| Length || Short || length of verify token
+
| colspan="2"| Salt
|-
+
| colspan="2"| Long
| || Byte array || verify token
+
| The salt for the following argument signatures.
|-  
+
|-
|}
+
| colspan="2"| Argument Signature Count
 +
| colspan="2"| VarInt
 +
| Number of elements in the following array. The maximum length in Notchian server is 8.
 +
|-
 +
| rowspan="2"| Argument Signatures
 +
| Name
 +
| rowspan="2"| Array
 +
| String(16)
 +
| The name of the argument that is signed by the following signature.
 +
|-
 +
| Signature
 +
| ByteArray(256)
 +
| The signature that verifies the argument. Always 256 bytes and is not length-prefixed.
 +
|-
 +
| colspan="2"| Seen Messages Offset
 +
| colspan="2"| VarInt
 +
|
 +
|-
 +
| colspan="2"| Seen Messages Acknowledged
 +
| colspan="2"| Fixed BitSet(20)
 +
|
 +
|}
  
==== Login Success ====
+
==== Cookie Response (play) ====
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=2 | 0x02
 
| UUID || String ||
 
|-
 
| Username || String ||
 
|}
 
  
=== Serverbound ===
+
Response to a [[#Cookie_Request_(play)|Cookie Request (play)]] from the server. The Notchian server only accepts responses of up to 5 kiB in size.
  
==== Login Start  ====
+
{| class="wikitable" {{added}}
{| class="wikitable"
+
! Packet ID
! Packet ID !! Field Name !! Field Type !! Notes
+
! State
|-
+
! Bound To
| rowspan=1 | 0x00
+
! colspan="2"| Field Name
| Name || String ||  
+
! colspan="2"| Field Type
|}
+
! Notes
 +
|-
 +
| rowspan="4"| 0x11
 +
| rowspan="4"| Play
 +
| rowspan="4"| Server
 +
| colspan="2"| Key
 +
| colspan="2"| Identifier
 +
| The identifier of the cookie.
 +
|-
 +
| colspan="2"| Has Payload
 +
| colspan="2"| Boolean
 +
| The payload is only present if the cookie exists on the client.
 +
|-
 +
| colspan="2"| Payload Length
 +
| colspan="2"| Optional VarInt
 +
| Length of the following byte array.
 +
|-
 +
| colspan="2"| Payload
 +
| colspan="2"| Optional Byte Array (5120)
 +
| The data of the cookie, if any.
 +
|}
  
==== Encryption Request ====
+
==== Debug Sample Subscription ====
{| class="wikitable"
 
! Packet ID !! Field Name !! Field Type !! Notes
 
|-
 
| rowspan=4 | 0x01
 
| Length || Short || length of public key
 
|-
 
| || Byte array || public key
 
|-
 
| Length || Short || length of verify token
 
|-
 
| || Byte array || verify token
 
|-
 
|}
 
  
== Plugin Channels ==
+
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
| 0x13
 +
| Play
 +
| Server
 +
| Sample Type
 +
| VarInt Enum
 +
| The type of debug sample to subscribe to. Currently always 0 (TICK_TIME).
 +
|}
  
=== MC|RPack ===
+
[[Category:Minecraft Modern]]
{| class="wikitable"
 
! Field Name !! Field Type !! Example !! Notes
 
|-
 
| Resource pack URL || UTF8 string || http://example.com/pack.zip ||
 
|}
 

Revision as of 19:57, 25 April 2024

This page documents the changes from the last stable Minecraft release (currently 1.20.4, protocol 765) to the current pre-release (currently 24w13a, protocol Snapshot 182). 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
Handshake serverbound
0x00 Handshake Current Pre
Login clientbound
0x01 Encryption Request Current Pre
0x05 Cookie Request (login) Pre
Login serverbound
0x04 Cookie Response (login) Pre
Configuration clientbound
0x00 Cookie Request (configuration) Pre
0x00 0x01 Clientbound Plugin Message (configuration) Current (unchanged)
0x01 0x02 Disconnect (configuration) Current (unchanged)
0x02 0x03 Finish Configuration Current (unchanged)
0x03 0x04 Clientbound Keep Alive (configuration) Current (unchanged)
0x04 0x05 Ping (configuration) Current (unchanged)
0x06 Reset Chat Pre
0x05 0x07 Registry Data Current Pre
0x06 0x08 Remove Resource Pack (configuration) Current (unchanged)
0x07 0x09 Add Resource Pack (configuration) Current (unchanged)
0x0A Store Cookie (configuration) Pre
0x0B Transfer (configuration) Pre
0x08 0x0C Feature Flags Current (unchanged)
0x09 0x0D Update Tags (configuration) Current (unchanged)
0x0E Clientbound Known Packs Pre
Configuration serverbound
0x01 Cookie Response (configuration) Pre
0x01 0x02 Serverbound Plugin Message (configuration) Current (unchanged)
0x02 0x03 Finish Configuration Current (unchanged)
0x03 0x04 Serverbound Keep Alive (configuration) Current (unchanged)
0x04 0x05 Pong (configuration) Current (unchanged)
0x05 0x06 Resource Pack Response (configuration) Current (unchanged)
0x07 Serverbound Known Packs Pre
Play clientbound
0x16 Cookie Request (Play) Pre
0x16 0x17 Set Cooldown Current (unchanged)
0x17 0x18 Chat Suggestions Current (unchanged)
0x18 0x19 Clientbound Plugin Message (play) Current (unchanged)
0x19 0x1A Damage Event Current (unchanged)
0x1B Debug Sample Pre
0x1A 0x1C Delete Message Current (unchanged)
0x1B 0x1D Disconnect (play) Current (unchanged)
0x1C 0x1E Disguised Chat Message Current (unchanged)
0x1D 0x1F Entity Event Current (unchanged)
0x1E 0x20 Explosion Current (unchanged)
0x1F 0x21 Unload Chunk Current (unchanged)
0x20 0x22 Game Event Current (unchanged)
0x21 0x23 Open Horse Screen Current (unchanged)
0x22 0x24 Hurt Animation Current (unchanged)
0x23 0x25 Initialize World Border Current (unchanged)
0x24 0x26 Clientbound Keep Alive (play) Current (unchanged)
0x25 0x27 Chunk Data and Update Light Current (unchanged)
0x26 0x28 World Event Current (unchanged)
0x27 0x29 Particle Current (unchanged)
0x28 0x2A Update Light Current (unchanged)
0x29 0x2B Login (play) Current Pre
0x2A 0x2C Map Data Current (unchanged)
0x2B 0x2D Merchant Offers Current (unchanged)
0x2C 0x2E Update Entity Position Current (unchanged)
0x2D 0x2F Update Entity Position and Rotation Current (unchanged)
0x2E 0x30 Update Entity Rotation Current (unchanged)
0x2F 0x31 Move Vehicle Current (unchanged)
0x30 0x32 Open Book Current (unchanged)
0x31 0x33 Open Screen Current (unchanged)
0x32 0x34 Open Sign Editor Current (unchanged)
0x33 0x35 Ping (play) Current (unchanged)
0x34 0x36 Ping Response (play) Current (unchanged)
0x35 0x37 Place Ghost Recipe Current (unchanged)
0x36 0x38 Player Abilities Current (unchanged)
0x37 0x39 Player Chat Message Current (unchanged)
0x38 0x3A End Combat Current (unchanged)
0x39 0x3B Enter Combat Current (unchanged)
0x3A 0x3C Combat Death Current (unchanged)
0x3B 0x3D Player Info Remove Current (unchanged)
0x3C 0x3E Player Info Update Current (unchanged)
0x3D 0x3F Look At Current (unchanged)
0x3E 0x40 Synchronize Player Position Current (unchanged)
0x3F 0x41 Update Recipe Book Current (unchanged)
0x40 0x42 Remove Entities Current (unchanged)
0x41 0x43 Remove Entity Effect Current (unchanged)
0x42 0x44 Reset Score Current (unchanged)
0x43 0x45 Remove Resource Pack (play) Current (unchanged)
0x44 0x46 Add Resource Pack (play) Current (unchanged)
0x45 0x47 Respawn Current Pre
0x46 0x48 Set Head Rotation Current (unchanged)
0x47 0x49 Update Section Blocks Current (unchanged)
0x48 0x4A Select Advancements Tab Current (unchanged)
0x49 0x4B Server Data Current (unchanged)
0x4A 0x4C Set Action Bar Text Current (unchanged)
0x4B 0x4D Set Border Center Current (unchanged)
0x4C 0x4E Set Border Lerp Size Current (unchanged)
0x4D 0x4F Set Border Size Current (unchanged)
0x4E 0x50 Set Border Warning Delay Current (unchanged)
0x4F 0x51 Set Border Warning Distance Current (unchanged)
0x50 0x52 Set Camera Current (unchanged)
0x51 0x53 Set Held Item Current (unchanged)
0x52 0x54 Set Center Chunk Current (unchanged)
0x53 0x55 Set Render Distance Current (unchanged)
0x54 0x56 Set Default Spawn Position Current (unchanged)
0x55 0x57 Display Objective Current (unchanged)
0x56 0x58 Set Entity Metadata Current (unchanged)
0x57 0x59 Link Entities Current (unchanged)
0x58 0x5A Set Entity Velocity Current (unchanged)
0x59 0x5B Set Equipment Current (unchanged)
0x5A 0x5C Set Experience Current (unchanged)
0x5B 0x5D Set Health Current (unchanged)
0x5C 0x5E Update Objectives Current (unchanged)
0x5D 0x5F Set Passengers Current (unchanged)
0x5E 0x60 Update Teams Current (unchanged)
0x5F 0x61 Update Score Current (unchanged)
0x60 0x62 Set Simulation Distance Current (unchanged)
0x61 0x63 Set Subtitle Text Current (unchanged)
0x62 0x64 Update Time Current (unchanged)
0x63 0x65 Set Title Text Current (unchanged)
0x64 0x66 Set Title Animation Times Current (unchanged)
0x65 0x67 Entity Sound Effect Current (unchanged)
0x66 0x68 Sound Effect Current (unchanged)
0x67 0x69 Start Configuration Current (unchanged)
0x68 0x6A Stop Sound Current (unchanged)
0x6B Store Cookie (Play) Pre
0x69 0x6C System Chat Message Current (unchanged)
0x6A 0x6D Set Tab List Header And Footer Current (unchanged)
0x6B 0x6E Tag Query Response Current (unchanged)
0x6C 0x6F Pickup Item Current (unchanged)
0x6D 0x70 Teleport Entity Current (unchanged)
0x6E 0x71 Set Ticking State Current (unchanged)
0x6F 0x72 Step Tick Current (unchanged)
0x73 Transfer (Play) Pre
0x70 0x74 Update Advancements Current (unchanged)
0x71 0x75 Update Attributes Current Pre
0x72 0x76 Entity Effect Current Pre
0x73 0x77 Update Recipes Current (unchanged)
0x74 0x78 Update Tags (play) Current (unchanged)
Play serverbound
0x04 Chat Command Current Pre
0x05 Signed Chat Command Pre
0x05 0x06 Chat Message Current (unchanged)
0x06 0x07 Player Session Current (unchanged)
0x07 0x08 Chunk Batch Received Current (unchanged)
0x08 0x09 Client Status Current (unchanged)
0x09 0x0A Client Information (play) Current (unchanged)
0x0A 0x0B Command Suggestions Request Current (unchanged)
0x0B 0x0C Acknowledge Configuration Current (unchanged)
0x0C 0x0D Click Container Button Current (unchanged)
0x0D 0x0E Click Container Current (unchanged)
0x0E 0x0F Close Container Current (unchanged)
0x0F 0x10 Change Container Slot State Current (unchanged)
0x11 Cookie Response (play) Pre
0x10 0x12 Serverbound Plugin Message (play) Current (unchanged)
0x13 Debug Sample Subscription Pre
0x11 0x14 Edit Book Current (unchanged)
0x12 0x15 Query Entity Tag Current (unchanged)
0x13 0x16 Interact Current (unchanged)
0x14 0x17 Jigsaw Generate Current (unchanged)
0x15 0x18 Serverbound Keep Alive (play) Current (unchanged)
0x16 0x19 Lock Difficulty Current (unchanged)
0x17 0x1A Set Player Position Current (unchanged)
0x18 0x1B Set Player Position and Rotation Current (unchanged)
0x19 0x1C Set Player Rotation Current (unchanged)
0x1A 0x1D Set Player On Ground Current (unchanged)
0x1B 0x1E Move Vehicle Current (unchanged)
0x1C 0x1F Paddle Boat Current (unchanged)
0x1D 0x20 Pick Item Current (unchanged)
0x1E 0x21 Ping Request (play) Current (unchanged)
0x1F 0x22 Place Recipe Current (unchanged)
0x20 0x23 Player Abilities Current (unchanged)
0x21 0x24 Player Action Current (unchanged)
0x22 0x25 Player Command Current (unchanged)
0x23 0x26 Player Input Current (unchanged)
0x24 0x27 Pong (play) Current (unchanged)
0x25 0x28 Change Recipe Book Settings Current (unchanged)
0x26 0x29 Set Seen Recipe Current (unchanged)
0x27 0x2A Rename Item Current (unchanged)
0x28 0x2B Resource Pack Response (play) Current (unchanged)
0x29 0x2C Seen Advancements Current (unchanged)
0x2A 0x2D Select Trade Current (unchanged)
0x2B 0x2E Set Beacon Effect Current (unchanged)
0x2C 0x2F Set Held Item Current (unchanged)
0x2D 0x30 Program Command Block Current (unchanged)
0x2E 0x31 Program Command Block Minecart Current (unchanged)
0x2F 0x32 Set Creative Mode Slot Current (unchanged)
0x30 0x33 Program Jigsaw Block Current (unchanged)
0x31 0x34 Program Structure Block Current (unchanged)
0x32 0x35 Update Sign Current (unchanged)
0x33 0x36 Swing Arm Current (unchanged)
0x34 0x37 Teleport To Entity Current (unchanged)
0x35 0x38 Use Item On Current (unchanged)
0x36 0x39 Use Item Current (unchanged)

New/modified data types

No changes so far.

Entity Metadata

Type Name Value Notes
0 Byte Byte
1 VarInt VarInt
2 VarLong VarLong
3 Float Float
4 String String
5 Text Component Text Component
6 Optional Text Component (Boolean, Optional Text Component) Text Component is present if the Boolean is set to true.
7 Slot Slot
8 Boolean Boolean
9 Rotations (Float, Float, Float) rotation on x, rotation on y, rotation on z
10 Position Position
11 Optional Position (Boolean, Optional Position) Position is present if the Boolean is set to true.
12 Direction VarInt Enum Down = 0, Up = 1, North = 2, South = 3, West = 4, East = 5
13 Optional UUID (Boolean, Optional UUID) UUID is present if the Boolean is set to true.
14 Block State VarInt An ID in the block state registry.
15 Optional Block State VarInt 0 for absent (air is unrepresentable); otherwise, an ID in the block state registry.
16 NBT NBT
17 Particle (VarInt, Varies) particle type (an ID in the minecraft:particle_type registry), particle data (See Particles.)
18 Particles (VarInt, Array of Particle) length of array, particle data (See directly above.)
18 19 Villager Data (VarInt, VarInt, VarInt) villager type, villager profession, level (See below.)
19 20 Optional VarInt VarInt 0 for absent; 1 + actual value otherwise. Used for entity IDs.
20 21 Pose VarInt Enum STANDING = 0, FALL_FLYING = 1, SLEEPING = 2, SWIMMING = 3, SPIN_ATTACK = 4, SNEAKING = 5, LONG_JUMPING = 6, DYING = 7, CROAKING = 8, USING_TONGUE = 9, SITTING = 10, ROARING = 11, SNIFFING = 12, EMERGING = 13, DIGGING = 14, SLIDING = 15, SHOOTING = 16, INHALING = 17
21 22 Cat Variant VarInt An ID in the minecraft:cat_variant registry.
22 23 Wolf Variant VarInt An ID in the minecraft:wolf_variant registry.
22 24 Frog Variant VarInt An ID in the minecraft:frog_variant registry.
23 25 Optional Global Position (Boolean, Optional Identifier, Optional Position) dimension identifier, position; only if the Boolean is set to true.
24 26 Painting Variant VarInt An ID in the minecraft:painting_variant registry.
25 27 Sniffer State VarInt Enum IDLING = 0, FEELING_HAPPY = 1, SCENTING = 2, SNIFFING = 3, SEARCHING = 4, DIGGING = 5, RISING = 6
26 28 Armadillo State VarInt Enum IDLE = 0, ROLLING = 1, SCARED = 2
26 29 Vector3 (Float, Float, Float) x, y, z
27 30 Quaternion (Float, Float, Float, Float) x, y, z, w

Living Entity

TODO: This has changed to use the PARTICLES attribute

Wolf

Extends Tameable Animal.Inherited entity Tameable Animal does not existInherited entity Tameable Animal does not exist

Index Type Meaning Default
0 Wolf Variant (22 23) Wolf Variant PALE
1 Boolean (8) Is begging false
2 VarInt (1) Collar color (values are those used with dyes) 14 (Red)
3 VarInt (1) Anger time 0

Armadillo

Extends Animal.

Index Type Meaning Default
17 Armadillo State (26 28) Armadillo State IDLE

Block Actions

No changes so far.

Inventories

No changes so far.

Plugin Channels

No changes so far.

Handshake

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 765 in Minecraft 1.20.4).
Server Address String (255) 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 simple redirect, e.g. if _minecraft._tcp.example.com points to mc.example.org, users connecting to example.com will provide 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, 3 for Transfer.

Status

Clientbound

No changes so far.

Serverbound

No changes so far.

Login

Clientbound

Encryption Request

Packet ID State Bound To Field Name Field Type Notes
0x01 Login Client Server ID String (20) Appears to be empty.
Public Key Length VarInt Length of Public Key.
Public Key Byte Array The server's public key, in bytes.
Verify Token Length VarInt Length of Verify Token. Always 4 for Notchian servers.
Verify Token Byte Array A sequence of random bytes generated by the server.
Should Authenticate Boolean

Cookie Request (login)

Requests a cookie that was previously stored.

Packet ID State Bound To Field Name Field Type Notes
0x05 Login Client Key Identifier The identifier of the cookie.

Serverbound

Cookie Response (login)

Response to a Cookie Request (login) from the server. The Notchian server only accepts responses of up to 5 kiB in size.

Packet ID State Bound To Field Name Field Type Notes
0x04 Login Server Key Identifier The identifier of the cookie.
Has Payload Boolean The payload is only present if the cookie exists on the client.
Payload Length VarInt Length of the following byte array.
Payload Optional Byte Array (5120) The data of the cookie, if any.

Configuration

Clientbound

Cookie Request (configuration)

Requests a cookie that was previously stored.

Packet ID State Bound To Field Name Field Type Notes
0x00 Configuration Client Key Identifier The identifier of the cookie.

Reset Chat

Packet ID State Bound To Field Name Field Type Notes
0x06 Configuration Client no fields

Registry Data

Represents certain registries that are sent from the server and are applied on the client. The packet is sent for each of the following registries: minecraft:worldgen/biome, minecraft:chat_type, minecraft:trim_pattern, minecraft:trim_material, minecraft:wolf_variant, minecraft:dimension_type, minecraft:damage_type, and minecraft:banner_pattern.

Packet ID State Bound To Field Name Field Type Notes
0x07 Configuration Client Registry Codec NBT (Compound) See Registry Data.
Registry ID Identifier
Entry Count VarInt Number of entries in the following array.
Entries Entry ID Array Identifier
Has Data Boolean Whether the entry has any data following.
Data NBT Tag Entry data. Only present if Has Data is true.

Store Cookie (configuration)

Stores some arbitrary data on the client, which persists between server transfers. The Notchian client only accepts cookies of up to 5 kiB in size.

Packet ID State Bound To Field Name Field Type Notes
0x0A Configuration Client Key Identifier The identifier of the cookie.
Payload ByteArray(5120) The data of the cookie.

Transfer (configuration)

Notifies the client that it should transfer to the given server. Cookies previously stored are preserved between server transfers.

Packet ID State Bound To Field Name Field Type Notes
0x0B Configuration Client Host String The hostname of IP of the server.
Port VarInt The port of the server.

Clientbound Known Packs

Informs the client of which data packs are present on the server. The client is expected to respond with its own Serverbown Known Packs packet. The Notchian server does not continue with Configuration until it receives a response.

Packet ID State Bound To Field Name Field Type Notes
0x0E Configuration Client Known Pack Count VarInt The number of known packs in the following array.
Known Packs Namespace Array String
ID String
Version String

Serverbound

Cookie Response (configuration)

Response to a Cookie Request (configuration) from the server. The Notchian server only accepts responses of up to 5 kiB in size.

Packet ID State Bound To Field Name Field Type Notes
0x01 Configuration Server Key Identifier The identifier of the cookie.
Has Payload Boolean The payload is only present if the cookie exists on the client.
Payload Length VarInt Length of the following byte array.
Payload Optional Byte Array (5120) The data of the cookie, if any.

Serverbound Known Packs

ID 0x07, same structure as Clientbound Known Packs. If the client specifies a pack in this packet, the server should omit its contained data from Registry Data.

Play

Clientbound

Cookie Request (play)

Requests a cookie that was previously stored.

Packet ID State Bound To Field Name Field Type Notes
0x16 Play Client Key Identifier The identifier of the cookie.

Debug Sample

Packet ID State Bound To Field Name Field Type Notes
0x1B Play Client Sample Length VarInt The length of the following array.
Sample Long Array TODO: What is the structure of the data in this array?
Sample Type VarInt Enum The type of sample data. Currently always 0 (TICK_TIME).

Login (play)

Packet ID State Bound To Field Name Field Type Notes
0x2B Play Client Entity ID Int The player's Entity ID (EID).
Is hardcore Boolean
Dimension Count VarInt Size of the following array.
Dimension Names Array of Identifier Identifiers for all dimensions on the server.
Max Players VarInt Was once used by the client to draw the player list, but now is ignored.
View Distance VarInt Render distance (2-32).
Simulation Distance VarInt The distance that the client will process specific things, such as entities.
Reduced Debug Info Boolean If true, a Notchian client shows reduced information on the 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.
Do limited crafting Boolean Whether players can only craft recipes they have already unlocked. Currently unused by the client.
Dimension Type Identifier VarInt The ID of the type of dimension in the minecraft:dimension_type registry, defined by the Registry Data packet.
Dimension Name Identifier Name of the dimension being spawned into.
Hashed seed Long First 8 bytes of the SHA-256 hash of the world's seed. Used client side for biome noise
Game mode Unsigned Byte 0: Survival, 1: Creative, 2: Adventure, 3: Spectator.
Previous Game mode Byte -1: Undefined (null), 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. The previous game mode. Vanilla client uses this for the debug (F3 + N & F3 + F4) game mode switch. (More information needed)
Is Debug Boolean True if the world is a debug mode world; debug mode worlds cannot be modified and have predefined blocks.
Is Flat Boolean True if the world is a superflat world; flat worlds have different void fog and a horizon at y=0 instead of y=63.
Has death location Boolean If true, then the next two fields are present.
Death dimension name Optional Identifier Name of the dimension the player died in.
Death location Optional Position The location that the player died at.
Portal cooldown VarInt The number of ticks until the player can use the portal again.
Enforces Secure Chat Boolean

Respawn

Packet ID State Bound To Field Name Field Type Notes
0x47 Play Client Dimension Type Identifier VarInt The ID of the type of dimension in the minecraft:dimension_type registry, defined by the Registry Data packet.
Dimension Name Identifier Name of the dimension being spawned into.
Hashed seed Long First 8 bytes of the SHA-256 hash of the world's seed. Used client side for biome noise
Game mode Unsigned Byte 0: Survival, 1: Creative, 2: Adventure, 3: Spectator.
Previous Game mode Byte -1: Undefined (null), 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. The previous game mode. Vanilla client uses this for the debug (F3 + N & F3 + F4) game mode switch. (More information needed)
Is Debug Boolean True if the world is a debug mode world; debug mode worlds cannot be modified and have predefined blocks.
Is Flat Boolean True if the world is a superflat world; flat worlds have different void fog and a horizon at y=0 instead of y=63.
Has death location Boolean If true, then the next two fields are present.
Death dimension Name Optional Identifier Name of the dimension the player died in.
Death location Optional Position The location that the player died at.
Portal cooldown VarInt The number of ticks until the player can use the portal again.
Data kept Byte Bit mask. 0x01: Keep attributes, 0x02: Keep metadata. Tells which data should be kept on the client side once the player has respawned.

In the Notchian implementation, this is context dependent:

  • normal respawns (after death) keep no data;
  • exiting the end poem/credits keeps the attributes;
  • other dimension changes (portals or teleports) keep all data.

Store Cookie (play)

Stores some arbitrary data on the client, which persists between server transfers. The Notchian client only accepts cookies of up to 5 kiB in size.

Packet ID State Bound To Field Name Field Type Notes
0x6B Play Client Key Identifier The identifier of the cookie.
Payload Length VarInt Length of the following byte array.
Payload Byte Array (5120) The data of the cookie.

Transfer (play)

Notifies the client that it should transfer to the given server. Cookies previously stored are preserved between server transfers.

Packet ID State Bound To Field Name Field Type Notes
0x73 Play Client Host String The hostname of IP of the server.
Port VarInt The port of the server.

Update Attributes

Sets attributes on the given entity.

Packet ID State Bound To Field Name Field Type Notes
0x71 Play Client Entity ID VarInt
Number Of Properties VarInt Number of elements in the following array.
Property Key Id Array Identifier VarInt Enum See below.
Value Double See below.
Number Of Modifiers VarInt Number of elements in the following array.
Modifiers Array of Modifier Data See Attribute#Modifiers. Modifier Data defined below.

Known Key values (see also Attribute#Modifiers):

These changed between 24w03b and 24w13a, TODO: Update this

Id Key Default Min Max Label
0 generic.armor 0.0 0.0 30.0 Armor.
1 generic.armor_toughness 0.0 0.0 20.0 Armor Toughness.
2 generic.attack_damage 2.0 0.0 2048.0 Attack Damage.
3 generic.attack_knockback 0.0 0.0 5.0 Attack Knockback.
4 generic.attack_speed 4.0 0.0 1024.0 Attack Speed.
5 generic.block_interaction_range 4.5 0.0 64.0 Block Interaction Range.
6 generic.entity_interaction_range 3.0 0.0 64.0 Entity Interaction Range.
7 generic.flying_speed 0.4 0.0 1024.0 Flying Speed.
8 generic.follow_range 32.0 0.0 2048.0 Follow Range.
9 horse.jump_strength 0.7 0.0 2.0 Jump Strength.
10 generic.knockback_resistance 0.0 0.0 1.0 Knockback Resistance.
11 generic.luck 0.0 -1024.0 1024.0 Luck.
12 generic.max_absorption 0.0 0.0 2048.0 Max Absorption.
13 generic.max_health 20.0 1.0 1024.0 Max Health.
14 generic.movement_speed 0.7 0.0 1024.0 Movement Speed.
15 generic.scale 1.0 0.0625 16.0 Scale.
16 zombie.spawn_reinforcements 0.0 0.0 1.0 Spawn Reinforcements Chance.
17 generic.step_height 0.6 0.0 10.0 Step Height.

Modifier Data structure:

Field Name Field Type Notes
UUID UUID
Amount Double May be positive or negative.
Operation Byte 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.

Entity Effect

Packet ID State Bound To Field Name Field Type Notes
0x72 Play Client Entity ID VarInt
Effect ID VarInt See this table.
Amplifier Byte Notchian client displays effect level as Amplifier + 1.
Duration VarInt Duration in ticks. (-1 for infinite)
Flags Byte Bit field, see below.
Has Factor Data Boolean Used in DARKNESS effect
Factor Codec NBT Tag See below
Huh.png The following information needs to be added to this page:
What exact effect does the blend bit flag have on the client? What happens if it is used on effects besides DARKNESS?

Within flags:

  • 0x01: Is ambient - was the effect spawned from a beacon? All beacon-generated effects are ambient. Ambient effects use a different icon in the HUD (blue border rather than gray). If all effects on an entity are ambient, the "Is potion effect ambient" living metadata field should be set to true. Usually should not be enabled.
  • 0x02: Show particles - should all particles from this effect be hidden? Effects with particles hidden are not included in the calculation of the effect color, and are not rendered on the HUD (but are still rendered within the inventory). Usually should be enabled.
  • 0x04: Show icon - should the icon be displayed on the client? Usually should be enabled.
  • 0x08: Blend - should the effect's hard-coded blending be applied? Currently only used in the DARKNESS effect to apply extra void fog and adjust the gamma value for lighting.

Factor Data

Name Type Notes
padding_duration TAG_INT
factor_start TAG_FLOAT
factor_target TAG_FLOAT
factor_current TAG_FLOAT
effect_changed_timestamp TAG_INT
factor_previous_frame TAG_FLOAT
had_effect_last_tick TAG_BOOLEAN

Serverbound

Chat Command

Packet ID State Bound To Field Name Field Type Notes
0x04 Play Server Command String (256) The command typed by the client.
Timestamp Long The timestamp that the command was executed.
Salt Long The salt for the following argument signatures.
Array length VarInt Number of entries in the following array. The maximum length in Notchian server is 8.
Array of argument signatures Argument name Array (8) String (16) The name of the argument that is signed by the following signature.
Signature Byte Array (256) The signature that verifies the argument. Always 256 bytes and is not length-prefixed.
Message Count VarInt
Acknowledged Fixed BitSet (20)


Signed Chat Command

Packet ID State Bound To Field Name Field Type Notes
0x05 Play Server Command String(256) The command typed by the client.
Timestamp Long The timestamp that the command was executed. Milliseconds since the Unix epoch.
Salt Long The salt for the following argument signatures.
Argument Signature Count VarInt Number of elements in the following array. The maximum length in Notchian server is 8.
Argument Signatures Name Array String(16) The name of the argument that is signed by the following signature.
Signature ByteArray(256) The signature that verifies the argument. Always 256 bytes and is not length-prefixed.
Seen Messages Offset VarInt
Seen Messages Acknowledged Fixed BitSet(20)

Cookie Response (play)

Response to a Cookie Request (play) from the server. The Notchian server only accepts responses of up to 5 kiB in size.

Packet ID State Bound To Field Name Field Type Notes
0x11 Play Server Key Identifier The identifier of the cookie.
Has Payload Boolean The payload is only present if the cookie exists on the client.
Payload Length Optional VarInt Length of the following byte array.
Payload Optional Byte Array (5120) The data of the cookie, if any.

Debug Sample Subscription

Packet ID State Bound To Field Name Field Type Notes
0x13 Play Server Sample Type VarInt Enum The type of debug sample to subscribe to. Currently always 0 (TICK_TIME).