Difference between revisions of "Pre-release protocol"

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(→‎Login Request (0x01): Removed Client->Server)
(→‎Entity Metadata: Merge changes from stable docs to incorporate new metadata type templates. Fix my earlier mistake on Pose in the process.)
 
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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|24w03b, protocol {{Snapshot PVN|1073741996}}]]). 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="row0"
 
! class="col1" | Field Name
 
! class="col2" | Field Type
 
! class="col3" | Example
 
! class="col4" | Notes
 
|- class="row1"
 
| class="col1 centeralign" | Chunk Column X
 
| class="col2 centeralign" | int
 
| class="col3 centeralign" | 10
 
| class="col4" | The X coordinate of the specific chunk column
 
|- class="row2"
 
| class="col1 centeralign" | Chunk Column Z
 
| class="col2 centeralign" | int
 
| class="col3 centeralign" | 10
 
| class="col4" | The Z coordinate of the specific chunk column
 
|- class="row3"
 
| class="col1 centeralign" | Chunk Primary bitmap
 
| class="col2 centeralign" | short
 
| class="col3 centeralign" | 15
 
| class="col4" | A bitmap which specifies which chunk is not empty in this chunk column
 
|- class="row4"
 
| class="col1 centeralign" | Chunk Add bitmap?
 
| class="col2 centeralign" | short
 
| class="col3 centeralign" | 0
 
| class="col4" | A bitmap which specifies which chunk need add information because of very high block ids. not yet used. needs verification
 
|- class="row5"
 
! class="col0" | Total Size:
 
| class="col1 rightalign" colspan="3" | 12 bytes
 
|}
 
 
 
 
 
=== Tab-complete (0xCB) ===
 
 
 
''Two-way''
 
 
 
Sent C->S when the user presses [tab] while writing text. The payload contains all text behind the cursor.
 
 
 
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.
 
 
 
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.
 
 
 
{| 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" | 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) ===
 
 
 
''Client to server''
 
 
 
Sent when the player connects, or when settings are changed.
 
 
 
{| 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" | 0xCC
 
| class="col1 centeralign" | Locale
 
| class="col2 centeralign" | string
 
| class="col3 centeralign" | en_GB
 
|- class="row2"
 
| class="col1 centeralign" | View distance
 
| class="col2 centeralign" | byte
 
| class="col3 centeralign" | 0
 
| class="col4" | 0-3 for 'far', 'normal', 'short', 'tiny'.
 
|- class="row3"
 
| class="col1 centeralign" | Chat flags
 
| class="col2 centeralign" | byte
 
| class="col3 centeralign" | 8
 
| class="col4" | Chat settings. See notes below.
 
|- class="row4"
 
| class="col1 centeralign" | Difficulty
 
| class="col2 centeralign" | byte
 
| 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.
 
 
 
=== Client Statuses (0xCD) ===
 
 
 
''Client to server''
 
 
 
Sent when the client is ready to complete login and when the client is ready to respawn after death.
 
 
 
{| 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="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) ===
 
 
 
''Two-Way''
 
 
 
See [[Protocol Encryption]] for information on this packet.
 
 
 
{| 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" | 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) ===
 
 
 
''Server to client''
 
 
 
See [[Protocol Encryption]] for information on this packet.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
|- class="row0"
+
! ID
! class="col0" | Packet ID
+
! Packet name
! class="col1" | Field Name
+
!colspan="2"| Documentation
! class="col2" | Field Type
+
|-
! class="col3" | Example
+
!colspan="4"| Handshake serverbound
! class="col4" | Notes
+
{{PacketList|0x00|Handshake}}
|- class="row1"
+
|-
| class="col0 centeralign" rowspan="5" | 0xFD
+
!colspan="4"| Login clientbound
| class="col1 centeralign" | Server id
+
{{PacketList|0x05|Cookie Request (login)|rel=added}}
| class="col2 centeralign" | string
+
|-
| class="col3 centeralign" |  
+
!colspan="4"| Login serverbound
| class="col4 centeralign" |  
+
{{PacketList|0x04|Cookie Response (login)|rel=added}}
|- class="row2"
+
|-
| class="col1 centeralign" | Public key length
+
!colspan="4"| Configuration clientbound
| class="col2 centeralign" | short
+
{{PacketList|0x00|Cookie Request (configuration)|rel=added}}
| class="col3 centeralign" |  
+
{{PacketList|{{change|0x00|0x01}}|Clientbound Plugin Message (configuration)|pre=unchanged}}
| class="col4 centeralign" |  
+
{{PacketList|{{change|0x01|0x02}}|Disconnect (configuration)|pre=unchanged}}
|- class="row3"
+
{{PacketList|{{change|0x02|0x03}}|Finish Configuration|pre=unchanged}}
| class="col1 centeralign" | Public key
+
{{PacketList|{{change|0x03|0x04}}|Clientbound Keep Alive (configuration)|pre=unchanged}}
| class="col2 centeralign" | byte array
+
{{PacketList|{{change|0x04|0x05}}|Ping (configuration)|pre=unchanged}}
| class="col3 centeralign" |  
+
{{PacketList|{{change|0x05|0x06}}|Registry Data|pre=unchanged}}
| class="col4 centeralign" |  
+
{{PacketList|{{change|0x06|0x07}}|Remove Resource Pack (configuration)|pre=unchanged}}
|- class="row4"
+
{{PacketList|{{change|0x07|0x08}}|Add Resource Pack (configuration)|pre=unchanged}}
| class="col1 centeralign" | Verify token length
+
{{PacketList|0x09|Store Cookie (configuration)|rel=added}}
| class="col2 centeralign" | short
+
{{PacketList|0x0A|Transfer (configuration)|rel=added}}
| class="col3 centeralign" |
+
{{PacketList|{{change|0x08|0x0B}}|Feature Flags|pre=unchanged}}
| class="col4 centeralign" |  
+
{{PacketList|{{change|0x09|0x0C}}|Update Tags (configuration)|pre=unchanged}}
|- 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
 
|}
 
  
 +
|-
 +
!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}}
 +
|-
 +
!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|{{change|0x1A|0x1B}}|Delete Message|pre=unchanged}}
 +
{{PacketList|{{change|0x1B|0x1C}}|Disconnect (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x1C|0x1D}}|Disguised Chat Message|pre=unchanged}}
 +
{{PacketList|{{change|0x1D|0x1E}}|Entity Event|pre=unchanged}}
 +
{{PacketList|{{change|0x1E|0x1F}}|Explosion|pre=unchanged}}
 +
{{PacketList|{{change|0x1F|0x20}}|Unload Chunk|pre=unchanged}}
 +
{{PacketList|{{change|0x20|0x21}}|Game Event|pre=unchanged}}
 +
{{PacketList|{{change|0x21|0x22}}|Open Horse Screen|pre=unchanged}}
 +
{{PacketList|{{change|0x22|0x23}}|Hurt Animation|pre=unchanged}}
 +
{{PacketList|{{change|0x23|0x24}}|Initialize World Border|pre=unchanged}}
 +
{{PacketList|{{change|0x24|0x25}}|Clientbound Keep Alive (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x25|0x26}}|Chunk Data and Update Light|pre=unchanged}}
 +
{{PacketList|{{change|0x26|0x27}}|World Event|pre=unchanged}}
 +
{{PacketList|{{change|0x27|0x28}}|Particle|pre=unchanged}}
 +
{{PacketList|{{change|0x28|0x29}}|Update Light|pre=unchanged}}
 +
{{PacketList|{{change|0x29|0x2A}}|Login (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x2A|0x2B}}|Map Data|pre=unchanged}}
 +
{{PacketList|{{change|0x2B|0x2C}}|Merchant Offers|pre=unchanged}}
 +
{{PacketList|{{change|0x2C|0x2D}}|Update Entity Position|pre=unchanged}}
 +
{{PacketList|{{change|0x2D|0x2E}}|Update Entity Position and Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x2E|0x2F}}|Update Entity Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x2F|0x30}}|Move Vehicle|pre=unchanged}}
 +
{{PacketList|{{change|0x30|0x31}}|Open Book|pre=unchanged}}
 +
{{PacketList|{{change|0x31|0x32}}|Open Screen|pre=unchanged}}
 +
{{PacketList|{{change|0x32|0x33}}|Open Sign Editor|pre=unchanged}}
 +
{{PacketList|{{change|0x33|0x34}}|Ping (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x34|0x35}}|Ping Response (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x35|0x36}}|Place Ghost Recipe|pre=unchanged}}
 +
{{PacketList|{{change|0x36|0x37}}|Player Abilities|pre=unchanged}}
 +
{{PacketList|{{change|0x37|0x38}}|Player Chat Message|pre=unchanged}}
 +
{{PacketList|{{change|0x38|0x39}}|End Combat|pre=unchanged}}
 +
{{PacketList|{{change|0x39|0x3A}}|Enter Combat|pre=unchanged}}
 +
{{PacketList|{{change|0x3A|0x3B}}|Combat Death|pre=unchanged}}
 +
{{PacketList|{{change|0x3B|0x3C}}|Player Info Remove|pre=unchanged}}
 +
{{PacketList|{{change|0x3C|0x3D}}|Player Info Update|pre=unchanged}}
 +
{{PacketList|{{change|0x3D|0x3E}}|Look At|pre=unchanged}}
 +
{{PacketList|{{change|0x3E|0x3F}}|Synchronize Player Position|pre=unchanged}}
 +
{{PacketList|{{change|0x3F|0x40}}|Update Recipe Book|pre=unchanged}}
 +
{{PacketList|{{change|0x40|0x41}}|Remove Entities|pre=unchanged}}
 +
{{PacketList|{{change|0x41|0x42}}|Remove Entity Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x42|0x43}}|Reset Score|pre=unchanged}}
 +
{{PacketList|{{change|0x43|0x44}}|Remove Resource Pack (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x44|0x45}}|Add Resource Pack (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x45|0x46}}|Respawn|pre=unchanged}}
 +
{{PacketList|{{change|0x46|0x47}}|Set Head Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x47|0x48}}|Update Section Blocks|pre=unchanged}}
 +
{{PacketList|{{change|0x48|0x49}}|Select Advancements Tab|pre=unchanged}}
 +
{{PacketList|{{change|0x49|0x4A}}|Server Data|pre=unchanged}}
 +
{{PacketList|{{change|0x4A|0x4B}}|Set Action Bar Text|pre=unchanged}}
 +
{{PacketList|{{change|0x4B|0x4C}}|Set Border Center|pre=unchanged}}
 +
{{PacketList|{{change|0x4C|0x4D}}|Set Border Lerp Size|pre=unchanged}}
 +
{{PacketList|{{change|0x4D|0x4E}}|Set Border Size|pre=unchanged}}
 +
{{PacketList|{{change|0x4E|0x4F}}|Set Border Warning Delay|pre=unchanged}}
 +
{{PacketList|{{change|0x4F|0x50}}|Set Border Warning Distance|pre=unchanged}}
 +
{{PacketList|{{change|0x50|0x51}}|Set Camera|pre=unchanged}}
 +
{{PacketList|{{change|0x51|0x52}}|Set Held Item|pre=unchanged}}
 +
{{PacketList|{{change|0x52|0x53}}|Set Center Chunk|pre=unchanged}}
 +
{{PacketList|{{change|0x53|0x54}}|Set Render Distance|pre=unchanged}}
 +
{{PacketList|{{change|0x54|0x55}}|Set Default Spawn Position|pre=unchanged}}
 +
{{PacketList|{{change|0x55|0x56}}|Display Objective|pre=unchanged}}
 +
{{PacketList|{{change|0x56|0x57}}|Set Entity Metadata|pre=unchanged}}
 +
{{PacketList|{{change|0x57|0x58}}|Link Entities|pre=unchanged}}
 +
{{PacketList|{{change|0x58|0x59}}|Set Entity Velocity|pre=unchanged}}
 +
{{PacketList|{{change|0x59|0x5A}}|Set Equipment|pre=unchanged}}
 +
{{PacketList|{{change|0x5A|0x5B}}|Set Experience|pre=unchanged}}
 +
{{PacketList|{{change|0x5B|0x5C}}|Set Health|pre=unchanged}}
 +
{{PacketList|{{change|0x5C|0x5D}}|Update Objectives|pre=unchanged}}
 +
{{PacketList|{{change|0x5D|0x5E}}|Set Passengers|pre=unchanged}}
 +
{{PacketList|{{change|0x5E|0x5F}}|Update Teams|pre=unchanged}}
 +
{{PacketList|{{change|0x5F|0x60}}|Update Score|pre=unchanged}}
 +
{{PacketList|{{change|0x60|0x61}}|Set Simulation Distance|pre=unchanged}}
 +
{{PacketList|{{change|0x61|0x62}}|Set Subtitle Text|pre=unchanged}}
 +
{{PacketList|{{change|0x62|0x63}}|Update Time|pre=unchanged}}
 +
{{PacketList|{{change|0x63|0x64}}|Set Title Text|pre=unchanged}}
 +
{{PacketList|{{change|0x64|0x65}}|Set Title Animation Times|pre=unchanged}}
 +
{{PacketList|{{change|0x65|0x66}}|Entity Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x66|0x67}}|Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x67|0x68}}|Start Configuration|pre=unchanged}}
 +
{{PacketList|{{change|0x68|0x69}}|Stop Sound|pre=unchanged}}
 +
{{PacketList|0x6A|Store Cookie (Play)|rel=added}}
 +
{{PacketList|{{change|0x69|0x6B}}|System Chat Message|pre=unchanged}}
 +
{{PacketList|{{change|0x6A|0x6C}}|Set Tab List Header And Footer|pre=unchanged}}
 +
{{PacketList|{{change|0x6B|0x6D}}|Tag Query Response|pre=unchanged}}
 +
{{PacketList|{{change|0x6C|0x6E}}|Pickup Item|pre=unchanged}}
 +
{{PacketList|{{change|0x6D|0x6F}}|Teleport Entity|pre=unchanged}}
 +
{{PacketList|{{change|0x6E|0x70}}|Set Ticking State|pre=unchanged}}
 +
{{PacketList|{{change|0x6F|0x71}}|Step Tick|pre=unchanged}}
 +
{{PacketList|0x72|Transfer (Play)|rel=added}}
 +
{{PacketList|{{change|0x70|0x73}}|Update Advancements|pre=unchanged}}
 +
{{PacketList|{{change|0x71|0x74}}|Update Attributes}}
 +
{{PacketList|{{change|0x72|0x75}}|Entity Effect}}
 +
{{PacketList|{{change|0x73|0x76}}|Update Recipes|pre=unchanged}}
 +
{{PacketList|{{change|0x74|0x77}}|Update Tags (play)|pre=unchanged}}
 +
|-
 +
!colspan="4"| Play serverbound
 +
{{PacketList|0x10|Cookie Response (play)|rel=added}}
 +
{{PacketList|{{change|0x10|0x11}}|Serverbound Plugin Message (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x11|0x12}}|Edit Book|pre=unchanged}}
 +
{{PacketList|{{change|0x12|0x13}}|Query Entity Tag|pre=unchanged}}
 +
{{PacketList|{{change|0x13|0x14}}|Interact|pre=unchanged}}
 +
{{PacketList|{{change|0x14|0x15}}|Jigsaw Generate|pre=unchanged}}
 +
{{PacketList|{{change|0x15|0x16}}|Serverbound Keep Alive (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x16|0x17}}|Lock Difficulty|pre=unchanged}}
 +
{{PacketList|{{change|0x17|0x18}}|Set Player Position|pre=unchanged}}
 +
{{PacketList|{{change|0x18|0x19}}|Set Player Position and Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x19|0x1A}}|Set Player Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x1A|0x1B}}|Set Player On Ground|pre=unchanged}}
 +
{{PacketList|{{change|0x1B|0x1C}}|Move Vehicle|pre=unchanged}}
 +
{{PacketList|{{change|0x1C|0x1D}}|Paddle Boat|pre=unchanged}}
 +
{{PacketList|{{change|0x1D|0x1E}}|Pick Item|pre=unchanged}}
 +
{{PacketList|{{change|0x1E|0x1F}}|Ping Request (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x1F|0x20}}|Place Recipe|pre=unchanged}}
 +
{{PacketList|{{change|0x20|0x21}}|Player Abilities|pre=unchanged}}
 +
{{PacketList|{{change|0x21|0x22}}|Player Action|pre=unchanged}}
 +
{{PacketList|{{change|0x22|0x23}}|Player Command|pre=unchanged}}
 +
{{PacketList|{{change|0x23|0x24}}|Player Input|pre=unchanged}}
 +
{{PacketList|{{change|0x24|0x25}}|Pong (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x25|0x26}}|Change Recipe Book Settings|pre=unchanged}}
 +
{{PacketList|{{change|0x26|0x27}}|Set Seen Recipe|pre=unchanged}}
 +
{{PacketList|{{change|0x27|0x28}}|Rename Item|pre=unchanged}}
 +
{{PacketList|{{change|0x28|0x29}}|Resource Pack Response (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x29|0x2A}}|Seen Advancements|pre=unchanged}}
 +
{{PacketList|{{change|0x2A|0x2B}}|Select Trade|pre=unchanged}}
 +
{{PacketList|{{change|0x2B|0x2C}}|Set Beacon Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x2C|0x2D}}|Set Held Item|pre=unchanged}}
 +
{{PacketList|{{change|0x2D|0x2E}}|Program Command Block|pre=unchanged}}
 +
{{PacketList|{{change|0x2E|0x2F}}|Program Command Block Minecart|pre=unchanged}}
 +
{{PacketList|{{change|0x2F|0x30}}|Set Creative Mode Slot|pre=unchanged}}
 +
{{PacketList|{{change|0x30|0x31}}|Program Jigsaw Block|pre=unchanged}}
 +
{{PacketList|{{change|0x31|0x32}}|Program Structure Block|pre=unchanged}}
 +
{{PacketList|{{change|0x32|0x33}}|Update Sign|pre=unchanged}}
 +
{{PacketList|{{change|0x33|0x34}}|Swing Arm|pre=unchanged}}
 +
{{PacketList|{{change|0x34|0x35}}|Teleport To Entity|pre=unchanged}}
 +
{{PacketList|{{change|0x35|0x36}}|Use Item On|pre=unchanged}}
 +
{{PacketList|{{change|0x36|0x37}}|Use Item|pre=unchanged}}
 +
|}
  
 +
== New/modified data types ==
  
 +
No changes so far.
  
 +
== Entity Metadata ==
  
=== Named Sound Effect (0x3E) ===
+
{{#vardefine: meta_prerelease | 1}}
  
''Server to client''
+
{{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|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|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
 +
|}
  
Used to play a sound effect on the client.
+
=== Armadillo ===
  
{| class="wikitable"
+
{{Metadata inherit|Armadillo|inherits=Animal|start_at=17}}
|- class="row0"
+
{| class="wikitable" {{added}}
! class="col0" | Packet ID
+
! Index
! class="col1" | Field Name
+
! Type
! class="col2" | Field Type
+
!style="width: 250px;" colspan="2"| Meaning
! class="col3" | Example
+
! Default
! class="col4" | Notes
+
|-
|- class="row1"
+
| {{Metadata id|added}}
| class="col0 centeralign" rowspan="6" | 0x3E
+
| {{Metadata type|Armadillo State}}
| class="col1 centeralign" | Sound name
+
|colspan="2"| Armadillo State
| class="col2 centeralign" | string
+
| IDLE
| 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) ===
+
== Block Actions ==
  
{| class="wikitable"
+
No changes so far.
|- 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 | 0x37
 
| class="col1 centeralign" | EID?
 
| class="col2 centeralign" | int
 
| class="col3 centeralign" |
 
| class="col4" | Entity breaking the block?
 
|- class="row2"
 
| class="col1 centeralign" | X
 
| class="col2 centeralign" | int
 
| class="col3 centeralign" |
 
| class="col4" rowspan=3 | Block position
 
|- class="row2"
 
| class="col1 centeralign" | Y
 
| class="col2 centeralign" | int
 
| class="col3 centeralign" |
 
|- class="row2"
 
| class="col1 centeralign" | Z
 
| class="col2 centeralign" | int
 
| class="col3 centeralign" |
 
|- class="row3"
 
| class="col1 centeralign" | Unknown
 
| class="col2 centeralign" | byte
 
| class="col3 centeralign" | 1
 
| class="col4" | ?
 
|- class="row2"
 
! class="col0" | Total Size:
 
| class="col1 rightalign" colspan="4" | 4 bytes
 
|}
 
  
== Changed Data Type ==
+
== Inventories ==
  
=== Slot Data ===
+
No changes so far.
  
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.
+
== Plugin Channels ==
  
This change affects any packets with [[Slot Data]], including:
+
No changes so far.
* 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 ==
+
== Handshake ==
  
=== Login Request (0x01) ===
+
=== Serverbound ===
  
''Server to Client''
+
==== Handshake ====
  
See [[Protocol Encryption]] for information on logging in.
+
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="7" | 0x01
+
| rowspan="4"| 0x00
| class="col1 centeralign" | Entity ID
+
| rowspan="4"| Handshaking
| class="col2 centeralign" | int
+
| rowspan="4"| Server
| class="col3 centeralign" | <code>1298</code>
+
| Protocol Version
| class="col4" | The Players Entity ID
+
| [[#Definitions:varint|VarInt]]
|- class="row2"
+
| See [[protocol version numbers]] (currently 765 in Minecraft 1.20.4).
| class="col0 centeralign" | Level Type
+
|-
| class="col1 centeralign" | string
+
| Server Address
| class="col2 centeralign" | default
+
| [[#Definitions:string|String]] (255)
| class="col3" | default or SUPERFLAT; level-type in server.properties
+
| 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="col0 centeralign" | Server mode
+
| Server Port
| class="col1 centeralign" | byte
+
| [[#Definitions:unsigned-short|Unsigned Short]]
| class="col2 centeralign" | <code>0</code>
+
| Default is 25565. The Notchian server does not use this information.
| class="col3" | 0 for survival, 1 for creative
+
|-
|- class="row4"
+
| Next State
| class="col0 centeralign" | Dimension
+
| [[#Definitions:varint|VarInt]] [[#Definitions:enum|Enum]]
| class="col1 centeralign" | byte
+
| 1 for [[#Status|Status]], 2 for [[#Login|Login]]{{change||, 3 for [[#Login|Transfer]]}}.
| 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) ===
+
== Status ==
  
''Client to server''
+
=== Clientbound ===
  
See [[Protocol Encryption]] for information on logging in.
+
No changes so far.
  
{| class="wikitable"
+
=== Serverbound ===
|- 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) ===
+
No changes so far.
  
''Server to 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="3" | 0x05
 
| class="col1 centeralign" | Entity ID
 
| class="col2 centeralign" | int
 
| class="col3 centeralign" | 0x00010643
 
| 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) ===
+
==== Cookie Request (login) ====
  
''Two-Way''
+
Requests a cookie that was previously stored.
  
Sent by the client when the player presses the "Respawn" button after dying. The server then teleports the user to the spawn point, and sends a respawn packet in responseThe client will not leave the respawn screen until it receives a respawn packet.
+
{| 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.
 +
  |}
  
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.
+
=== Serverbound ===
  
'''Client to Server'''
+
==== Cookie Response (login) ====
  
{| class="wikitable"
+
Response to a [[#Cookie_Request_(login)|Cookie Request (login)]] from the server. The Notchian server only accepts responses of up to 5 kiB in size.
|- class="row0"
 
! class="col0" | Packet ID
 
|- class="row1"
 
| class="col0 centeralign" | 0x09
 
|}
 
  
'''Server to Client'''
+
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
! Notes
 +
|-
 +
| rowspan="3"| 0x04
 +
| rowspan="3"| Login
 +
| rowspan="3"| 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
 +
| colspan="2"| Optional ByteArray(5120)
 +
| The data of the cookie, if any.
 +
|}
  
{| class="wikitable"
+
== Configuration ==
|- 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" | 0x09
 
| class="col1 centeralign" | Dimension
 
| class="col2 centeralign" | int
 
| class="col3 centeralign" | <code>1</code>
 
| class="col4" | <code>-1</code>: The Nether, <code>0</code>: The Overworld, <code>1</code>: The End
 
|- class="row2"
 
| class="col1 centeralign" | Difficulty
 
| class="col2 centeralign" | byte
 
| class="col3 centeralign" | <code>1</code>
 
| class="col4" | <code>0</code> thru <code>3</code> for Peaceful, Easy, Normal, Hard. <code>1</code> is always sent c->s
 
|- class="row3"
 
| class="col1 centeralign" | Creative mode
 
| class="col2 centeralign" | byte
 
| class="col3 centeralign" | <code>1</code>
 
| class="col4" | <code>0</code> for survival, <code>1</code> for creative.
 
|- class="row4"
 
| class="col1 centeralign" | World height
 
| class="col2 centeralign" | short
 
| class="col3 centeralign" | <code>256</code>
 
| class="col4" | Defaults to <code>256</code>
 
|- class="row5"
 
| class="col1 centeralign" | Level Type
 
| class="col2 centeralign" | string
 
| class="col3 centeralign" | default
 
| class="col4" | See [[#0x01|0x01 login]]
 
|- class="row6"
 
! class="col0" | Total Size:
 
| class="col1 rightalign" colspan="4" | 11 bytes + length of string
 
|}
 
  
=== Player Block Placement (0x0F) ===
+
=== Clientbound ===
  
''Client to Server''
+
==== 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="8" | 0x0F
 
| class="col1 centeralign" | X
 
| class="col2 centeralign" | int
 
| class="col3 centeralign" | <code>32</code>
 
| class="col4" | Block position
 
|- class="row2"
 
| class="col0 centeralign" | Y
 
| class="col1 centeralign" | unsigned byte
 
| class="col2 centeralign" | <code>64</code>
 
| class="col3" | Block position
 
|- 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) ===
+
{| 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''
+
==== Store Cookie (configuration) ====
  
{| class="wikitable"
+
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="row0"
 
! class="col0 centeralign" | Packet ID
 
! class="col1 rightalign" | Field Name
 
! class="col2" | Field Type
 
! class="col3" | Example
 
! class="col4" | Notes
 
|- class="row1"
 
| class="col0 centeralign" rowspan="9" | 0x14
 
| class="col1" | EID
 
| class="col2" | int
 
| class="col3" | <code>94453</code>
 
| class="col4" | Player ID
 
|- class="row2"
 
| class="col0" | Player Name
 
| class="col1" | string
 
| class="col2" | <code>Twdtwd</code>
 
| class="col3" | Max length of 16
 
|- 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) ===
+
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
! Notes
 +
|-
 +
| rowspan="2"| 0x09
 +
| rowspan="2"| Configuration
 +
| rowspan="2"| Client
 +
| colspan="2"| Key
 +
| colspan="2"| Identifier
 +
| The identifier of the cookie.
 +
|-
 +
| colspan="2"| Payload
 +
| colspan="2"| ByteArray(5120)
 +
| The data of the cookie.
 +
|}
  
''Server to Client''
+
==== Transfer (configuration) ====
  
Sent by the server when an Object/Vehicle is created. The throwers entity id is now used for fishing floats too.
+
Notifies the client that it should transfer to the given server. Cookies previously stored are preserved between server transfers.
 
 
{| 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="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="2"| 0x0A
 +
| rowspan="2"| Configuration
 +
| 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.
 +
|}
  
{{anchor|0x18}}
+
=== Serverbound ===
  
=== Spawn Mob (0x18) ===
+
==== Cookie Response (configuration) ====
  
''Server to Client''
+
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.
  
Sent by the server when a Mob Entity is Spawned
+
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
! Notes
 +
|-
 +
| rowspan="3"| 0x01
 +
| rowspan="3"| Configuration
 +
| rowspan="3"| 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
 +
| colspan="2"| Optional ByteArray(5120)
 +
| The data of the cookie, if any.
 +
|}
  
{| class="wikitable"
+
== 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)
 
|}
 
  
 +
=== Clientbound ===
  
{{anchor|0x19}}
+
==== Cookie Request (play) ====
  
=== Destroy Entity (0x1D) ===
+
Requests a cookie that was previously stored.
  
''Server to Client''
+
{| 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.
 +
|}
  
Sent by the server when an list of Entities is to be destroyed on the client.
+
==== Store Cookie (play) ====
  
{| class="wikitable"
+
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="row0"
 
! class="col0" | Packet ID
 
! class="col1" | Field Name
 
! class="col2" | Field Type
 
! class="col3" | Example
 
! class="col4" | Notes
 
|- class="row1"
 
| class="col0 " rowspan="2" | 0x1D
 
| class="col1 centeralign" | Entity Count
 
| class="col2 centeralign" | byte
 
| class="col3 centeralign" | <code>3</code>
 
| class="col4 centeralign" | The amount of entities which should be destroyed
 
|- class="row21"
 
| class="col1 centeralign" | Entity IDs
 
| class="col2 centeralign" | array of int
 
| class="col3 centeralign" | <code>452, 546, 123</code>
 
| class="col4 centeralign" | The list of entity ids which should be destroyed
 
|- class="row32"
 
! class="col0" | Total Size:
 
| class="col1 rightalign" colspan="4" | 2 + (entity count * 4) bytes
 
|}
 
  
 +
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
! Notes
 +
|-
 +
| rowspan="2"| 0x6A
 +
| rowspan="2"| Play
 +
| rowspan="2"| Client
 +
| colspan="2"| Key
 +
| colspan="2"| Identifier
 +
| The identifier of the cookie.
 +
|-
 +
| colspan="2"| Payload
 +
| colspan="2"| ByteArray(5120)
 +
| The data of the cookie.
 +
|}
  
{{anchor|0x1E}}
+
==== Transfer (play) ====
  
=== Chunk Data (0x33) ===
+
Notifies the client that it should transfer to the given server. Cookies previously stored are preserved between server transfers.
  
''Server to Client''
+
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
! Notes
 +
|-
 +
| rowspan="2"| 0x72
 +
| 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.
 +
|}
  
See also: [[Map Format]]
+
==== Update Attributes ====
  
Chunks are sent a column at a time, with some sections optionally missing from each packet (those consisting only of air).
+
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="7" | 0x33
+
| rowspan="6"| 0x71
| class="col1 centeralign" | X
+
| rowspan="6"| Play
| class="col2 centeralign" | int
+
| rowspan="6"| Client
| class="col3 centeralign" |  
+
| colspan="2"| Entity ID
| class="col4" | Chunk X Coordinate (*16 to get true X)
+
| colspan="2"| VarInt
|- class="row2"
+
|
| class="col0 centeralign" | Z
+
|-
| class="col1 centeralign" | int
+
| colspan="2"| Number Of Properties
| class="col2 centeralign" |
+
| colspan="2"| VarInt
| class="col3" | Chunk Z Coordinate (*16 to get true Z)
+
| Number of elements in the following array.
|- class="row3"
+
|-
| class="col0 centeralign" | Ground-up continuous
+
| rowspan="4"| Property
| class="col1 centeralign" | boolean
+
| {{change|Key|Id}}
| class="col2 centeralign" |  
+
| rowspan="4"| Array
| 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.
+
| {{change|Identifier|VarInt Enum}}
|- class="row4"
+
| See below.
| class="col0 centeralign" | Primary bit map
+
|-
| class="col1 centeralign" | unsigned short
+
| Value
| class="col2 centeralign" | 15
+
| Double
| class="col3" | Bitmask with 1 for every 16x16x16 section which data follows in the compressed data.
+
| See below.
|- class="row5"
+
|-
| class="col0 centeralign" | Add bit map
+
| Number Of Modifiers
| class="col1 centeralign" | unsigned short
+
| VarInt
| class="col2 centeralign" | 0
+
| Number of elements in the following array.
| class="col3" | Same as above, but this is used exclusively for the 'add' portion of the payload
+
|-
|- class="row6"
+
| Modifiers
| class="col0 centeralign" | Compressed size
+
| Array of Modifier Data
| class="col1 centeralign" | int
+
| See {{Minecraft Wiki|Attribute#Modifiers}}. Modifier Data defined below.
| 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
 
|}
 
 
 
 
 
=== Block Change (0x35) ===
 
  
''Server to Client''
+
Known Key values (see also {{Minecraft Wiki|Attribute#Modifiers}}):
  
 
{| 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="5" | 0x35
+
|-
| 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" | byte
+
|-
| 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" | Block Type
+
| generic.attack_damage
| class="col1 centeralign" | short
+
| 2.0
| class="col2 centeralign" | <code>78</code>
+
| 0.0
| class="col3" | The new block type for the block
+
| 2048.0
|- class="row5"
+
| Attack Damage.
| class="col0 centeralign" | Block Metadata
+
|-
| class="col1 centeralign" | byte
+
| 3
| class="col2 centeralign" | <code>0</code>
+
| generic.attack_knockback
| class="col3" | The new Metadata for the block
+
| 0.0
|- class="row6"
+
| 0.0
! class="col0" | Total Size:
+
| 5.0
| class="col1 rightalign" colspan="4" | 13 bytes
+
| Attack Knockback.
|}
+
|-
 
+
| 4
=== Block Action (0x36) ===
+
| generic.attack_speed
 +
| 4.0
 +
| 0.0
 +
| 1024.0
 +
| Attack Speed.
 +
|- {{added}}
 +
| 5
 +
| generic.block_interaction_range
 +
| 4.5
 +
| 0.0
 +
| 64.0
 +
| Block Interaction Range.
 +
|- {{added}}
 +
| 6
 +
| generic.entity_interaction_range
 +
| 3.0
 +
| 0.0
 +
| 64.0
 +
| Entity Interaction Range.
 +
|-
 +
| 7
 +
| generic.flying_speed
 +
| 0.4
 +
| 0.0
 +
| 1024.0
 +
| Flying Speed.
 +
|-
 +
| 8
 +
| generic.follow_range
 +
| 32.0
 +
| 0.0
 +
| 2048.0
 +
| Follow Range.
 +
|-
 +
| 9
 +
| horse.jump_strength
 +
| 0.7
 +
| 0.0
 +
| 2.0
 +
| Jump Strength.
 +
|-
 +
| 10
 +
| generic.knockback_resistance
 +
| 0.0
 +
| 0.0
 +
| 1.0
 +
| Knockback Resistance.
 +
|-
 +
| 11
 +
| generic.luck
 +
| 0.0
 +
| -1024.0
 +
| 1024.0
 +
| Luck.
 +
|-
 +
| 12
 +
| generic.max_absorption
 +
| 0.0
 +
| 0.0
 +
| 2048.0
 +
| Max Absorption.
 +
|-
 +
| 13
 +
| generic.max_health
 +
| 20.0
 +
| 1.0
 +
| 1024.0
 +
| Max Health.
 +
|-
 +
| 14
 +
| generic.movement_speed
 +
| 0.7
 +
| 0.0
 +
| 1024.0
 +
| Movement Speed.
 +
|- {{added}}
 +
| 15
 +
| generic.scale
 +
| 1.0
 +
| 0.0625
 +
| 16.0
 +
| Scale.
 +
|-
 +
| 16
 +
| zombie.spawn_reinforcements
 +
| 0.0
 +
| 0.0
 +
| 1.0
 +
| Spawn Reinforcements Chance.
 +
|- {{added}}
 +
| 17
 +
| generic.step_height
 +
| 0.6
 +
| 0.0
 +
| 10.0
 +
| Step Height.
 +
|}
  
''Server to Client''
+
''Modifier Data'' structure:
 
 
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
+
! 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" | 0x36
+
|
| class="col1 centeralign" | X
+
|-
| class="col2 centeralign" | int
+
| Amount
| class="col3 centeralign" | <code>502</code>
+
| Double
| class="col4" | Block X Coordinate
+
| May be positive or negative.
|- class="row2"
+
|-
| class="col0 centeralign" | Y
+
| Operation
| class="col1 centeralign" | short
+
| Byte
| class="col2 centeralign" | <code>71</code>
+
| See below.
| class="col3" | Block Y Coordinate
+
|}
|- class="row3"
 
| class="col0 centeralign" | Z
 
| class="col1 centeralign" | int
 
| class="col2 centeralign" | <code>18</code>
 
| class="col3" | Block Z Coordinate
 
|- class="row4"
 
| class="col0 centeralign" | Byte 1
 
| class="col1 centeralign" | byte
 
| class="col2 centeralign" | <code>3</code>
 
| class="col3" | Varies depending on block - see below
 
|- class="row5"
 
| class="col0 centeralign" | Byte 2
 
| class="col1 centeralign" | byte
 
| class="col2 centeralign" | <code>17</code>
 
| class="col3" | Varies depending on block - see below
 
|- class="row6"
 
| class="col0 centeralign" | Block ID
 
| class="col1 centeralign" | byte
 
| class="col2 centeralign" | <code>29</code>
 
| class="col3" | The block id this action is set for
 
|- class="row7"
 
! class="col0" | Total Size:
 
| class="col1 rightalign" colspan="4" | 13 bytes
 
|}
 
  
See Also: [[Block Actions]]
+
The operation controls how the base value of the modifier is changed.
  
=== Update Tile Entity (0x84) ===
+
* 0: Add/subtract amount
 +
* 1: Add/subtract amount percent of the current value
 +
* 2: Multiply by amount percent
  
''Server to Client''
+
All of the 0's are applied first, and then the 1's, and then the 2's.
  
Essentially a block update on a tile entity.
+
==== Entity Effect ====
  
 
{| 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="6" | 0x84
+
| rowspan="7"| 0x72
| class="col1 centeralign" | X
+
| rowspan="7"| Play
| class="col2 centeralign" | int
+
| rowspan="7"| Client
| class="col3 centeralign" |
+
| Entity ID
| class="col4" |
+
| VarInt
|- class="row2"
+
|
| class="col0 centeralign" | Y
+
|-
| class="col1 centeralign" | short
+
| Effect ID
| class="col2 centeralign" |
+
| VarInt
| class="col3" |
+
| See {{Minecraft Wiki|Status effect#Effect list|this table}}.
|- class="row3"
+
|-
| class="col0 centeralign" | Z
+
| Amplifier
| class="col1 centeralign" | int
+
| Byte
| class="col2 centeralign" |
+
| Notchian client displays effect level as Amplifier + 1.
| class="col3" |
+
|-
|- class="row4"
+
| Duration
| class="col0 centeralign" | Action
+
| VarInt
| class="col1 centeralign" | byte
+
| Duration in ticks. (-1 for infinite)
| class="col2 centeralign" |
+
|-
| class="col3" | The type of update to perform
+
| Flags
|- class="row5"
+
| Byte
| class="col0 centeralign" | Data length
+
| Bit field, see below.
| class="col1 centeralign" | Short
+
|- {{removed}}
| class="col2 centeralign" |
+
| Has Factor Data
| class="col3" | Varies
+
| Boolean
|- class="row6"
+
| Used in DARKNESS effect
| class="col0 centeralign" | NBT Data
+
|- {{removed}}
| class="col1 centeralign" | Byte Array - Present if data length > 0
+
| Factor Codec
| class="col2 centeralign" |
+
| NBT Tag
| class="col3" | Varies
+
| See below
|- class="row7"
+
|}
! class="col0" | Total Size:
 
| class="col1 rightalign" colspan="4" | 12 + itemstack bytes
 
|}
 
 
 
'''Actions'''
 
 
 
* '''1''': Set mob displayed inside a mob spawner. Custom 1 contains the [[Entities#Mobs|mob type]]
 
 
 
=== Explosion (0x3C) ===
 
 
 
''Server to Client''
 
 
 
Sent when an explosion occurs (creepers, TNT, and ghast fireballs).
 
 
 
{| 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=9 | 0x3C
 
| class="col1 centeralign" | X
 
| class="col2 centeralign" | double
 
| class="col3 centeralign" |  
 
| class="col4" |
 
|- class="row1"
 
| class="col1 centeralign" | Y
 
| class="col2 centeralign" | double
 
| class="col3 centeralign" |
 
| class="col4" |  
 
|- class="row1"
 
| class="col1 centeralign" | Z
 
| class="col2 centeralign" | double
 
| class="col3 centeralign" |  
 
| class="col4" |  
 
|- class="row1"
 
| class="col1 centeralign" | Radius
 
| class="col2 centeralign" | float
 
| class="col3 centeralign" | 3.0
 
| class="col4" | Currently unused in the client
 
|- class="row2"
 
| class="col1 centeralign" | Record count
 
| class="col2 centeralign" | int
 
| class="col3 centeralign" |
 
| class="col4" | This is the count, not the size. The size is 3 times this value.
 
|- class="row3"
 
| class="col1 centeralign" | Records
 
| class="col2 centeralign" | (byte, byte, byte) × count
 
| class="col3 centeralign" |
 
| class="col4" | Each record is 3 bytes, which seem to be XYZ offsets of affected blocks.
 
|- 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) ===
 
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 ==
 
 
 
=== Chunk Allocation Packet (0x32) ===
 
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.
 
 
 
This is the payload which is used in the Compressed Data part to deallocate a chunk column:
 
 
 
0x78, 0x9C, 0x63, 0x64, 0x1C, 0xD9, 0x00, 0x00, 0x81, 0x80, 0x01, 0x01
 
 
 
== Protocol History ==
 
 
 
=== 2012-07-24 ===
 
* 12w30c
 
* Protocol version 39
 
* Changed packets 0x84
 
 
 
=== 2012-07-23 ===
 
* 12w30a
 
* Protocol version is still 38
 
* Changed packets 0x14 and 0x35
 
  
=== 2012-07-05 ===
+
{{Need Info|What exact effect does the blend bit flag have on the client? What happens if it is used on effects besides DARKNESS?}}
* 12w27a
 
* Protocol version is now 38
 
* Added packet 0x38
 
  
=== 2012-06-21 ===
+
Within flags:
* 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 ===
+
* 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.
* 12w24a
+
* 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.
* Protocol version is now 36
+
* 0x04: Show icon - should the icon be displayed on the client?  Usually should be enabled.
* Changed Packet 0x01(Login Request), only used as Login Reply
+
* {{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.}}
* New Packet 0xCD used for Login Request and Respawn (1 byte payload)
 
* All items (except the empty hand) now send enchantment data
 
  
=== 2012-06-07 ===
+
{{change|Factor Data|}}
* 12w23b
+
{| class="wikitable" {{removed}}
* Protocol version is now 35
+
!Name
* Change packet: Player Block Placement
+
!Type
* New Packet: Block breaking animation
+
!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
 +
|}
  
=== 2012-05-24 ===
+
=== Serverbound ===
* 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 ===
+
==== Cookie Response (play) ====
* 12w19a
 
* No packet changes, but an other encryption algorythm is used, described in [[Protocol Encryption]]
 
* The items which are not enchantable in 12w18a are now readded
 
* Fishing floats, spawned by a 0x17 packet do now use the extra fields
 
  
=== 2012-05-03 ===
+
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.
* 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
+
! colspan="2"| Field Name
* Changed packet: 0x02 Handshake
+
! colspan="2"| Field Type
* Changed packet: 0xCC Locale and View Distance
+
! Notes
* Changed packet: 0xCA Player Abilities
+
|-
* New packet: 0xFC Encryption Key Response
+
| rowspan="3"| 0x6A
* New packet: 0xFD Encryption Key Request
+
| rowspan="3"| Play
* New Item: Book & Quills (0x182) is enchantable
+
| rowspan="3"| Server
* New Item: Written Book (0x183) is enchantable
+
| 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
 +
| colspan="2"| Optional ByteArray(5120)
 +
| The data of the cookie, if any.
 +
|}
  
=== 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 05:25, 26 February 2024

This page documents the changes from the last stable Minecraft release (currently 1.20.4, protocol 765) to the current pre-release (currently 24w03b, protocol Snapshot 172). 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
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)
0x05 0x06 Registry Data Current (unchanged)
0x06 0x07 Remove Resource Pack (configuration) Current (unchanged)
0x07 0x08 Add Resource Pack (configuration) Current (unchanged)
0x09 Store Cookie (configuration) Pre
0x0A Transfer (configuration) Pre
0x08 0x0B Feature Flags Current (unchanged)
0x09 0x0C Update Tags (configuration) Current (unchanged)
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)
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)
0x1A 0x1B Delete Message Current (unchanged)
0x1B 0x1C Disconnect (play) Current (unchanged)
0x1C 0x1D Disguised Chat Message Current (unchanged)
0x1D 0x1E Entity Event Current (unchanged)
0x1E 0x1F Explosion Current (unchanged)
0x1F 0x20 Unload Chunk Current (unchanged)
0x20 0x21 Game Event Current (unchanged)
0x21 0x22 Open Horse Screen Current (unchanged)
0x22 0x23 Hurt Animation Current (unchanged)
0x23 0x24 Initialize World Border Current (unchanged)
0x24 0x25 Clientbound Keep Alive (play) Current (unchanged)
0x25 0x26 Chunk Data and Update Light Current (unchanged)
0x26 0x27 World Event Current (unchanged)
0x27 0x28 Particle Current (unchanged)
0x28 0x29 Update Light Current (unchanged)
0x29 0x2A Login (play) Current (unchanged)
0x2A 0x2B Map Data Current (unchanged)
0x2B 0x2C Merchant Offers Current (unchanged)
0x2C 0x2D Update Entity Position Current (unchanged)
0x2D 0x2E Update Entity Position and Rotation Current (unchanged)
0x2E 0x2F Update Entity Rotation Current (unchanged)
0x2F 0x30 Move Vehicle Current (unchanged)
0x30 0x31 Open Book Current (unchanged)
0x31 0x32 Open Screen Current (unchanged)
0x32 0x33 Open Sign Editor Current (unchanged)
0x33 0x34 Ping (play) Current (unchanged)
0x34 0x35 Ping Response (play) Current (unchanged)
0x35 0x36 Place Ghost Recipe Current (unchanged)
0x36 0x37 Player Abilities Current (unchanged)
0x37 0x38 Player Chat Message Current (unchanged)
0x38 0x39 End Combat Current (unchanged)
0x39 0x3A Enter Combat Current (unchanged)
0x3A 0x3B Combat Death Current (unchanged)
0x3B 0x3C Player Info Remove Current (unchanged)
0x3C 0x3D Player Info Update Current (unchanged)
0x3D 0x3E Look At Current (unchanged)
0x3E 0x3F Synchronize Player Position Current (unchanged)
0x3F 0x40 Update Recipe Book Current (unchanged)
0x40 0x41 Remove Entities Current (unchanged)
0x41 0x42 Remove Entity Effect Current (unchanged)
0x42 0x43 Reset Score Current (unchanged)
0x43 0x44 Remove Resource Pack (play) Current (unchanged)
0x44 0x45 Add Resource Pack (play) Current (unchanged)
0x45 0x46 Respawn Current (unchanged)
0x46 0x47 Set Head Rotation Current (unchanged)
0x47 0x48 Update Section Blocks Current (unchanged)
0x48 0x49 Select Advancements Tab Current (unchanged)
0x49 0x4A Server Data Current (unchanged)
0x4A 0x4B Set Action Bar Text Current (unchanged)
0x4B 0x4C Set Border Center Current (unchanged)
0x4C 0x4D Set Border Lerp Size Current (unchanged)
0x4D 0x4E Set Border Size Current (unchanged)
0x4E 0x4F Set Border Warning Delay Current (unchanged)
0x4F 0x50 Set Border Warning Distance Current (unchanged)
0x50 0x51 Set Camera Current (unchanged)
0x51 0x52 Set Held Item Current (unchanged)
0x52 0x53 Set Center Chunk Current (unchanged)
0x53 0x54 Set Render Distance Current (unchanged)
0x54 0x55 Set Default Spawn Position Current (unchanged)
0x55 0x56 Display Objective Current (unchanged)
0x56 0x57 Set Entity Metadata Current (unchanged)
0x57 0x58 Link Entities Current (unchanged)
0x58 0x59 Set Entity Velocity Current (unchanged)
0x59 0x5A Set Equipment Current (unchanged)
0x5A 0x5B Set Experience Current (unchanged)
0x5B 0x5C Set Health Current (unchanged)
0x5C 0x5D Update Objectives Current (unchanged)
0x5D 0x5E Set Passengers Current (unchanged)
0x5E 0x5F Update Teams Current (unchanged)
0x5F 0x60 Update Score Current (unchanged)
0x60 0x61 Set Simulation Distance Current (unchanged)
0x61 0x62 Set Subtitle Text Current (unchanged)
0x62 0x63 Update Time Current (unchanged)
0x63 0x64 Set Title Text Current (unchanged)
0x64 0x65 Set Title Animation Times Current (unchanged)
0x65 0x66 Entity Sound Effect Current (unchanged)
0x66 0x67 Sound Effect Current (unchanged)
0x67 0x68 Start Configuration Current (unchanged)
0x68 0x69 Stop Sound Current (unchanged)
0x6A Store Cookie (Play) Pre
0x69 0x6B System Chat Message Current (unchanged)
0x6A 0x6C Set Tab List Header And Footer Current (unchanged)
0x6B 0x6D Tag Query Response Current (unchanged)
0x6C 0x6E Pickup Item Current (unchanged)
0x6D 0x6F Teleport Entity Current (unchanged)
0x6E 0x70 Set Ticking State Current (unchanged)
0x6F 0x71 Step Tick Current (unchanged)
0x72 Transfer (Play) Pre
0x70 0x73 Update Advancements Current (unchanged)
0x71 0x74 Update Attributes Current Pre
0x72 0x75 Entity Effect Current Pre
0x73 0x76 Update Recipes Current (unchanged)
0x74 0x77 Update Tags (play) Current (unchanged)
Play serverbound
0x10 Cookie Response (play) Pre
0x10 0x11 Serverbound Plugin Message (play) Current (unchanged)
0x11 0x12 Edit Book Current (unchanged)
0x12 0x13 Query Entity Tag Current (unchanged)
0x13 0x14 Interact Current (unchanged)
0x14 0x15 Jigsaw Generate Current (unchanged)
0x15 0x16 Serverbound Keep Alive (play) Current (unchanged)
0x16 0x17 Lock Difficulty Current (unchanged)
0x17 0x18 Set Player Position Current (unchanged)
0x18 0x19 Set Player Position and Rotation Current (unchanged)
0x19 0x1A Set Player Rotation Current (unchanged)
0x1A 0x1B Set Player On Ground Current (unchanged)
0x1B 0x1C Move Vehicle Current (unchanged)
0x1C 0x1D Paddle Boat Current (unchanged)
0x1D 0x1E Pick Item Current (unchanged)
0x1E 0x1F Ping Request (play) Current (unchanged)
0x1F 0x20 Place Recipe Current (unchanged)
0x20 0x21 Player Abilities Current (unchanged)
0x21 0x22 Player Action Current (unchanged)
0x22 0x23 Player Command Current (unchanged)
0x23 0x24 Player Input Current (unchanged)
0x24 0x25 Pong (play) Current (unchanged)
0x25 0x26 Change Recipe Book Settings Current (unchanged)
0x26 0x27 Set Seen Recipe Current (unchanged)
0x27 0x28 Rename Item Current (unchanged)
0x28 0x29 Resource Pack Response (play) Current (unchanged)
0x29 0x2A Seen Advancements Current (unchanged)
0x2A 0x2B Select Trade Current (unchanged)
0x2B 0x2C Set Beacon Effect Current (unchanged)
0x2C 0x2D Set Held Item Current (unchanged)
0x2D 0x2E Program Command Block Current (unchanged)
0x2E 0x2F Program Command Block Minecart Current (unchanged)
0x2F 0x30 Set Creative Mode Slot Current (unchanged)
0x30 0x31 Program Jigsaw Block Current (unchanged)
0x31 0x32 Program Structure Block Current (unchanged)
0x32 0x33 Update Sign Current (unchanged)
0x33 0x34 Swing Arm Current (unchanged)
0x34 0x35 Teleport To Entity Current (unchanged)
0x35 0x36 Use Item On Current (unchanged)
0x36 0x37 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 Villager Data (VarInt, VarInt, VarInt) villager type, villager profession, level (See below.)
19 Optional VarInt VarInt 0 for absent; 1 + actual value otherwise. Used for entity IDs.
20 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 Cat Variant VarInt An ID in the minecraft:cat_variant registry.
22 Frog Variant VarInt An ID in the minecraft:frog_variant registry.
23 Optional Global Position (Boolean, Optional Identifier, Optional Position) dimension identifier, position; only if the Boolean is set to true.
24 Painting Variant VarInt An ID in the minecraft:painting_variant registry.
25 Sniffer State VarInt Enum IDLING = 0, FEELING_HAPPY = 1, SCENTING = 2, SNIFFING = 3, SEARCHING = 4, DIGGING = 5, RISING = 6
26 Armadillo State VarInt Enum IDLE = 0, ROLLING = 1, SCARED = 2
26 27 Vector3 (Float, Float, Float) x, y, z
27 28 Quaternion (Float, Float, Float, Float) x, y, z, w

Armadillo

Extends Animal.

Index Type Meaning Default
17 Armadillo State (26) 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

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 Optional ByteArray(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.

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
0x09 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
0x0A Configuration Client Host String The hostname of IP of the server.
Port VarInt The port of the server.

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 Optional ByteArray(5120) The data of the cookie, if any.

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.

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
0x6A Play Client Key Identifier The identifier of the cookie.
Payload ByteArray(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
0x72 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):

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

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
0x6A 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 Optional ByteArray(5120) The data of the cookie, if any.