Difference between revisions of "Pre-release protocol"

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(→‎Respawn (0x09): Removed Client->Server)
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−
This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently 1.2.5) to the current pre-release (or weekly release).
+
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.
  
−
== New packets ==
+
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.
  
−
=== Map Chunk Bulk (0x38) ===
+
== Contents ==
  
−
To reduce the number of bytes this packet is used to send chunk columns together for better compression results. The packet contains up to 100 chunk columns (later this might be reduced to 50).
+
<div style="float:right;">__TOC__</div>
  
−
The data part is a zlib compressed byte array containing the chunk data. The meta data part specifies which chunks in which order the data part exists of.
+
=== Data types ===
  
−
To split this packet into chunks you need to uncompress the data array. Then you can iterate through the data part. Each part is 10240 * n + 256 bytes. n is the number of chunks in the current chunk column(this is the number of flags set in the primary bitmap). 10240 is the amount of bytes for each chunk without add bitmap, 256 bytes are used for biomes. The second short in the meta data part is not yet in use. It could specify if the chunk uses the add bitmap part, because it has very high block ids, but not in the current snapshot.  
+
No changes so far.
  
−
{| class="wikitable"
+
=== Packets ===
−
|- class="row0"
 
−
! class="col0" | Packet ID
 
−
! class="col1" | Field Name
 
−
! class="col2" | Field Type
 
−
! class="col3" | Example
 
−
! class="col4" | Notes
 
−
|- class="row1"
 
−
| class="col0 centeralign" rowspan=5 | 0x38
 
−
| class="col1 centeralign" | Chunk Column Count
 
−
| class="col2 centeralign" | short
 
−
| class="col3 centeralign" |
 
−
| class="col4" | The number of chunk columns in this packet
 
−
|- class="row2"
 
−
| class="col1 centeralign" | Chunk data size
 
−
| class="col2 centeralign" | int
 
−
| class="col3 centeralign" |
 
−
| class="col4" | the size of the data field
 
−
|- class="row3"
 
−
| class="col1 centeralign" | Data
 
−
| class="col2 centeralign" | byte array
 
−
| class="col3 centeralign" |
 
−
| class="col4" | compressed chunk data
 
−
|- class="row4"
 
−
| class="col1 centeralign" | meta information
 
−
| class="col2 centeralign" | chunk bulk meta information
 
−
| class="col3 centeralign" |
 
−
| class="col4 centeralign" | Chunk column count times the Meta information structure (See notes for details)
 
−
|- class="row5"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="4" | 7 + (Chunk data size) + 12 * (Chunk Column Count) bytes
 
−
|}
 
−
 
 
−
 
 
−
====Chunk Bulk Meta Information Structure====
 
  
 
{| class="wikitable"
 
{| class="wikitable"
−
|- class="row0"
+
! ID
−
! class="col1" | Field Name
+
! Packet name
−
! class="col2" | Field Type
+
!colspan="2"| Documentation
−
! class="col3" | Example
+
|-
−
! class="col4" | Notes
+
!colspan="4"| Handshake serverbound
−
|- class="row1"
+
{{PacketList|0x00|Handshake}}
−
| class="col1 centeralign" | Chunk Column X
+
|-
−
| class="col2 centeralign" | int
+
!colspan="4"| Login clientbound
−
| class="col3 centeralign" | 10
+
{{PacketList|0x01|Encryption Request}}
−
| class="col4" | The X coordinate of the specific chunk column
+
{{PacketList|0x05|Cookie Request (login)|rel=added}}
−
|- class="row2"
+
|-
−
| class="col1 centeralign" | Chunk Column Z
+
!colspan="4"| Login serverbound
−
| class="col2 centeralign" | int
+
{{PacketList|0x04|Cookie Response (login)|rel=added}}
−
| class="col3 centeralign" | 10
+
|-
−
| class="col4" | The Z coordinate of the specific chunk column
+
!colspan="4"| Configuration clientbound
−
|- class="row3"
+
{{PacketList|0x00|Cookie Request (configuration)|rel=added}}
−
| class="col1 centeralign" | Chunk Primary bitmap
+
{{PacketList|{{change|0x00|0x01}}|Clientbound Plugin Message (configuration)|pre=unchanged}}
−
| class="col2 centeralign" | short
+
{{PacketList|{{change|0x01|0x02}}|Disconnect (configuration)|pre=unchanged}}
−
| class="col3 centeralign" | 15
+
{{PacketList|{{change|0x02|0x03}}|Finish Configuration|pre=unchanged}}
−
| class="col4" | A bitmap which specifies which chunk is not empty in this chunk column
+
{{PacketList|{{change|0x03|0x04}}|Clientbound Keep Alive (configuration)|pre=unchanged}}
−
|- class="row4"
+
{{PacketList|{{change|0x04|0x05}}|Ping (configuration)|pre=unchanged}}
−
| class="col1 centeralign" | Chunk Add bitmap?
+
{{PacketList|0x06|Reset Chat|rel=added}}
−
| class="col2 centeralign" | short
+
{{PacketList|{{change|0x05|0x07}}|Registry Data}}
−
| class="col3 centeralign" | 0
+
{{PacketList|{{change|0x06|0x08}}|Remove Resource Pack (configuration)|pre=unchanged}}
−
| class="col4" | A bitmap which specifies which chunk need add information because of very high block ids. not yet used. needs verification
+
{{PacketList|{{change|0x07|0x09}}|Add Resource Pack (configuration)|pre=unchanged}}
−
|- class="row5"
+
{{PacketList|0x0A|Store Cookie (configuration)|rel=added}}
−
! class="col0" | Total Size:
+
{{PacketList|0x0B|Transfer (configuration)|rel=added}}
−
| class="col1 rightalign" colspan="3" | 12 bytes
+
{{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}}
 +
|}
  
−
=== Tab-complete (0xCB) ===
+
== New/modified data types ==
  
−
''Two-way''
+
No changes so far.
  
−
Sent C->S when the user presses [tab] while writing text. The payload contains all text behind the cursor.
+
== Entity Metadata ==
  
−
The server responds with an auto-completion of the last word sent to it. In the case of regular chat, this is a player username. Command names and parameters are also supported.
+
{{#vardefine: meta_prerelease | 1}}
  
−
In the event of more than one possible completion, the server responds with the options packed into the single string field, separated by a null character. Note that as strings are UTF-16, this is two bytes wide.
+
{{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
 +
|}
  
−
{| class="wikitable"
+
=== Living Entity ===
−
|- class="row0"
 
−
! class="col0" | Packet ID
 
−
! class="col1" | Field Name
 
−
! class="col2" | Field Type
 
−
! class="col3" | Example
 
−
! class="col4" | Notes
 
−
|- class="row1"
 
−
| class="col0 centeralign" | 0xCB
 
−
| class="col1 centeralign" | Text
 
−
| class="col2 centeralign" | string
 
−
| class="col3 centeralign" |
 
−
| class="col4" |
 
−
|- class="row3"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="4" | 3 bytes + length of string
 
−
|}
 
  
−
=== Locale and View Distance (0xCC) ===
+
TODO: This has changed to use the PARTICLES attribute
  
−
''Client to server''
+
=== Wolf ===
  
−
Sent when the player connects, or when settings are changed.
+
{{Metadata inherit|Wolf|inherits=Tameable Animal}}
  
 
{| class="wikitable"
 
{| class="wikitable"
−
|- class="row0"
+
! Index
−
! class="col0" | Packet ID
+
! Type
−
! class="col1" | Field Name
+
!style="width: 250px;" colspan="2"| Meaning
−
! class="col2" | Field Type
+
! Default
−
! class="col3" | Example
+
|- {{added}}
−
! class="col4" | Notes
+
| {{Metadata id|}}
−
|- class="row1"
+
| {{Metadata type|Wolf Variant}}
−
| class="col0 centeralign" rowspan="4" | 0xCC
+
|colspan="2"| Wolf Variant
−
| class="col1 centeralign" | Locale
+
| PALE
−
| class="col2 centeralign" | string
+
|-
−
| class="col3 centeralign" | en_GB
+
| {{Metadata id|}}
−
|- class="row2"
+
| {{Metadata type|Boolean}}
−
| class="col1 centeralign" | View distance
+
|colspan="2"| Is begging
−
| class="col2 centeralign" | byte
+
| false
−
| class="col3 centeralign" | 0
+
|-
−
| class="col4" | 0-3 for 'far', 'normal', 'short', 'tiny'.
+
| {{Metadata id|}}
−
|- class="row3"
+
| {{Metadata type|VarInt}}
−
| class="col1 centeralign" | Chat flags
+
|colspan="2"| Collar color (values are those {{Minecraft Wiki|Data_values#Dyes|used with dyes}})
−
| class="col2 centeralign" | byte
+
| 14 (Red)
−
| class="col3 centeralign" | 8
+
|-
−
| class="col4" | Chat settings. See notes below.
+
| {{Metadata id|}}
−
|- class="row4"
+
| {{Metadata type|VarInt}}
−
| class="col1 centeralign" | Difficulty
+
|colspan="2"| Anger time
−
| class="col2 centeralign" | byte
+
| 0
−
| class="col3 centeralign" | 0
+
|}
−
| class="col4 centeralign" | Client-side difficulty from options.txt
 
−
|- class="row5"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="4" | 8 bytes + length of string
 
−
|}
 
−
 
 
−
Chat flags has several values packed into one byte.
 
−
 
 
−
'''Chat Enabled:''' Bits 0-1. 00: Enabled.  01: Commands only.  10: Hidden.
 
  
−
'''Colors Enabled:''' Bit 3.  0: Disabled.  1: Enabled.
+
=== Armadillo ===
  
−
=== Client Statuses (0xCD) ===
+
{{Metadata inherit|Armadillo|inherits=Animal|start_at=17}}
 +
{| class="wikitable" {{added}}
 +
! Index
 +
! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Default
 +
|-
 +
| {{Metadata id|added}}
 +
| {{Metadata type|Armadillo State}}
 +
|colspan="2"| Armadillo State
 +
| IDLE
 +
|}
  
−
''Client to server''
+
== Block Actions ==
  
−
Sent when the client is ready to complete login and when the client is ready to respawn after death.
+
No changes so far.
  
−
{| class="wikitable"
+
== Inventories ==
−
|- class="row0"
 
−
! class="col0" | Packet ID
 
−
! class="col1" | Field Name
 
−
! class="col2" | Field Type
 
−
! class="col3" | Example
 
−
! class="col4" | Notes
 
−
|- class="row1"
 
−
| class="col0 centeralign" rowspan="1" | 0xCD
 
−
| class="col1 centeralign" | Payload
 
−
| class="col2 centeralign" | byte
 
−
| class="col3 centeralign" | 0
 
−
| class="col4" | Bit field. 0: Initial spawn, 1: Respawn after death
 
−
|- class="row2"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="5" | 2 bytes
 
−
|}
 
  
−
=== Encryption Key Response (0xFC) ===
+
No changes so far.
  
−
''Two-Way''
+
== Plugin Channels ==
  
−
See [[Protocol Encryption]] for information on this packet.
+
No changes so far.
  
−
{| class="wikitable"
+
== Handshake ==
−
|- class="row0"
 
−
! class="col0" | Packet ID
 
−
! class="col1" | Field Name
 
−
! class="col2" | Field Type
 
−
! class="col3" | Example
 
−
! class="col4" | Notes
 
−
|- class="row1"
 
−
| class="col0 centeralign" rowspan="4" | 0xFC
 
−
| class="col1 centeralign" | Shared secret length
 
−
| class="col2 centeralign" | short
 
−
| class="col3 centeralign" |
 
−
| class="col4 centeralign" |
 
−
|- class="row2"
 
−
| class="col1 centeralign" | Shared secret
 
−
| class="col2 centeralign" | byte array
 
−
| class="col3 centeralign" |
 
−
| class="col4 centeralign" |
 
−
|- class="row3"
 
−
| class="col1 centeralign" | Verify token length
 
−
| class="col2 centeralign" | short
 
−
| class="col3 centeralign" |
 
−
| class="col4 centeralign" | 
 
−
|- class="row4"
 
−
| class="col1 centeralign" | Verify token response
 
−
| class="col2 centeralign" | byte array
 
−
| class="col3 centeralign" |
 
−
| class="col4 centeralign" |
 
−
|- class="row5"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="4" | 5 bytes + length of shared secret + length of token
 
−
|}
 
  
−
=== Encryption Key Request (0xFD) ===
+
=== Serverbound ===
  
−
''Server to client''
+
==== Handshake ====
  
−
See [[Protocol Encryption]] for information on this packet.
+
This causes the server to switch into the target state.
  
 
{| class="wikitable"
 
{| class="wikitable"
−
|- class="row0"
+
! Packet ID
−
! class="col0" | Packet ID
+
! State
−
! class="col1" | Field Name
+
! Bound To
−
! class="col2" | Field Type
+
! Field Name
−
! class="col3" | Example
+
! Field Type
−
! class="col4" | Notes
+
! Notes
−
|- class="row1"
+
|-
−
| class="col0 centeralign" rowspan="5" | 0xFD
+
| rowspan="4"| 0x00
−
| class="col1 centeralign" | Server id
+
| rowspan="4"| Handshaking
−
| class="col2 centeralign" | string
+
| rowspan="4"| Server
−
| class="col3 centeralign" |
+
| Protocol Version
−
| class="col4 centeralign" |  
+
| [[#Definitions:varint|VarInt]]
−
|- class="row2"
+
| See [[protocol version numbers]] (currently 765 in Minecraft 1.20.4).
−
| class="col1 centeralign" | Public key length
+
|-
−
| class="col2 centeralign" | short
+
| Server Address
−
| class="col3 centeralign" |  
+
| [[#Definitions:string|String]] (255)
−
| class="col4 centeralign" |
+
| 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.
−
|- class="row3"
+
|-
−
| class="col1 centeralign" | Public key
+
| Server Port
−
| class="col2 centeralign" | byte array
+
| [[#Definitions:unsigned-short|Unsigned Short]]
−
| class="col3 centeralign" |
+
| Default is 25565. The Notchian server does not use this information.
−
| class="col4 centeralign" |
+
|-
−
|- class="row4"
+
| Next State
−
| class="col1 centeralign" | Verify token length
+
| [[#Definitions:varint|VarInt]] [[#Definitions:enum|Enum]]
−
| class="col2 centeralign" | short
+
| 1 for [[#Status|Status]], 2 for [[#Login|Login]]{{change||, 3 for [[#Login|Transfer]]}}.
−
| class="col3 centeralign" |  
+
|}
−
| class="col4 centeralign" |
 
−
|- class="row4"
 
−
| class="col1 centeralign" | Verify token
 
−
| class="col2 centeralign" | byte array
 
−
| class="col3 centeralign" |  
 
−
| class="col4 centeralign" |  
 
−
|- class="row5"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="4" | 7 bytes + length of string + length of key + length of token
 
−
|}
 
−
 
 
  
 +
== Status ==
  
 +
=== Clientbound ===
  
 +
No changes so far.
  
−
=== Named Sound Effect (0x3E) ===
+
=== Serverbound ===
  
−
''Server to client''
+
No changes so far.
  
−
Used to play a sound effect on the client.
+
== Login ==
  
−
{| class="wikitable"
+
=== Clientbound ===
−
|- class="row0"
 
−
! class="col0" | Packet ID
 
−
! class="col1" | Field Name
 
−
! class="col2" | Field Type
 
−
! class="col3" | Example
 
−
! class="col4" | Notes
 
−
|- class="row1"
 
−
| class="col0 centeralign" rowspan="6" | 0x3E
 
−
| class="col1 centeralign" | Sound name
 
−
| class="col2 centeralign" | string
 
−
| class="col3 centeralign" | step.grass
 
−
| class="col4 centeralign" | 250
 
−
|- class="row2"
 
−
| class="col1 centeralign" | Effect position X
 
−
| class="col2 centeralign" | int
 
−
| class="col3 centeralign" | 250
 
−
| class="col4 centeralign" | effect X multiplied by 8
 
−
|- class="row3"
 
−
| class="col1 centeralign" | Effect position Y
 
−
| class="col2 centeralign" | int
 
−
| class="col3 centeralign" | 250
 
−
| class="col4 centeralign" | effect Y multiplied with 8
 
−
|- class="row4"
 
−
| class="col1 centeralign" | Effect position Z
 
−
| class="col2 centeralign" | int
 
−
| class="col3 centeralign" | 250
 
−
| class="col4 centeralign" | effect Z multiplied with 8
 
−
|- class="row5"
 
−
| class="col1 centeralign" | Volume
 
−
| class="col2 centeralign" | float
 
−
| class="col3 centeralign" | 9
 
−
| class="col4 centeralign" | 1 is 100%, can be more
 
−
|- class="row6"
 
−
| class="col1 centeralign" | Pitch
 
−
| class="col2 centeralign" | byte
 
−
| class="col3 centeralign" | 1
 
−
| class="col4 centeralign" | 63 is 100%, can be more
 
−
|- class="row7"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="4" | 20 bytes + length of string
 
−
|}
 
  
−
=== Block Break Animation (0x37) ===
+
==== Encryption Request ====
  
 
{| class="wikitable"
 
{| class="wikitable"
−
|- class="row0"
+
! Packet ID
−
! class="col0" | Packet ID
+
! State
−
! class="col1" | Field Name
+
! Bound To
−
! class="col2" | Field Type
+
! Field Name
−
! class="col3" | Example
+
! Field Type
−
! class="col4" | Notes
+
! Notes
−
|- class="row1"
+
|-
−
| class="col0 centeralign" rowspan=5 | 0x37
+
| rowspan="6"| 0x01
−
| class="col1 centeralign" | EID?
+
| rowspan="6"| Login
−
| class="col2 centeralign" | int
+
| rowspan="6"| Client
−
| class="col3 centeralign" |
+
| Server ID
−
| class="col4" | Entity breaking the block?
+
| {{Type|String}} (20)
−
|- class="row2"
+
| Appears to be empty.
−
| class="col1 centeralign" | X
+
|-
−
| class="col2 centeralign" | int
+
| Public Key Length
−
| class="col3 centeralign" |  
+
| {{Type|VarInt}}
−
| class="col4" rowspan=3 | Block position
+
| Length of Public Key.
−
|- class="row2"
+
|-
−
| class="col1 centeralign" | Y
+
| Public Key
−
| class="col2 centeralign" | int
+
| {{Type|Byte Array}}
−
| class="col3 centeralign" |
+
| The server's public key, in bytes.
−
|- class="row2"
+
|-
−
| class="col1 centeralign" | Z
+
| Verify Token Length
−
| class="col2 centeralign" | int
+
| {{Type|VarInt}}
−
| class="col3 centeralign" |
+
| Length of Verify Token. Always 4 for Notchian servers.
−
|- class="row3"
+
|-
−
| class="col1 centeralign" | Unknown
+
| Verify Token
−
| class="col2 centeralign" | byte
+
| {{Type|Byte Array}}
−
| class="col3 centeralign" | 1
+
| A sequence of random bytes generated by the server.
−
| class="col4" | ?
+
|- {{added}}
−
|- class="row2"
+
| Should Authenticate
−
! class="col0" | Total Size:
+
| {{Type|Boolean}}
−
| class="col1 rightalign" colspan="4" | 4 bytes
+
|  
−
|}
+
|}
−
 
 
−
== Changed Data Type ==
 
−
 
 
−
=== Slot Data ===
 
  
−
Parsing or encoding of [[Slot Data]] no longer requires a list of all enchantable item IDs.  Every slot transmitted now includes a short that indicates the length of the NBT data.  As before, a length of -1 means there is no NBT data.
+
==== Cookie Request (login) ====
  
−
This change affects any packets with [[Slot Data]], including:
+
Requests a cookie that was previously stored.
−
* 0x0F (Player Block Placement)
 
−
* 0x10 (Held Item Change)
 
−
* 0x66 (Click Window)
 
−
* 0x67 (Set Slot)
 
−
* 0x68 (Set Window Items)
 
−
* 0x6B (Creative Inventory Action)
 
−
* 0x05 (Entity Equipment)
 
  
−
== Changed packets ==
+
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
! Notes
 +
|-
 +
| rowspan="1"| 0x05
 +
| rowspan="1"| Login
 +
| rowspan="1"| Client
 +
| colspan="2"| Key
 +
| colspan="2"| Identifier
 +
| The identifier of the cookie.
 +
|}
  
−
=== Login Request (0x01) ===
+
=== Serverbound ===
  
−
''Server to Client''
+
==== Cookie Response (login) ====
  
−
See [[Protocol Encryption]] for information on logging in.
+
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.
  
−
{| class="wikitable"
+
{| class="wikitable" {{added}}
−
|- class="row0"
+
! Packet ID
−
! class="col0" | Packet ID
+
! State
−
! class="col1" | Field Name
+
! Bound To
−
! class="col2" | Field Type
+
! colspan="2"| Field Name
−
! class="col3" | Example
+
! colspan="2"| Field Type
−
! class="col4" | Notes
+
! Notes
−
|- class="row1"
+
|-
−
| class="col0 centeralign" rowspan="7" | 0x01
+
| rowspan="4"| 0x04
−
| class="col1 centeralign" | Entity ID
+
| rowspan="4"| Login
−
| class="col2 centeralign" | int
+
| rowspan="4"| Server
−
| class="col3 centeralign" | <code>1298</code>
+
| colspan="2"| Key
−
| class="col4" | The Players Entity ID
+
| colspan="2"| Identifier
−
|- class="row2"
+
| The identifier of the cookie.
−
| class="col0 centeralign" | Level Type
+
|-
−
| class="col1 centeralign" | string
+
| colspan="2"| Has Payload
−
| class="col2 centeralign" | default
+
| colspan="2"| Boolean
−
| class="col3" | default or SUPERFLAT; level-type in server.properties
+
| The payload is only present if the cookie exists on the client.
−
|- class="row3"
+
|-
−
| class="col0 centeralign" | Server mode
+
| colspan="2"| Payload Length
−
| class="col1 centeralign" | byte
+
| colspan="2"| VarInt
−
| class="col2 centeralign" | <code>0</code>
+
| Length of the following byte array.
−
| class="col3" | 0 for survival, 1 for creative
+
|-
−
|- class="row4"
+
| colspan="2"| Payload
−
| class="col0 centeralign" | Dimension
+
| colspan="2"| Optional Byte Array (5120)
−
| class="col1 centeralign" | byte
+
| The data of the cookie, if any.
−
| class="col2 centeralign" | <code>0</code>
+
|}
−
| class="col3" | <code>-1</code>: The Nether, <code>0</code>: The Overworld, <code>1</code>: The End
 
−
|- class="row5"
 
−
| class="col0 centeralign" | Difficulty
 
−
| class="col1 centeralign" | byte
 
−
| class="col2 centeralign" | <code>1</code>
 
−
| class="col3" | <code>0</code> thru <code>3</code> for Peaceful, Easy, Normal, Hard
 
−
|- class="row6"
 
−
| class="col0 centeralign" | Not used
 
−
| class="col1 centeralign" | unsigned byte
 
−
| class="col2 centeralign" | <code>0</code>
 
−
| class="col3" | Only 0 observed from vanilla server, was previously world height
 
−
|- class="row7"
 
−
| class="col0 centeralign" | Max players
 
−
| class="col1 centeralign" | unsigned byte
 
−
| class="col2 centeralign" | <code>8</code>
 
−
| class="col3" | Used by the client to draw the player list
 
−
|- class="row8"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="4" | 12 bytes + length of strings
 
−
|}
 
  
−
=== Handshake (0x02) ===
+
== Configuration ==
  
−
''Client to server''
+
=== Clientbound ===
  
−
See [[Protocol Encryption]] for information on logging in.
+
==== Cookie Request (configuration) ====
  
−
{| class="wikitable"
+
Requests a cookie that was previously stored.
−
|- class="row0"
 
−
! class="col0" | Packet ID
 
−
! class="col1" | Field Name
 
−
! class="col2" | Field Type
 
−
! class="col3" | Example
 
−
! class="col4" | Notes
 
−
|- class="row1"
 
−
| class="col0 centeralign" rowspan="4" | 0x02
 
−
| class="col1 centeralign" | Protocol Version
 
−
| class="col2 centeralign" | byte
 
−
| class="col3 centeralign" | <code>38</code>
 
−
| class="col4" |
 
−
|- class="row2"
 
−
| class="col1 centeralign" | Username
 
−
| class="col2 centeralign" | string
 
−
| class="col3 centeralign" | <code>TkTech</code>
 
−
| class="col4" | The username of the player attempting to connect
 
−
|- class="row3"
 
−
| class="col1 centeralign" | Server Host
 
−
| class="col2 centeralign" | string
 
−
| class="col3 centeralign" | <code>localhost</code>
 
−
| class="col4" |
 
−
|- class="row4"
 
−
| class="col1 centeralign" | Server Port
 
−
| class="col2 centeralign" | int
 
−
| class="col3 centeralign" | <code>25565</code>
 
−
| class="col4" |
 
−
|- class="row5"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="4" | 10 bytes + length of strings
 
−
|}
 
  
−
=== Entity Equipment (0x05) ===
+
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
! Notes
 +
|-
 +
| rowspan="1"| 0x00
 +
| rowspan="1"| Configuration
 +
| rowspan="1"| Client
 +
| colspan="2"| Key
 +
| colspan="2"| Identifier
 +
| The identifier of the cookie.
 +
|}
  
−
''Server to Client''
+
==== Reset Chat ====
  
−
{| class="wikitable"
+
{| class="wikitable" {{added}}
−
|- class="row0"
+
! Packet ID
−
! class="col0" | Packet ID
+
! State
−
! class="col1" | Field Name
+
! Bound To
−
! class="col2" | Field Type
+
! Field Name
−
! class="col3" | Example
+
! Field Type
−
! class="col4" | Notes
+
! Notes
−
|- class="row1"
+
|-
−
| class="col0 centeralign" rowspan="3" | 0x05
+
| 0x06
−
| class="col1 centeralign" | Entity ID
+
| Configuration
−
| class="col2 centeralign" | int
+
| Client
−
| class="col3 centeralign" | 0x00010643
+
| colspan="3"| ''no fields''
−
| class="col4" | Named Entity ID
+
|}
−
|- class="row2"
 
−
| class="col0 centeralign" | Slot
 
−
| class="col1 centeralign" | short
 
−
| class="col2 centeralign" | 4
 
−
| class="col3" | Equipment slot: 0=held, 1-4=armor slot
 
−
|- class="row3"
 
−
| class="col0 centeralign" | Item
 
−
| class="col1 centeralign" | slot
 
−
| class="col2 centeralign" |
 
−
| class="col3" | Item in slot format
 
−
|- class="row5"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="4" | 11 bytes
 
−
|}
 
  
−
=== Respawn (0x09) ===
+
==== Registry Data ====
  
−
'''Server to Client'''
+
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>.}}
−
 
 
−
To change the player's dimension (overworld/nether/end), send them a respawn packet with the appropriate dimension, followed by prechunks/chunks for the new dimension, and finally a position and look packet.  You do not need to unload chunks, the client will do it automatically.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
−
|- class="row0"
+
! Packet ID
−
! class="col0" | Packet ID
+
! State
−
! class="col1" | Field Name
+
! Bound To
−
! class="col2" | Field Type
+
! colspan="2"| Field Name
−
! class="col3" | Example
+
! colspan="2"| Field Type
−
! class="col4" | Notes
+
! Notes
−
|- class="row1"
+
|-
−
| class="col0 centeralign" rowspan="5" | 0x09
+
| rowspan="6"| 0x07
−
| class="col1 centeralign" | Dimension
+
| rowspan="6"| Configuration
−
| class="col2 centeralign" | int
+
| rowspan="6"| Client
−
| class="col3 centeralign" | <code>1</code>
+
|{{removed}} colspan="2"| Registry Codec
−
| class="col4" | <code>-1</code>: The Nether, <code>0</code>: The Overworld, <code>1</code>: The End
+
|{{removed}} colspan="2"| {{Type|NBT}} (Compound)
−
|- class="row2"
+
|{{removed}}| See [[Registry Data]].
−
| class="col1 centeralign" | Difficulty
+
|- {{added}}
−
| class="col2 centeralign" | byte
+
| colspan="2"| Registry ID
−
| class="col3 centeralign" | <code>1</code>
+
| colspan="2"| Identifier
−
| class="col4" | <code>0</code> thru <code>3</code> for Peaceful, Easy, Normal, Hard. <code>1</code> is always sent c->s
+
|  
−
|- class="row3"
+
|- {{added}}
−
| class="col1 centeralign" | Creative mode
+
| colspan="2"| Entry Count
−
| class="col2 centeralign" | byte
+
| colspan="2"| VarInt
−
| class="col3 centeralign" | <code>1</code>
+
| Number of entries in the following array.
−
| class="col4" | <code>0</code> for survival, <code>1</code> for creative.
+
|- {{added}}
−
|- class="row4"
+
| rowspan="3"| Entries
−
| class="col1 centeralign" | World height
+
| Entry ID
−
| class="col2 centeralign" | short
+
| rowspan="3"| Array
−
| class="col3 centeralign" | <code>256</code>
+
| Identifier
−
| class="col4" | Defaults to <code>256</code>
+
|
−
|- class="row5"
+
|- {{added}}
−
| class="col1 centeralign" | Level Type
+
| Has Data
−
| class="col2 centeralign" | string
+
| Boolean
−
| class="col3 centeralign" | default
+
| Whether the entry has any data following.
−
| class="col4" | See [[#0x01|0x01 login]]
+
|- {{added}}
−
|- class="row6"
+
| Data
−
! class="col0" | Total Size:
+
| NBT Tag
−
| class="col1 rightalign" colspan="4" | 11 bytes + length of string
+
| Entry data. Only present if Has Data is true.
−
|}
+
|}
  
−
=== Player Block Placement (0x0F) ===
+
==== Store Cookie (configuration) ====
  
−
''Client to Server''
+
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"
+
{| class="wikitable" {{added}}
−
|- class="row0"
+
! Packet ID
−
! class="col0" | Packet ID
+
! State
−
! class="col1" | Field Name
+
! Bound To
−
! class="col2" | Field Type
+
! colspan="2"| Field Name
−
! class="col3" | Example
+
! colspan="2"| Field Type
−
! class="col4" | Notes
+
! Notes
−
|- class="row1"
+
|-
−
| class="col0 centeralign" rowspan="8" | 0x0F
+
| rowspan="2"| 0x0A
−
| class="col1 centeralign" | X
+
| rowspan="2"| Configuration
−
| class="col2 centeralign" | int
+
| rowspan="2"| Client
−
| class="col3 centeralign" | <code>32</code>
+
| colspan="2"| Key
−
| class="col4" | Block position
+
| colspan="2"| Identifier
−
|- class="row2"
+
| The identifier of the cookie.
−
| class="col0 centeralign" | Y
+
|-
−
| class="col1 centeralign" | unsigned byte
+
| colspan="2"| Payload
−
| class="col2 centeralign" | <code>64</code>
+
| colspan="2"| ByteArray(5120)
−
| class="col3" | Block position
+
| The data of the cookie.
−
|- class="row3"
+
|}
−
| class="col0 centeralign" | Z
 
−
| class="col1 centeralign" | int
 
−
| class="col2 centeralign" | <code>32</code>
 
−
| class="col3 leftalign" | Block position
 
−
|- class="row4"
 
−
| class="col0 centeralign" | Direction
 
−
| class="col1 centeralign" | byte
 
−
| class="col2 centeralign" | <code>3</code>
 
−
| class="col3" | The offset to use for block/item placement (see below)
 
−
|- class="row5"
 
−
| class="col0 centeralign" | Held item
 
−
| class="col1 centeralign" | [[Slot_Data|slot]]
 
−
| class="col2 centeralign" |
 
−
| class="col3" |
 
−
|- class="row6"
 
−
| class="col0 centeralign" | Cursor position X
 
−
| class="col1 centeralign" | byte
 
−
| class="col2 centeralign" | 0 - 16
 
−
| class="col3" | The position of the crosshair on the block
 
−
|- class="row7"
 
−
| class="col0 centeralign" | Cursor position Y
 
−
| class="col1 centeralign" | byte
 
−
| class="col2 centeralign" | 0 - 16
 
−
| class="col3" |
 
−
|- class="row8"
 
−
| class="col0 centeralign" | Cursor position Z
 
−
| class="col1 centeralign" | byte
 
−
| class="col2 centeralign" | 0 - 16
 
−
| class="col3" |
 
−
|- class="row9"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="4" | 11 bytes + slot data
 
−
|}
 
  
−
=== Spawn Named Entity (0x14) ===
+
==== Transfer (configuration) ====
  
−
''Server to Client''
+
Notifies the client that it should transfer to the given server. Cookies previously stored are preserved between server transfers.
  
−
{| class="wikitable"
+
{| class="wikitable" {{added}}
−
|- class="row0"
+
! Packet ID
−
! class="col0 centeralign" | Packet ID
+
! State
−
! class="col1 rightalign" | Field Name
+
! Bound To
−
! class="col2" | Field Type
+
! colspan="2"| Field Name
−
! class="col3" | Example
+
! colspan="2"| Field Type
−
! class="col4" | Notes
+
! Notes
−
|- class="row1"
+
|-
−
| class="col0 centeralign" rowspan="9" | 0x14
+
| rowspan="2"| 0x0B
−
| class="col1" | EID
+
| rowspan="2"| Configuration
−
| class="col2" | int
+
| rowspan="2"| Client
−
| class="col3" | <code>94453</code>
+
| colspan="2"| Host
−
| class="col4" | Player ID
+
| colspan="2"| String
−
|- class="row2"
+
| The hostname of IP of the server.
−
| class="col0" | Player Name
+
|-
−
| class="col1" | string
+
| colspan="2"| Port
−
| class="col2" | <code>Twdtwd</code>
+
| colspan="2"| VarInt
−
| class="col3" | Max length of 16
+
| The port of the server.
−
|- class="row3"
+
|}
−
| class="col0" | X
 
−
| class="col1" | int
 
−
| class="col2" | <code>784</code>
 
−
| class="col3" | Player X as Absolute Integer
 
−
|- class="row4"
 
−
| class="col0" | Y
 
−
| class="col1" | int
 
−
| class="col2" | <code>2131</code>
 
−
| class="col3" | Player Y as Absolute Integer
 
−
|- class="row5"
 
−
| class="col0" | Z
 
−
| class="col1" | int
 
−
| class="col2" | <code>-752</code>
 
−
| class="col3" | Player Z as Absolute Integer
 
−
|- class="row6"
 
−
| class="col0" | Yaw
 
−
| class="col1" | byte
 
−
| class="col2" | <code>0</code>
 
−
| class="col3" | Player rotation as a packed byte
 
−
|- class="row7"
 
−
| class="col0" | Pitch
 
−
| class="col1" | byte
 
−
| class="col2" | <code>0</code>
 
−
| class="col3" | Player rotation as a packed byte
 
−
|- class="row8"
 
−
| class="col0" | Current Item
 
−
| class="col1" | short
 
−
| class="col2" | <code>0</code>
 
−
| class="col3" | 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.
 
−
|- class="row9"
 
−
| class="col0" | Metadata
 
−
| class="col1" | Metadata
 
−
| class="col2" | <code>127</code>
 
−
| class="col3" |
 
−
|- class="row10"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="4" | 22 bytes + length of strings + metadata (at least 1)
 
−
|}
 
  
−
=== Spawn Object/Vehicle (0x17) ===
+
==== Clientbound Known Packs ====
 +
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
! Notes
 +
|-
 +
| rowspan="4"| 0x0E
 +
| rowspan="4"| Configuration
 +
| rowspan="4"| Client
 +
| colspan="2"| Known Pack Count
 +
| colspan="2"| VarInt
 +
| The number of known packs in the following array.
 +
|-
 +
| rowspan="3"| Known Packs
 +
| Namespace
 +
| rowspan="3"| Array
 +
| String
 +
|
 +
|-
 +
| ID
 +
| String
 +
|
 +
|-
 +
| Version
 +
| String
 +
|
 +
|}
  
−
''Server to Client''
+
=== Serverbound ===
  
−
Sent by the server when an Object/Vehicle is created. The throwers entity id is now used for fishing floats too.
+
==== Cookie Response (configuration) ====
  
−
{| class="wikitable"
+
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="row0"
 
−
! class="col0" | Packet ID
 
−
! class="col1" | Field Name
 
−
! class="col2" | Field Type
 
−
! class="col3" | Example
 
−
! class="col4" | Notes
 
−
|- class="row1"
 
−
| class="col0 centeralign" rowspan="9" | 0x17
 
−
| class="col1 centeralign" | EID
 
−
| class="col2 centeralign" | int
 
−
| class="col3 centeralign" | <code>62</code>
 
−
| class="col4" | Entity ID of the Object
 
−
|- class="row2"
 
−
| class="col0 centeralign" | Type
 
−
| class="col1 centeralign" | byte
 
−
| class="col2 centeralign" | <code>11</code>
 
−
| class="col3" | The type of object (see [[Entities#Objects]])
 
−
|- class="row3"
 
−
| class="col0 centeralign" | X
 
−
| class="col1 centeralign" | int
 
−
| class="col2 centeralign" | <code>16080</code>
 
−
| class="col3" | The Absolute Integer X Position of the object
 
−
|- class="row4"
 
−
| class="col0 centeralign" | Y
 
−
| class="col1 centeralign" | int
 
−
| class="col2 centeralign" | <code>2299</code>
 
−
| class="col3" | The Absolute Integer Y Position of the object
 
−
|- class="row5"
 
−
| class="col0 centeralign" | Z
 
−
| class="col1 centeralign" | int
 
−
| class="col2 centeralign" | <code>592</code>
 
−
| class="col3" | The Absolute Integer Z Position of the object
 
−
|- class="row6"
 
−
| class="col0 centeralign" | thrower's entity ID
 
−
| class="col1 centeralign" | int
 
−
| class="col2 centeralign" | <code>0</code>
 
−
| class="col3" | If this is bigger than 0, this is a entity trown by a other entity and the next 3 fields are sent.
 
−
|- class="row7"
 
−
| class="col0 centeralign" | Speed X
 
−
| class="col1 centeralign" | short
 
−
| class="col2 centeralign" | <code>0</code>
 
−
| class="col3" | Not sent if the thrower entity ID is 0. The speed of this entity along the X axis.
 
−
|- class="row5"
 
−
| class="col0 centeralign" | Speed Y
 
−
| class="col1 centeralign" | short
 
−
| class="col2 centeralign" | <code>0</code>
 
−
| class="col3" | Not sent if the thrower entity ID is 0. The speed of this entity along the Y axis.
 
−
|- class="row5"
 
−
| class="col0 centeralign" | Speed Z
 
−
| class="col1 centeralign" | short
 
−
| class="col2 centeralign" | <code>0</code>
 
−
| class="col3" | Not sent if the thrower entity ID is 0. The speed of this entity along the Z axis.
 
−
|- class="row6"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="4" | 22 or 28 bytes
 
−
|}
 
  
 +
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! colspan="2"| Field Name
 +
! 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.
 +
|}
  
−
{{anchor|0x18}}
+
==== Serverbound Known Packs ====
  
−
=== Spawn Mob (0x18) ===
+
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.
  
−
''Server to Client''
+
== Play ==
  
−
Sent by the server when a Mob Entity is Spawned
+
=== Clientbound ===
  
−
{| class="wikitable"
+
==== Cookie Request (play) ====
−
|- class="row0"
 
−
! class="col0" | Packet ID
 
−
! class="col1" | Field Name
 
−
! class="col2" | Field Type
 
−
! class="col3" | Example
 
−
! class="col4" | Notes
 
−
|- class="row1"
 
−
| class="col0 centeralign" rowspan="12" | 0x18
 
−
| class="col1 centeralign" | EID
 
−
| class="col2 centeralign" | int
 
−
| class="col3 centeralign" | <code>446</code>
 
−
| class="col4" | Entity ID
 
−
|- class="row2"
 
−
| class="col0 centeralign" | Type
 
−
| class="col1 centeralign" | byte
 
−
| class="col2 centeralign" | <code>91</code>
 
−
| class="col3" | The type of mob. See [[Entities#Mobs]]
 
−
|- class="row3"
 
−
| class="col0 centeralign" | X
 
−
| class="col1 centeralign" | int
 
−
| class="col2 centeralign" | <code>13366</code>
 
−
| class="col3" | The Absolute Integer X Position of the object
 
−
|- class="row4"
 
−
| class="col0 centeralign" | Y
 
−
| class="col1 centeralign" | int
 
−
| class="col2 centeralign" | <code>2176</code>
 
−
| class="col3" | The Absolute Integer Y Position of the object
 
−
|- class="row5"
 
−
| class="col0 centeralign" | Z
 
−
| class="col1 centeralign" | int
 
−
| class="col2 centeralign" | <code>1680</code>
 
−
| class="col3" | The Absolute Integer Z Position of the object
 
−
|- class="row6"
 
−
| class="col0 centeralign" | Yaw
 
−
| class="col1 centeralign" | byte
 
−
| class="col2 centeralign" | <code>-27</code>
 
−
| class="col3" | The yaw in steps of 2p/256
 
−
|- class="row7"
 
−
| class="col0 centeralign" | Pitch
 
−
| class="col1 centeralign" | byte
 
−
| class="col2 centeralign" | <code>0</code>
 
−
| class="col3" | The pitch in steps of 2p/256
 
−
|- class="row8"
 
−
| class="col0 centeralign" | Head Yaw
 
−
| class="col1 centeralign" | byte
 
−
| class="col2 centeralign" |
 
−
| class="col3" | Head yaw in steps of 2p/256
 
−
|- class="row9"
 
−
| class="col0 centeralign" | Velocity Z
 
−
| class="col1 centeralign" | short
 
−
| class="col2 centeralign" | <code>0</code>
 
−
| class="col3" |
 
−
|- class="row10"
 
−
| class="col0 centeralign" | Velocity X
 
−
| class="col1 centeralign" | short
 
−
| class="col2 centeralign" | <code>0</code>
 
−
| class="col3" |
 
−
|- class="row11"
 
−
| class="col0 centeralign" | Velocity Y
 
−
| class="col1 centeralign" | short
 
−
| class="col2 centeralign" | <code>0</code>
 
−
| class="col3" |
 
−
|- class="row12"
 
−
| class="col0 centeralign" | Metadata
 
−
| class="col1 centeralign" | Metadata
 
−
| class="col2 centeralign" | <code>127</code>
 
−
| class="col3" | Varies by mob, see [[Entities]]
 
−
|- class="row13"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="4" | 27 bytes + Metadata (at least 1)
 
−
|}
 
  
 +
Requests a cookie that was previously stored.
  
−
{{anchor|0x19}}
+
{| 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.
 +
|}
  
−
=== Destroy Entity (0x1D) ===
+
==== Debug Sample ====
  
−
''Server to Client''
+
{| 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).
 +
|}
  
−
Sent by the server when an list of Entities is to be destroyed on the client.
+
==== Login (play) ====
  
 
{| class="wikitable"
 
{| class="wikitable"
−
|- class="row0"
+
! Packet ID
−
! class="col0" | Packet ID
+
! State
−
! class="col1" | Field Name
+
! Bound To
−
! class="col2" | Field Type
+
! Field Name
−
! class="col3" | Example
+
! Field Type
−
! class="col4" | Notes
+
! Notes
−
|- class="row1"
+
|-
−
| class="col0 " rowspan="2" | 0x1D
+
| rowspan="22"| 0x2B
−
| class="col1 centeralign" | Entity Count
+
| rowspan="22"| Play
−
| class="col2 centeralign" | byte
+
| rowspan="22"| Client
−
| class="col3 centeralign" | <code>3</code>
+
| Entity ID
−
| class="col4 centeralign" | The amount of entities which should be destroyed
+
| {{Type|Int}}
−
|- class="row21"
+
| The player's Entity ID (EID).
−
| class="col1 centeralign" | Entity IDs
+
|-
−
| class="col2 centeralign" | array of int
+
| Is hardcore
−
| class="col3 centeralign" | <code>452, 546, 123</code>
+
| {{Type|Boolean}}
−
| class="col4 centeralign" | The list of entity ids which should be destroyed
+
|
−
|- class="row32"
+
|-
−
! class="col0" | Total Size:
+
| Dimension Count
−
| class="col1 rightalign" colspan="4" | 2 + (entity count * 4) bytes
+
| {{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}}
 +
|
 +
|}
  
 +
==== Respawn ====
  
−
{{anchor|0x1E}}
+
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
| rowspan="12"| 0x47
 +
| rowspan="12"| Play
 +
| rowspan="12"| Client
 +
| Dimension Type
 +
| {{change|Identifier|VarInt}}
 +
| The ID of the type of dimension in the <code>minecraft:dimension_type</code> registry, defined by the [[Protocol#Registry_Data|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.
 +
|-
 +
| 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.
 +
|}
  
−
=== Chunk Data (0x33) ===
+
==== Store Cookie (play) ====
  
−
''Server to Client''
+
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.
  
−
See also: [[Map Format]]
+
{| 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.
 +
|}
  
−
Chunks are sent a column at a time, with some sections optionally missing from each packet (those consisting only of air).
+
==== Transfer (play) ====
  
−
{| class="wikitable"
+
Notifies the client that it should transfer to the given server. Cookies previously stored are preserved between server transfers.
−
|- class="row0"
 
−
! class="col0" | Packet ID
 
−
! class="col1" | Field Name
 
−
! class="col2" | Field Type
 
−
! class="col3" | Example
 
−
! class="col4" | Notes
 
−
|- class="row1"
 
−
| class="col0 centeralign" rowspan="7" | 0x33
 
−
| class="col1 centeralign" | X
 
−
| class="col2 centeralign" | int
 
−
| class="col3 centeralign" |
 
−
| class="col4" | Chunk X Coordinate (*16 to get true X)
 
−
|- class="row2"
 
−
| class="col0 centeralign" | Z
 
−
| class="col1 centeralign" | int
 
−
| class="col2 centeralign" |
 
−
| class="col3" | Chunk Z Coordinate (*16 to get true Z)
 
−
|- class="row3"
 
−
| class="col0 centeralign" | Ground-up continuous
 
−
| class="col1 centeralign" | boolean
 
−
| class="col2 centeralign" |
 
−
| class="col3" | 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.
 
−
|- class="row4"
 
−
| class="col0 centeralign" | Primary bit map
 
−
| class="col1 centeralign" | unsigned short
 
−
| class="col2 centeralign" | 15
 
−
| class="col3" | Bitmask with 1 for every 16x16x16 section which data follows in the compressed data.
 
−
|- class="row5"
 
−
| class="col0 centeralign" | Add bit map
 
−
| class="col1 centeralign" | unsigned short
 
−
| class="col2 centeralign" | 0
 
−
| class="col3" | Same as above, but this is used exclusively for the 'add' portion of the payload
 
−
|- class="row6"
 
−
| class="col0 centeralign" | Compressed size
 
−
| class="col1 centeralign" | int
 
−
| class="col2 centeralign" |
 
−
| class="col3" | Size of compressed chunk data.
 
−
|- class="row78"
 
−
| class="col0 centeralign" | Compressed data
 
−
| class="col1 centeralign" | unsigned byte array
 
−
| class="col2 centeralign" | <code>…</code>
 
−
| class="col3" | The chunk data is compressed using ZLib Deflate function.
 
−
|- class="row8"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="4" | 22 bytes + Compressed chunk size
 
−
|}
 
  
 +
{| 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.
 +
|}
  
−
=== Block Change (0x35) ===
+
==== Update Attributes ====
  
−
''Server to Client''
+
Sets {{Minecraft Wiki|Attribute|attributes}} on the given entity.
  
 
{| class="wikitable"
 
{| class="wikitable"
−
|- class="row0"
+
! Packet ID
−
! class="col0" | Packet ID
+
! State
−
! class="col1" | Field Name
+
! Bound To
−
! class="col2" | Field Type
+
! colspan="2"| Field Name
−
! class="col3" | Example
+
! colspan="2"| Field Type
−
! class="col4" | Notes
+
! Notes
−
|- class="row1"
+
|-
−
| class="col0 centeralign" rowspan="5" | 0x35
+
| rowspan="6"| 0x71
−
| class="col1 centeralign" | X
+
| rowspan="6"| Play
−
| class="col2 centeralign" | int
+
| rowspan="6"| Client
−
| class="col3 centeralign" | <code>502</code>
+
| colspan="2"| Entity ID
−
| class="col4" | Block X Coordinate
+
| colspan="2"| VarInt
−
|- class="row2"
+
|
−
| class="col0 centeralign" | Y
+
|-
−
| class="col1 centeralign" | byte
+
| colspan="2"| Number Of Properties
−
| class="col2 centeralign" | <code>71</code>
+
| colspan="2"| VarInt
−
| class="col3" | Block Y Coordinate
+
| Number of elements in the following array.
−
|- class="row3"
+
|-
−
| class="col0 centeralign" | Z
+
| rowspan="4"| Property
−
| class="col1 centeralign" | int
+
| {{change|Key|Id}}
−
| class="col2 centeralign" | <code>18</code>
+
| rowspan="4"| Array
−
| class="col3" | Block Z Coordinate
+
| {{change|Identifier|VarInt Enum}}
−
|- class="row4"
+
| See below.
−
| class="col0 centeralign" | Block Type
+
|-
−
| class="col1 centeralign" | short
+
| Value
−
| class="col2 centeralign" | <code>78</code>
+
| Double
−
| class="col3" | The new block type for the block
+
| See below.
−
|- class="row5"
+
|-
−
| class="col0 centeralign" | Block Metadata
+
| Number Of Modifiers
−
| class="col1 centeralign" | byte
+
| VarInt
−
| class="col2 centeralign" | <code>0</code>
+
| Number of elements in the following array.
−
| class="col3" | The new Metadata for the block
+
|-
−
|- class="row6"
+
| Modifiers
−
! class="col0" | Total Size:
+
| Array of Modifier Data
−
| class="col1 rightalign" colspan="4" | 13 bytes
+
| See {{Minecraft Wiki|Attribute#Modifiers}}. Modifier Data defined below.
−
|}
+
|}
  
−
=== Block Action (0x36) ===
+
Known Key values (see also {{Minecraft Wiki|Attribute#Modifiers}}):
  
−
''Server to Client''
+
These changed between 24w03b and 24w13a, TODO: Update this
−
 
 
−
This packet is used for a number of things:
 
−
* <div class="li">Chests opening and closing
 
−
* Pistons pushing and pulling
 
−
* Note blocks playing
 
  
 
{| class="wikitable"
 
{| class="wikitable"
−
|- class="row0"
+
|-
−
! class="col0" | Packet ID
+
! Id
−
! class="col1" | Field Name
+
! Key
−
! class="col2" | Field Type
+
! Default
−
! class="col3" | Example
+
! Min
−
! class="col4" | Notes
+
! Max
−
|- class="row1"
+
! Label
−
| class="col0 centeralign" rowspan="6" | 0x36
+
|-
−
| class="col1 centeralign" | X
+
| 0
−
| class="col2 centeralign" | int
+
| generic.armor
−
| class="col3 centeralign" | <code>502</code>
+
| 0.0
−
| class="col4" | Block X Coordinate
+
| 0.0
−
|- class="row2"
+
| 30.0
−
| class="col0 centeralign" | Y
+
| Armor.
−
| class="col1 centeralign" | short
+
|-
−
| class="col2 centeralign" | <code>71</code>
+
| 1
−
| class="col3" | Block Y Coordinate
+
| generic.armor_toughness
−
|- class="row3"
+
| 0.0
−
| class="col0 centeralign" | Z
+
| 0.0
−
| class="col1 centeralign" | int
+
| 20.0
−
| class="col2 centeralign" | <code>18</code>
+
| Armor Toughness.
−
| class="col3" | Block Z Coordinate
+
|-
−
|- class="row4"
+
| 2
−
| class="col0 centeralign" | Byte 1
+
| generic.attack_damage
−
| class="col1 centeralign" | byte
+
| 2.0
−
| class="col2 centeralign" | <code>3</code>
+
| 0.0
−
| class="col3" | Varies depending on block - see below
+
| 2048.0
−
|- class="row5"
+
| Attack Damage.
−
| class="col0 centeralign" | Byte 2
+
|-
−
| class="col1 centeralign" | byte
+
| 3
−
| class="col2 centeralign" | <code>17</code>
+
| generic.attack_knockback
−
| class="col3" | Varies depending on block - see below
+
| 0.0
−
|- class="row6"
+
| 0.0
−
| class="col0 centeralign" | Block ID
+
| 5.0
−
| class="col1 centeralign" | byte
+
| Attack Knockback.
−
| class="col2 centeralign" | <code>29</code>
+
|-
−
| class="col3" | The block id this action is set for
+
| 4
−
|- class="row7"
+
| generic.attack_speed
−
! class="col0" | Total Size:
+
| 4.0
−
| class="col1 rightalign" colspan="4" | 13 bytes
+
| 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.
 +
|}
  
−
See Also: [[Block Actions]]
+
''Modifier Data'' structure:
−
 
 
−
=== Update Tile Entity (0x84) ===
 
−
 
 
−
''Server to Client''
 
−
 
 
−
Essentially a block update on a tile entity.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
−
|- class="row0"
+
|-
−
! class="col0" | Packet ID
+
! Field Name
−
! class="col1" | Field Name
+
! Field Type
−
! class="col2" | Field Type
+
! Notes
−
! class="col3" | Example
+
|-
−
! class="col4" | Notes
+
| UUID
−
|- class="row1"
+
| UUID
−
| class="col0 centeralign" rowspan="6" | 0x84
+
|
−
| class="col1 centeralign" | X
+
|-
−
| class="col2 centeralign" | int
+
| Amount
−
| class="col3 centeralign" |
+
| Double
−
| class="col4" |  
+
| May be positive or negative.
−
|- class="row2"
+
|-
−
| class="col0 centeralign" | Y
+
| Operation
−
| class="col1 centeralign" | short
+
| Byte
−
| class="col2 centeralign" |
+
| See below.
−
| class="col3" |
+
|}
−
|- class="row3"
 
−
| class="col0 centeralign" | Z
 
−
| class="col1 centeralign" | int
 
−
| class="col2 centeralign" |
 
−
| class="col3" |
 
−
|- class="row4"
 
−
| class="col0 centeralign" | Action
 
−
| class="col1 centeralign" | byte
 
−
| class="col2 centeralign" |
 
−
| class="col3" | The type of update to perform
 
−
|- class="row5"
 
−
| class="col0 centeralign" | Data length
 
−
| class="col1 centeralign" | Short
 
−
| class="col2 centeralign" |
 
−
| class="col3" | Varies
 
−
|- class="row6"
 
−
| class="col0 centeralign" | NBT Data
 
−
| class="col1 centeralign" | Byte Array - Present if data length > 0
 
−
| class="col2 centeralign" |
 
−
| class="col3" | Varies
 
−
|- class="row7"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="4" | 12 + itemstack bytes
 
−
|}
 
  
−
'''Actions'''
+
The operation controls how the base value of the modifier is changed.
  
−
* '''1''': Set mob displayed inside a mob spawner. Custom 1 contains the [[Entities#Mobs|mob type]]
+
* 0: Add/subtract amount
 +
* 1: Add/subtract amount percent of the current value
 +
* 2: Multiply by amount percent
  
−
=== Explosion (0x3C) ===
+
All of the 0's are applied first, and then the 1's, and then the 2's.
  
−
''Server to Client''
+
==== Entity Effect ====
−
 
 
−
Sent when an explosion occurs (creepers, TNT, and ghast fireballs).
 
  
 
{| class="wikitable"
 
{| class="wikitable"
−
|- class="row0"
+
! Packet ID
−
! class="col0" | Packet ID
+
! State
−
! class="col1" | Field Name
+
! Bound To
−
! class="col2" | Field Type
+
! Field Name
−
! class="col3" | Example
+
! Field Type
−
! class="col4" | Notes
+
! Notes
−
|- class="row1"
+
|-
−
| class="col0 centeralign" rowspan=9 | 0x3C
+
| rowspan="7"| 0x72
−
| class="col1 centeralign" | X
+
| rowspan="7"| Play
−
| class="col2 centeralign" | double
+
| rowspan="7"| Client
−
| class="col3 centeralign" |  
+
| Entity ID
−
| class="col4" |
+
| VarInt
−
|- class="row1"
+
|
−
| class="col1 centeralign" | Y
+
|-
−
| class="col2 centeralign" | double
+
| Effect ID
−
| class="col3 centeralign" |
+
| VarInt
−
| class="col4" |  
+
| See {{Minecraft Wiki|Status effect#Effect list|this table}}.
−
|- class="row1"
+
|-
−
| class="col1 centeralign" | Z
+
| Amplifier
−
| class="col2 centeralign" | double
+
| Byte
−
| class="col3 centeralign" |  
+
| Notchian client displays effect level as Amplifier + 1.
−
| class="col4" |  
+
|-
−
|- class="row1"
+
| Duration
−
| class="col1 centeralign" | Radius
+
| VarInt
−
| class="col2 centeralign" | float
+
| Duration in ticks. (-1 for infinite)
−
| class="col3 centeralign" | 3.0
+
|-
−
| class="col4" | Currently unused in the client
+
| Flags
−
|- class="row2"
+
| Byte
−
| class="col1 centeralign" | Record count
+
| Bit field, see below.
−
| class="col2 centeralign" | int
+
|- {{removed}}
−
| class="col3 centeralign" |
+
| Has Factor Data
−
| class="col4" | This is the count, not the size. The size is 3 times this value.
+
| Boolean
−
|- class="row3"
+
| Used in DARKNESS effect
−
| class="col1 centeralign" | Records
+
|- {{removed}}
−
| class="col2 centeralign" | (byte, byte, byte) × count
+
| Factor Codec
−
| class="col3 centeralign" |
+
| NBT Tag
−
| class="col4" | Each record is 3 bytes, which seem to be XYZ offsets of affected blocks.
+
| See below
−
|- class="row4"
+
|}
−
| class="col1 centeralign" | Unknown
 
−
| class="col2 centeralign" | float
 
−
| class="col3 centeralign" |
 
−
| class="col4" |
 
−
|- class="row5"
 
−
| class="col1 centeralign" | Unknown
 
−
| class="col2 centeralign" | float
 
−
| class="col3 centeralign" |
 
−
| class="col4" |
 
−
|- class="row6"
 
−
| class="col1 centeralign" | Unknown
 
−
| class="col2 centeralign" | float
 
−
| class="col3 centeralign" |
 
−
| class="col4" |
 
−
|- class="row7"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="4" | 45 bytes + 3*(Record count) bytes
 
−
|}
 
  
−
=== Player Abilities (0xCA) ===
+
{{Need Info|What exact effect does the blend bit flag have on the client? What happens if it is used on effects besides DARKNESS?}}
−
This packet has now been compressed into 3 bytes. The latter 2 bytes are used to indicate the walking and flying sppeds respectively, while the first byte is used to determine the value of 4 booleans.
 
−
 
−
These booleans are whether damage is disabled (god mode), whether the player is flying, whether the player can fly, and whether the player is in creative mode.
 
−
 
−
To get the values of these booleans, simply AND (&) the byte with 1,2,4 and 8 respectively, to get the 0 or 1 bitwise value. To set them OR (|) them with their repspective masks.
 
−
{| class="wikitable"
 
−
|- class="row0"
 
−
! class="col0" | Packet ID
 
−
! class="col1" | Field Name
 
−
! class="col2" | Field Type
 
−
! class="col3" | Example
 
−
! class="col4" | Notes
 
−
|- class="row1"
 
−
| class="col0 centeralign" rowspan=4 | 0xCA
 
−
| class="col1 centeralign" | Flags
 
−
| class="col2 centeralign" | byte
 
−
| class="col3 centeralign" | 5
 
−
| class="col4" |
 
−
|- class="row2"
 
−
| class="col1 centeralign" | Flying speed
 
−
| class="col2 centeralign" | byte
 
−
| class="col3 centeralign" | 12
 
−
| class="col4" |
 
−
|- class="row3"
 
−
| class="col1 centeralign" | Walking speed
 
−
| class="col2 centeralign" | byte
 
−
| class="col3 centeralign" | 25
 
−
| class="col4" |
 
−
|- class="row2"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="4" | 4 bytes
 
−
|}
 
  
−
== Removed packets ==
+
Within flags:
  
−
=== Chunk Allocation Packet (0x32) ===
+
* 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.
−
The chunk Allocation Packet is not longer in use. Memory will automatically allocated with a incoming Map Chunk packet. To deallocate memory you need to send a MapChunk packet, which only contains biome data for plains(all biome bytes set to 1). So the Add and Primary bitmap must set to 0, and Ground-up continuous to true. Because the payload of this packet is compressed and static you can use a hardcoded value for it, so you don't need to compress it each time.
+
* 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.}}
  
−
This is the payload which is used in the Compressed Data part to deallocate a chunk column:
+
{{change|Factor Data|}}
 +
{| class="wikitable" {{removed}}
 +
!Name
 +
!Type
 +
!style="width: 250px;" colspan="2"| 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
 +
|}
  
−
0x78, 0x9C, 0x63, 0x64, 0x1C, 0xD9, 0x00, 0x00, 0x81, 0x80, 0x01, 0x01
+
=== Serverbound ===
  
−
== Protocol History ==
+
==== Chat Command ====
  
−
=== 2012-07-24 ===
+
{| class="wikitable"
−
* 12w30c
+
! Packet ID
−
* Protocol version 39
+
! State
−
* Changed packets 0x84
+
! Bound To
−
 
+
! colspan="2"| Field Name
−
=== 2012-07-23 ===
+
! colspan="2"| Field Type
−
* 12w30a
+
! Notes
−
* Protocol version is still 38
+
|-
−
* Changed packets 0x14 and 0x35
+
| 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"|
 +
|}
  
−
=== 2012-07-05 ===
 
−
* 12w27a
 
−
* Protocol version is now 38
 
−
* Added packet 0x38
 
  
−
=== 2012-06-21 ===
+
==== Signed Chat Command ====
−
* 12w25a
 
−
* Packet 0xFC and 0xFD include a 4 byte long byte array. This is hashed with the public RSA key and sent back. See [[Protocol Encryption]] for further info.
 
−
* Packet 0x3E changed to include float rather than byte.
 
  
−
=== 2012-06-14 ===
+
{| class="wikitable" {{added}}
−
* 12w24a
+
! Packet ID
−
* Protocol version is now 36
+
! State
−
* Changed Packet 0x01(Login Request), only used as Login Reply
+
! Bound To
−
* New Packet 0xCD used for Login Request and Respawn (1 byte payload)
+
! colspan="2"| Field Name
−
* All items (except the empty hand) now send enchantment data
+
! colspan="2"| Field Type
 +
! Notes
 +
|-
 +
| rowspan="8"| 0x05
 +
| rowspan="8"| Play
 +
| rowspan="8"| Server
 +
| colspan="2"| Command
 +
| colspan="2"| String(256)
 +
| The command typed by the client.
 +
|-
 +
| colspan="2"| Timestamp
 +
| colspan="2"| Long
 +
| The timestamp that the command was executed. Milliseconds since the Unix epoch.
 +
|-
 +
| colspan="2"| Salt
 +
| colspan="2"| Long
 +
| 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)
 +
|
 +
|}
  
−
=== 2012-06-07 ===
+
==== Cookie Response (play) ====
−
* 12w23b
 
−
* Protocol version is now 35
 
−
* Change packet: Player Block Placement
 
−
* New Packet: Block breaking animation
 
  
−
=== 2012-05-24 ===
+
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.
−
* 12w21a
 
−
* No packet changes but the algorithm was changed to AES128 with the shared key as the IV, will be described in [[Protocol Encryption]]
 
  
−
=== 2012-05-10 ===
+
{| class="wikitable" {{added}}
−
* 12w19a
+
! Packet ID
−
* No packet changes, but an other encryption algorythm is used, described in [[Protocol Encryption]]
+
! State
−
* The items which are not enchantable in 12w18a are now readded
+
! Bound To
−
* Fishing floats, spawned by a 0x17 packet do now use the extra fields
+
! colspan="2"| Field Name
 +
! 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.
 +
|}
  
−
=== 2012-05-03 ===
+
==== Debug Sample Subscription ====
−
* 12w18a
 
−
* Protocol version is now 32
 
−
* New packet: 0x3D Name Sound Effect
 
−
* Changed packet: 0x01 Login Request
 
−
* Changed packet: 0x02 Handshake
 
−
* Changed packet: 0xCA Player Abilities
 
−
* Changed packet: 0xCC Locale and View Distance
 
−
* Changed packet: 0x09 Respawn
 
−
* Removed packet: 0x32 Map Column Allocation
 
−
* This items are not enchantable in this version: 0x103, 0x105, 0x15A, 0x167, 0x10C, 0x10D, 0x10E, 0x10F, 0x122, 0x110, 0x111, 0x112, 0x113, 0x123, 0x10B, 0x100, 0x101, 0x102, 0x124, 0x114, 0x115, 0x116, 0x117, 0x125, 0x11B, 0x11C, 0x11D, 0x11E, 0x126
 
  
−
=== 2012-04-26 ===
+
{| class="wikitable" {{added}}
−
* 12w17a
+
! Packet ID
−
* Protocol version is now 31
+
! State
−
* RC4 based encryption, described in [[Protocol Encryption]]
+
! Bound To
−
* Changed packet: 0x01 Login Request
+
! Field Name
−
* Changed packet: 0x02 Handshake
+
! Field Type
−
* Changed packet: 0xCC Locale and View Distance
+
! Notes
−
* Changed packet: 0xCA Player Abilities
+
|-
−
* New packet: 0xFC Encryption Key Response
+
| 0x13
−
* New packet: 0xFD Encryption Key Request
+
| Play
−
* New Item: Book & Quills (0x182) is enchantable
+
| Server
−
* New Item: Written Book (0x183) is enchantable
+
| Sample Type
 +
| VarInt Enum
 +
| The type of debug sample to subscribe to. Currently always 0 (TICK_TIME).
 +
|}
  
−
=== 2012-04-19 ===
+
[[Category:Minecraft Modern]]
−
* 12w16a
 
−
* Protocol version is now 30
 
−
* New packet: 0xCB Tab-complete
 
−
* New packet: 0xCC Locale and View Distance
 

Latest revision as of 22:19, 9 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

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).
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