Difference between revisions of "Pre-release protocol"

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This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently [[Protocol version numbers|1.8.8, protocol 47]]) to the current pre-release (currently [[Protocol version numbers|15w36c, protocol 69]]). Note that this page contains bleeding-edge information that may not be completely or correctly documented.
+
This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently [[Protocol version numbers|1.16.5, protocol 754]]) to the current pre-release (currently [[Protocol version numbers|21w07a, protocol {{Snapshot PVN|1073741839}}]]). Note that this page contains bleeding-edge information that may not be completely or correctly documented.
  
 
One who wishes to commandeer the merging of this into [[Protocol]] when an update is made must be sure to respect any changes that may have occurred to the respective packets there.
 
One who wishes to commandeer the merging of this into [[Protocol]] when an update is made must be sure to respect any changes that may have occurred to the respective packets there.
__NOTOC__
+
 
 
== Contents ==
 
== Contents ==
 +
 +
<div style="float:right;">__TOC__</div>
  
 
=== Data types ===
 
=== Data types ===
  
* [[#Chunk Section|Chunk Section]]
+
No changes so far.
* [[#Entity Metadata|Entity Metadata]]
 
  
 
=== Packets ===
 
=== Packets ===
Line 15: Line 16:
 
  ! ID
 
  ! ID
 
  ! Packet name
 
  ! Packet name
  ! colspan=2 | Documentation
+
  !colspan="2"| Documentation
 
  |-
 
  |-
! colspan=4 | Handshaking serverbound
+
!colspan="4"| Play clientbound
{{PacketList|0x00|Handshake}}
+
{{PacketList|0x05|Sculk Vibration Signal|rel=added}}
 +
{{PacketList|{{change|0x05|0x06}}|Entity Animation (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x06|0x07}}|Statistics|pre=unchanged}}
 +
{{PacketList|{{change|0x07|0x08}}|Acknowledge Player Digging|pre=unchanged}}
 +
{{PacketList|{{change|0x08|0x09}}|Block Break Animation|pre=unchanged}}
 +
{{PacketList|{{change|0x09|0x0A}}|Block Entity Data|pre=unchanged}}
 +
{{PacketList|{{change|0x0A|0x0B}}|Block Action|pre=unchanged}}
 +
{{PacketList|{{change|0x0B|0x0C}}|Block Change|pre=unchanged}}
 +
{{PacketList|{{change|0x0C|0x0D}}|Boss Bar|pre=unchanged}}
 +
{{PacketList|{{change|0x0D|0x0E}}|Server Difficulty|pre=unchanged}}
 +
{{PacketList|{{change|0x0E|0x0F}}|Chat Message (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x0F|0x10}}|Tab-Complete (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x10|0x11}}|Declare Commands|pre=unchanged}}
 +
{{PacketList|{{change|0x11|0x12}}|Window Confirmation (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x12|0x13}}|Close Window (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x13|0x14}}|Window Items|pre=unchanged}}
 +
{{PacketList|{{change|0x14|0x15}}|Window Property|pre=unchanged}}
 +
{{PacketList|{{change|0x15|0x16}}|Set Slot|pre=unchanged}}
 +
{{PacketList|{{change|0x16|0x17}}|Set Cooldown|pre=unchanged}}
 +
{{PacketList|{{change|0x17|0x18}}|Plugin Message (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x18|0x19}}|Named Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x19|0x1A}}|Disconnect (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x1A|0x1B}}|Entity Status|pre=unchanged}}
 +
{{PacketList|{{change|0x1B|0x1C}}|Explosion|pre=unchanged}}
 +
{{PacketList|{{change|0x1C|0x1D}}|Unload Chunk|pre=unchanged}}
 +
{{PacketList|{{change|0x1D|0x1E}}|Change Game State|pre=unchanged}}
 +
{{PacketList|{{change|0x1E|0x1F}}|Open Horse Window|pre=unchanged}}
 +
{{PacketList|{{change|0x1F|0x20}}|Keep Alive (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x20|0x21}}|Chunk Data}}
 +
{{PacketList|{{change|0x21|0x22}}|Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x22|0x23}}|Particle|pre=unchanged}}
 +
{{PacketList|{{change|0x23|0x24}}|Update Light}}
 +
{{PacketList|{{change|0x24|0x25}}|Join Game|pre=unchanged}}
 +
{{PacketList|{{change|0x25|0x26}}|Map Data}}
 +
{{PacketList|{{change|0x26|0x27}}|Trade List|pre=unchanged}}
 +
{{PacketList|{{change|0x27|0x28}}|Entity Position|pre=unchanged}}
 +
{{PacketList|{{change|0x28|0x29}}|Entity Position and Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x29|0x2A}}|Entity Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x2A|0x2B}}|Entity Movement|pre=unchanged}}
 +
{{PacketList|{{change|0x2B|0x2C}}|Vehicle Move (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x2C|0x2D}}|Open Book|pre=unchanged}}
 +
{{PacketList|{{change|0x2D|0x2E}}|Open Window|pre=unchanged}}
 +
{{PacketList|{{change|0x2E|0x2F}}|Open Sign Editor|pre=unchanged}}
 +
{{PacketList|{{change|0x2F|0x30}}|Craft Recipe Response|pre=unchanged}}
 +
{{PacketList|{{change|0x30|0x31}}|Player Abilities (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x31|0x32}}|Combat Event|pre=unchanged}}
 +
{{PacketList|{{change|0x32|0x33}}|Player Info|pre=unchanged}}
 +
{{PacketList|{{change|0x33|0x34}}|Face Player|pre=unchanged}}
 +
{{PacketList|{{change|0x34|0x35}}|Player Position And Look (clientbound)}}
 +
{{PacketList|{{change|0x35|0x36}}|Unlock Recipes|pre=unchanged}}
 +
{{PacketList|{{change|0x36|0x37}}|Destroy Entities|pre=unchanged}}
 +
{{PacketList|{{change|0x37|0x38}}|Remove Entity Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x38|0x39}}|Resource Pack Send}}
 +
{{PacketList|{{change|0x39|0x3A}}|Respawn|pre=unchanged}}
 +
{{PacketList|{{change|0x3A|0x3B}}|Entity Head Look|pre=unchanged}}
 +
{{PacketList|{{change|0x3B|0x3C}}|Multi Block Change|pre=unchanged}}
 +
{{PacketList|{{change|0x3C|0x3D}}|Select Advancement Tab|pre=unchanged}}
 +
{{PacketList|{{change|0x3D|0x3E}}|World Border|pre=unchanged}}
 +
{{PacketList|{{change|0x3E|0x3F}}|Camera|pre=unchanged}}
 +
{{PacketList|{{change|0x3F|0x40}}|Held Item Change (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x40|0x41}}|Update View Position|pre=unchanged}}
 +
{{PacketList|{{change|0x41|0x42}}|Update View Distance|pre=unchanged}}
 +
{{PacketList|{{change|0x42|0x43}}|Spawn Position|pre=unchanged}}
 +
{{PacketList|{{change|0x43|0x44}}|Display Scoreboard|pre=unchanged}}
 +
{{PacketList|{{change|0x44|0x45}}|Entity Metadata|pre=unchanged}}
 +
{{PacketList|{{change|0x45|0x46}}|Attach Entity|pre=unchanged}}
 +
{{PacketList|{{change|0x46|0x47}}|Entity Velocity|pre=unchanged}}
 +
{{PacketList|{{change|0x47|0x48}}|Entity Equipment|pre=unchanged}}
 +
{{PacketList|{{change|0x48|0x49}}|Set Experience|pre=unchanged}}
 +
{{PacketList|{{change|0x49|0x4A}}|Update Health|pre=unchanged}}
 +
{{PacketList|{{change|0x4A|0x4B}}|Scoreboard Objective|pre=unchanged}}
 +
{{PacketList|{{change|0x4B|0x4C}}|Set Passengers|pre=unchanged}}
 +
{{PacketList|{{change|0x4C|0x4D}}|Teams|pre=unchanged}}
 +
{{PacketList|{{change|0x4D|0x4E}}|Update Score|pre=unchanged}}
 +
{{PacketList|{{change|0x4E|0x4F}}|Time Update|pre=unchanged}}
 +
{{PacketList|{{change|0x4F|0x50}}|Title|pre=unchanged}}
 +
{{PacketList|{{change|0x50|0x51}}|Entity Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x51|0x52}}|Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x52|0x53}}|Stop Sound|pre=unchanged}}
 +
{{PacketList|{{change|0x53|0x54}}|Player List Header And Footer|pre=unchanged}}
 +
{{PacketList|{{change|0x54|0x55}}|NBT Query Response|pre=unchanged}}
 +
{{PacketList|{{change|0x55|0x56}}|Collect Item|pre=unchanged}}
 +
{{PacketList|{{change|0x56|0x57}}|Entity Teleport|pre=unchanged}}
 +
{{PacketList|{{change|0x57|0x58}}|Advancements|pre=unchanged}}
 +
{{PacketList|{{change|0x58|0x59}}|Entity Properties|pre=unchanged}}
 +
{{PacketList|{{change|0x59|0x5A}}|Entity Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x5A|0x5B}}|Declare Recipes|pre=unchanged}}
 +
{{PacketList|{{change|0x5B|0x5C}}|Tags}}
 
  |-
 
  |-
! colspan=4 | Play clientbound
+
!colspan="4"| Play serverbound
{{PacketList|0x00|Keep Alive|pre=unchanged}}
+
{{PacketList|0x05|Client Settings}}
{{PacketList|0x01|Join Game|pre=unchanged}}
 
{{PacketList|0x02|Chat Message|pre=unchanged}}
 
{{PacketList|0x03|Time Update|pre=unchanged}}
 
{{PacketList|0x04|Entity Equipment}}
 
{{PacketList|0x05|Spawn Position|pre=unchanged}}
 
{{PacketList|0x06|Update Health|pre=unchanged}}
 
{{PacketList|0x07|Respawn|pre=unchanged}}
 
{{PacketList|0x08|Player Position And Look|pre=unchanged}}
 
{{PacketList|0x09|Held Item Change|pre=unchanged}}
 
{{PacketList|0x0A|Use Bed|pre=unchanged}}
 
{{PacketList|0x0B|Animation|pre=unchanged}}
 
{{PacketList|0x0C|Spawn Player}}
 
{{PacketList|0x0D|Collect Item|pre=unchanged}}
 
{{PacketList|0x0E|Spawn Object}}
 
{{PacketList|0x0F|Spawn Mob}}
 
{{PacketList|0x10|Spawn Painting|pre=unchanged}}
 
{{PacketList|0x11|Spawn Experience Orb|pre=unchanged}}
 
{{PacketList|0x12|Entity Velocity|pre=unchanged}}
 
{{PacketList|0x13|Destroy Entities|pre=unchanged}}
 
{{PacketList|0x14|Entity|pre=unchanged}}
 
{{PacketList|0x15|Entity Relative Move|pre=unchanged}}
 
{{PacketList|0x16|Entity Look|pre=unchanged}}
 
{{PacketList|0x17|Entity Look And Relative Move|pre=unchanged}}
 
{{PacketList|0x18|Entity Teleport|pre=unchanged}}
 
{{PacketList|0x19|Entity Head Look|pre=unchanged}}
 
{{PacketList|0x1A|Entity Status}}
 
{{PacketList|0x1B|Attach Entity|pre=unchanged}}
 
{{PacketList|0x1C|Entity Metadata|pre=unchanged}}
 
{{PacketList|0x1D|Entity Effect|pre=unchanged}}
 
{{PacketList|0x1E|Remove Entity Effect|pre=unchanged}}
 
{{PacketList|0x1F|Set Experience|pre=unchanged}}
 
{{PacketList|0x20|Entity Properties}}
 
{{PacketList|0x21|Chunk Data}}
 
{{PacketList|0x22|Unload Chunk|rel=added}}
 
{{PacketList|{{Change|0x22|0x23}}|Multi Block Change|pre=unchanged}}
 
{{PacketList|{{Change|0x23|0x24}}|Block Change|pre=unchanged}}
 
{{PacketList|{{Change|0x24|0x25}}|Block Action|pre=unchanged}}
 
{{PacketList|{{Change|0x25|0x26}}|Block Break Animation|pre=unchanged}}
 
{{PacketList|0x26|Map Chunk Bulk|pre=removed}}
 
{{PacketList|0x27|Explosion|pre=unchanged}}
 
{{PacketList|0x28|Effect|pre=unchanged}}
 
{{PacketList|0x29|Sound Effect|pre=unchanged}}
 
{{PacketList|0x2A|Particle|pre=unchanged}}
 
{{PacketList|0x2B|Change Game State|pre=unchanged}}
 
{{PacketList|0x2C|Spawn Global Entity|pre=unchanged}}
 
{{PacketList|0x2D|Open Window|pre=unchanged}}
 
{{PacketList|0x2E|Close Window|pre=unchanged}}
 
{{PacketList|0x2F|Set Slot|pre=unchanged}}
 
{{PacketList|0x30|Window Items|pre=unchanged}}
 
{{PacketList|0x31|Window Property|pre=unchanged}}
 
{{PacketList|0x32|Confirm Transaction|pre=unchanged}}
 
{{PacketList|0x33|Update Sign|pre=unchanged}}
 
{{PacketList|0x34|Maps}}
 
{{PacketList|0x35|Update Block Entity|pre=unchanged}}
 
{{PacketList|0x36|Sign Editor Open|pre=unchanged}}
 
{{PacketList|0x37|Statistics|pre=unchanged}}
 
{{PacketList|0x38|Player List Item|pre=unchanged}}
 
{{PacketList|0x39|Player Abilities|pre=unchanged}}
 
{{PacketList|0x3A|Tab-Complete|pre=unchanged}}
 
{{PacketList|0x3B|Scoreboard Objective|pre=unchanged}}
 
{{PacketList|0x3C|Update Score|pre=unchanged}}
 
{{PacketList|0x3D|Display Scoreboard|pre=unchanged}}
 
{{PacketList|0x3E|Teams|pre=unchanged}}
 
{{PacketList|0x3F|Plugin Message|pre=unchanged}}
 
{{PacketList|0x40|Disconnect|pre=unchanged}}
 
{{PacketList|0x41|Server Difficulty|pre=unchanged}}
 
{{PacketList|0x42|Combat Event}}
 
{{PacketList|0x43|Camera|pre=unchanged}}
 
{{PacketList|0x44|World Border|pre=unchanged}}
 
{{PacketList|0x45|Title|pre=unchanged}}
 
{{PacketList|0x46|Set Compression|pre=unchanged}}
 
{{PacketList|0x47|Player List Header/Footer|pre=unchanged}}
 
{{PacketList|0x48|Resource Pack Send|pre=unchanged}}
 
{{PacketList|0x49|Update Entity NBT|pre=removed}}
 
{{PacketList|0x49|Boss Bar|rel=added}}
 
{{PacketList|0x4A|Set Cooldown|rel=added}}
 
 
  |-
 
  |-
! colspan=4 | Play serverbound
+
!colspan="4"| Handshaking serverbound
{{PacketList|0x00|Keep Alive|rel=Keep Alive 2|pre=unchanged}}
+
{{PacketList|0x00|Handshake}}
{{PacketList|0x01|Chat Message|rel=Chat Message 2|pre=unchanged}}
 
{{PacketList|0x02|Use Entity}}
 
{{PacketList|0x03|Player|pre=unchanged}}
 
{{PacketList|0x04|Player Position|pre=unchanged}}
 
{{PacketList|0x05|Player Look|pre=unchanged}}
 
{{PacketList|0x06|Player Position And Look|rel=Player Position And Look 2|pre=unchanged}}
 
{{PacketList|0x07|Player Digging}}
 
{{PacketList|0x08|Use Item|rel=added}}
 
{{PacketList|{{Change|0x08|0x09}}|Player Block Placement}}
 
{{PacketList|{{Change|0x09|0x0A}}|Held Item Change|rel=Held Item Change 2|pre=unchanged}}
 
{{PacketList|{{Change|0x0A|0x0B}}|Animation|rel=Animation 2}}
 
{{PacketList|{{Change|0x0B|0x0C}}|Entity Action}}
 
{{PacketList|{{Change|0x0C|0x0D}}|Steer Vehicle|pre=unchanged}}
 
{{PacketList|{{Change|0x0D|0x0E}}|Close Window|rel=Close Window 2|pre=unchanged}}
 
{{PacketList|{{Change|0x0E|0x0F}}|Click Window|pre=unchanged}}
 
{{PacketList|{{Change|0x0F|0x10}}|Confirm Transaction|rel=Confirm Transaction 2|pre=unchanged}}
 
{{PacketList|{{Change|0x10|0x11}}|Creative Inventory Action|pre=unchanged}}
 
{{PacketList|{{Change|0x11|0x12}}|Enchant Item|pre=unchanged}}
 
{{PacketList|{{Change|0x12|0x13}}|Update Sign|rel=Update Sign 2}}
 
{{PacketList|{{Change|0x13|0x14}}|Player Abilities|rel=Player Abilities 2|pre=unchanged}}
 
{{PacketList|{{Change|0x14|0x15}}|Tab-Complete|rel=Tab-Complete 2|pre=unchanged}}
 
{{PacketList|{{Change|0x15|0x16}}|Client Settings}}
 
{{PacketList|{{Change|0x16|0x17}}|Client Status}}
 
{{PacketList|{{Change|0x17|0x18}}|Plugin Message|rel=Plugin Message 2|pre=unchanged}}
 
{{PacketList|{{Change|0x18|0x19}}|Spectate|pre=unchanged}}
 
{{PacketList|{{Change|0x19|0x1A}}|Resource Pack Status|pre=unchanged}}
 
|-
 
! colspan=4 | Status clientbound
 
{{PacketList|0x00|Response|pre=unchanged}}
 
{{PacketList|0x01|Pong|pre=unchanged}}
 
|-
 
! colspan=4 | Status serverbound
 
{{PacketList|0x00|Request|pre=unchanged}}
 
{{PacketList|0x01|Ping|pre=unchanged}}
 
|-
 
! colspan=4 | Login clientbound
 
{{PacketList|0x00|Disconnect|rel=Disconnect 2|pre=unchanged}}
 
{{PacketList|0x01|Encryption Request|pre=unchanged}}
 
{{PacketList|0x02|Login Success|pre=unchanged}}
 
{{PacketList|0x03|Set Compression|rel=Set Compression 2|pre=unchanged}}
 
|-
 
! colspan=4 | Login serverbound
 
{{PacketList|0x00|Login Start|pre=unchanged}}
 
{{PacketList|0x01|Encryption Response|pre=unchanged}}
 
 
  |}
 
  |}
  
 
== New/modified data types ==
 
== New/modified data types ==
  
=== Chunk Section ===
+
No changes so far.
  
Format is now:
+
== Entity Metadata ==
  
{| class="wikitable"
+
{{#vardefine:meta_prerelease|1}}
|-
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
| Bits Per Block
 
| Unsigned Byte
 
| How many bits per block in Data Array. If greater than 8 (will be changed to “if 0” in the next snapshot), the Palette Length and Palette fields are omitted and the global palette is used.
 
|-
 
| Palette Length
 
| Optional Unsigned Byte
 
| Length of the following array
 
|-
 
| Palette
 
| Optional Array of VarInt
 
| Mapping of block state IDs in the {{Minecraft Wiki|Data values#Block IDs|global palette}} (<code>type = x >> 4</code>, <code>meta = x & 15</code>) to indices of this array
 
|-
 
| Data Array Length
 
| VarInt
 
| Number of bytes in the following array, divided by 8
 
|-
 
| Data Array
 
| Byte Array
 
| List of indices pointing to state IDs in the Palette
 
|-
 
| Block Light
 
| Byte Array
 
| Half byte per block
 
|-
 
| Sky Light
 
| Optional Byte Array
 
| Only if in the Overworld; half byte per block
 
|}
 
  
=== Entity Metadata ===
+
{{Warning2|Note that other entities have had metadata shifts due to these changes, not shown here.}}
  
Format is now an array of entries, each of which looks like the following:
+
=== Entity ===
  
{| class="wikitable"
+
{{metadata inherit|Entity}}
! Name
 
! Type
 
! Meaning
 
|-
 
| Index
 
| Unsigned Byte
 
| Unique index key determining the meaning of the following value, see the table below. If this is <code>0xff</code> then the it is the end of the Entity Metadata array and no more is read.
 
|-
 
| Type
 
| Optional Unsigned Byte
 
| Only if Index is not <code>0xff</code>; the type of the index, see the table below
 
|-
 
| Value
 
| Optional ''value of Type''
 
| Only if Index is not <code>0xff</code>: the value of the metadata field
 
|}
 
  
 
{| class="wikitable"
 
{| class="wikitable"
! Value of Type field
 
! Type of Value field
 
! Notes
 
|-
 
| 0
 
| Byte
 
|
 
|-
 
| 1
 
| VarInt
 
|
 
|-
 
| 2
 
| Float
 
|
 
|-
 
| 3
 
| String
 
|
 
|-
 
| 4
 
| [[Chat]]
 
|
 
|-
 
| 5
 
| [[Slot]]
 
|
 
|-
 
| 6
 
| Boolean
 
|
 
|-
 
| 7
 
| Vector3F (Array of Float)
 
| 3 elements
 
|-
 
| 8
 
| Position
 
|
 
|-
 
| 9
 
| OptPosition (Boolean + Optional Position)
 
| Position is present if the Boolean is set to true
 
|-
 
| 10
 
| Direction (VarInt)
 
| ???
 
|-
 
| 11
 
| OptUUID (Boolean + Optional UUID)
 
| UUID is present if the Boolean is set to true
 
|}
 
 
{| class="wikitable"
 
! Entity class
 
 
  ! Index
 
  ! Index
 
  ! Type
 
  ! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Default
 +
|-
 +
|rowspan="9"| {{Metadata id|}}
 +
|rowspan="9"| Byte
 +
! Bit mask
 
  ! Meaning
 
  ! Meaning
 +
|rowspan="9"| 0
 
  |-
 
  |-
  |rowspan="5"| Entity
+
  | 0x01
| 0
+
  | Is on fire
| Byte
 
| ''Unknown''
 
|-
 
| 1
 
| VarInt
 
| ''Unknown''
 
|-
 
| 2
 
| String
 
| ''Unknown''
 
|-
 
| 3
 
| Boolean
 
| ''Unknown''
 
|-
 
| 4
 
| Boolean
 
| ''Unknown''
 
|-
 
|rowspan="4"| AreaEffectCloud <sup>extends Entity</sup>
 
| 5
 
| Float
 
| ''Unknown''
 
|-
 
| 6
 
| VarInt
 
| ''Unknown''
 
|-
 
| 7
 
| Boolean
 
| ''Unknown''
 
|-
 
| 8
 
| VarInt
 
| ''Unknown''
 
|-
 
| Arrow <sup>extends Entity</sup>
 
| 5
 
| Byte
 
| ''Unknown''
 
|-
 
| TippedArrow <sup>extends Arrow</sup>
 
| 6
 
| VarInt
 
| ''Unknown''
 
|-
 
|rowspan="3"| Boat <sup>extends Entity</sup>
 
| 5
 
| VarInt
 
| ''Unknown''
 
|-
 
| 6
 
| VarInt
 
| ''Unknown''
 
|-
 
| 7
 
| Float
 
| ''Unknown''
 
|-
 
| EnderCrystal <sup>extends Entity</sup>
 
| 5
 
| OptPosition
 
| ''Unknown''
 
|-
 
| Fireball <sup>extends Entity</sup>
 
|colspan="3"| ''no additional metadata''
 
|-
 
| WitherSkull <sup>extends Fireball</sup>
 
| 5
 
| Boolean
 
| ''Unknown''
 
|-
 
| Fireworks <sup>extends Entity</sup>
 
| 5
 
| [[Slot]]
 
| ''Unknown''
 
|-
 
| Hanging <sup>extends Entity</sup>
 
|colspan="3"| ''no additional metadata''
 
|-
 
|rowspan="2"| ItemFrame <sup>extends Hanging</sup>
 
| 5
 
| [[Slot]]
 
| ''Unknown''
 
|-
 
| 6
 
| VarInt
 
| ''Unknown''
 
|-
 
| Item <sup>extends Entity</sup>
 
| 5
 
| [[Slot]]
 
| ''Unknown''
 
|-
 
|rowspan="5"| Living <sup>extends Entity</sup>
 
| 5
 
| Byte
 
| ''Unknown''
 
|-
 
| 6
 
| Float
 
| ''Unknown''
 
|-
 
| 7
 
| VarInt
 
| ''Unknown''
 
|-
 
| 8
 
| Boolean
 
| ''Unknown''
 
|-
 
| 9
 
| VarInt
 
| ''Unknown''
 
|-
 
|rowspan="7"| ArmorStand <sup>extends Living</sup>
 
| 10
 
| Byte
 
| ''Unknown''
 
|-
 
| 11
 
| Vector3F
 
| ''Unknown''
 
|-
 
| 12
 
| Vector3F
 
  | ''Unknown''
 
 
  |-
 
  |-
  | 13
+
  | 0x02
  | Vector3F
+
  | Is crouching
| ''Unknown''
 
 
  |-
 
  |-
  | 14
+
  | 0x04
  | Vector3F
+
  | Unused (previously riding)
| ''Unknown''
 
|-
 
| 15
 
| Vector3F
 
| ''Unknown''
 
|-
 
| 16
 
| Vector3F
 
| ''Unknown''
 
|-
 
| Insentient <sup>extends Living</sup>
 
| 10
 
| Byte
 
| ''Unknown''
 
|-
 
| Ambient <sup>extends Insentient</sup>
 
|colspan="3"| ''no additional metadata''
 
|-
 
| Bat <sup>extends Ambient</sup>
 
| 11
 
| Byte
 
| ''Unknown''
 
 
  |-
 
  |-
  | Creature <sup>extends Insentient</sup>
+
  | 0x08
  |colspan="3"| ''no additional metadata''
+
  | Is sprinting
 
  |-
 
  |-
  | Ageable <sup>extends Creature</sup>
+
  | 0x10
  | 11
+
  | Is swimming
| Boolean
 
| ''Unknown''
 
 
  |-
 
  |-
  | Animal <sup>extends Ageable</sup>
+
  | 0x20
  |colspan="3"| ''no additional metadata''
+
  | Is invisible
 
  |-
 
  |-
  |rowspan="5"| Horse <sup>extends Animal</sup>
+
  | 0x40
| 12
+
  | has glowing effect
| Byte
 
  | ''Unknown''
 
 
  |-
 
  |-
  | 13
+
  | 0x80
  | VarInt
+
  | Is flying with an {{Minecraft Wiki|elytra}}
| ''Unknown''
 
 
  |-
 
  |-
  | 14
+
  | {{Metadata id|}}
 
  | VarInt
 
  | VarInt
  | ''Unknown''
+
  |colspan="2"| Air ticks
 +
| 300
 
  |-
 
  |-
  | 15
+
  | {{Metadata id|}}
  | OptUUID
+
  | OptChat
  | ''Unknown''
+
|colspan="2"| Custom name
 +
  | empty
 
  |-
 
  |-
  | 16
+
  | {{Metadata id|}}
| VarInt
 
| ''Unknown''
 
|-
 
| Pig <sup>extends Animal</sup>
 
| 12
 
 
  | Boolean
 
  | Boolean
  | ''Unknown''
+
  |colspan="2"| Is custom name visible
|-
+
  | false
| Rabbit <sup>extends Animal</sup>
 
| 12
 
| VarInt
 
| ''Unknown''
 
|-
 
| Sheep <sup>extends Animal</sup>
 
| 12
 
| Byte
 
| ''Unknown''
 
|-
 
|rowspan="2"| TameableAnimal <sup>extends Animal</sup>
 
| 12
 
| Byte
 
| ''Unknown''
 
|-
 
| 13
 
| OptUUID
 
  | ''Unknown''
 
 
  |-
 
  |-
  | Ocelot <sup>extends TameableAnimal</sup>
+
  | {{Metadata id|}}
| 14
 
| VarInt
 
| ''Unknown''
 
|-
 
|rowspan="3"| Wolf <sup>extends TameableAnimal</sup>
 
| 14
 
| Float
 
| ''Unknown''
 
|-
 
| 15
 
 
  | Boolean
 
  | Boolean
| ''Unknown''
+
  |colspan="2"| Is silent
|-
+
  | false
| 16
 
| VarInt
 
| ''Unknown''
 
|-
 
| Villager <sup>extends Ageable</sup>
 
| 12
 
| VarInt
 
| ''Unknown''
 
|-
 
| Golem <sup>extends Creature</sup>
 
  |colspan="3"| ''no additional metadata''
 
|-
 
| IronGolem <sup>extends Golem</sup>
 
| 11
 
| Byte
 
| ''Unknown''
 
|-
 
|rowspan="3"| Shulker <sup>extends Golem</sup>
 
| 11
 
| Direction
 
  | ''Unknown''
 
 
  |-
 
  |-
  | 12
+
  | {{Metadata id|}}
| OptPosition
 
| ''Unknown''
 
|-
 
| 13
 
| Byte
 
| ''Unknown''
 
|-
 
| Monster <sup>extends Creature</sup>
 
|colspan="3"| ''no additional metadata''
 
|-
 
| Blaze <sup>extends Monster</sup>
 
| 11
 
| Byte
 
| ''Unknown''
 
|-
 
|rowspan="3"| Creeper <sup>extends Monster</sup>
 
| 11
 
| VarInt
 
| ''Unknown''
 
|-
 
| 12
 
 
  | Boolean
 
  | Boolean
  | ''Unknown''
+
  |colspan="2"| Has no gravity
 +
| false
 
  |-
 
  |-
  | 13
+
  | {{Metadata id|}}
| Boolean
+
  | Pose
  | ''Unknown''
+
  |colspan="2"| Pose
  |-
+
  | STANDING
|rowspan="2"| Guardian <sup>extends Monster</sup>
+
  |- {{added}}
  | 11
+
  | {{Metadata id|added}}
  | Byte
 
  | ''Unknown''
 
|-
 
| 12
 
 
  | VarInt
 
  | VarInt
| ''Unknown''
+
  |colspan="2"| Ticks frozen in powdered snow
|-
+
  | 0
|rowspan="2"| Skeleton <sup>extends Monster</sup>
 
| 11
 
| VarInt
 
| ''Unknown''
 
|-
 
| 12
 
| Boolean
 
| ''Unknown''
 
|-
 
| Spider <sup>extends Monster</sup>
 
| 11
 
| Byte
 
| ''Unknown''
 
|-
 
| Witch <sup>extends Monster</sup>
 
| 11
 
| Boolean
 
| ''Unknown''
 
|-
 
|rowspan="4"| Wither <sup>extends Monster</sup>
 
| 11
 
| VarInt
 
| ''Unknown''
 
|-
 
| 12
 
| VarInt
 
| ''Unknown''
 
|-
 
| 13
 
| VarInt
 
| ''Unknown''
 
|-
 
| 14
 
| VarInt
 
| ''Unknown''
 
|-
 
|rowspan="3"| Zombie <sup>extends Monster</sup>
 
| 11
 
| Boolean
 
| ''Unknown''
 
|-
 
| 12
 
| Boolean
 
| ''Unknown''
 
|-
 
| 13
 
| Boolean
 
| ''Unknown''
 
|-
 
| EnderDragon <sup>extends Insentient</sup>
 
| 11
 
| VarInt
 
| ''Unknown''
 
|-
 
| Flying <sup>extends Insentient</sup>
 
  |colspan="3"| ''no additional metadata''
 
|-
 
| Ghast <sup>extends Flying</sup>
 
| 11
 
| Boolean
 
| ''Unknown''
 
|-
 
| Slime <sup>extends Insentient</sup>
 
| 11
 
| VarInt
 
| ''Unknown''
 
|-
 
|rowspan="6"| Minecart <sup>extends Entity</sup>
 
| 5
 
| VarInt
 
| ''Unknown''
 
|-
 
| 6
 
| VarInt
 
| ''Unknown''
 
|-
 
| 7
 
| Float
 
| ''Unknown''
 
|-
 
| 8
 
| VarInt
 
| ''Unknown''
 
|-
 
| 9
 
| VarInt
 
| ''Unknown''
 
|-
 
| 10
 
| Boolean
 
| ''Unknown''
 
|-
 
|rowspan="2"| MinecartCommandBlock <sup>extends Minecart</sup>
 
| 11
 
| String
 
| ''Unknown''
 
|-
 
| 12
 
| [[Chat]]
 
| ''Unknown''
 
|-
 
| MinecartFurnace <sup>extends Minecart</sup>
 
| 11
 
| Boolean
 
| ''Unknown''
 
|-
 
| TNTPrimed <sup>extends Entity</sup>
 
| 5
 
| VarInt
 
  | ''Unknown''
 
 
  |}
 
  |}
  
Entity classes also recursively use fields from classes they extend.
+
== Block Actions ==
  
== Handshaking ==
+
No changes so far.
  
=== Clientbound ===
+
== Inventories ==
  
 
No changes so far.
 
No changes so far.
  
=== Serverbound ===
+
== Plugin Channels ==
  
==== Handshake ====
+
No changes so far.
 
 
This causes the server to switch into the target state.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="4"| 0x00
 
|rowspan="4"| Handshaking
 
|rowspan="4"| Server
 
| Protocol Version
 
| VarInt
 
| See [[protocol version numbers]] (currently {{Change|47|69}})
 
|-
 
| Server Address
 
| String
 
| hostname or IP, e.g. localhost or 127.0.0.1<!-- does this support IPv6? -->
 
|-
 
| Server Port
 
| Unsigned Short
 
| default is 25565
 
|-
 
| Next State
 
| VarInt
 
| 1 for [[#Status|status]], 2 for [[#Login|login]]
 
|}
 
  
 
== Play ==
 
== Play ==
Line 717: Line 217:
 
=== Clientbound ===
 
=== Clientbound ===
  
==== Entity Equipment ====
+
==== Sculk Vibration Signal ====
  
{| class="wikitable"
+
{| class="wikitable" {{Added}}
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
Line 727: Line 227:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x04
+
  |rowspan="4"| 0x05
  |rowspan="3"| Play
+
  |rowspan="4"| Play
  |rowspan="3"| Client
+
  |rowspan="4"| Client
  | Entity ID
+
  | Source Position
  | VarInt
+
  | Position
  | Entity's EID
+
  | Source position for the vibration.
 
  |-
 
  |-
  | Slot
+
  | Destination Identifier
  | {{Change|Short|VarInt}}
+
  | Identifier
  | Equipment slot. 0: main hand, {{Change||1: off hand}}, {{Change|1–4|2–5}}: armor slot (2: boots, 3: leggings, 4: chestplate, 5: helmet)
+
  | Identifier of the destination codec type.
 
  |-
 
  |-
  | Item
+
  | Destination
  | [[Slot Data|Slot]]
+
  | Varies
  | Item in slot format
+
  | Vanilla default destinations are a block position encoded as a [https://wiki.vg/Protocol#Data_types Position] for "block" or an entity id encoded as a VarInt for "entity".
|}
 
 
 
==== Spawn Player ====
 
 
 
This packet is sent by the server when a player comes into visible range, ''not'' when a player joins.
 
 
 
This packet must be sent after the [[Protocol#Player List Item|Player List Item]] ([[#Play|Play]], 0x38, clientbound) packet that adds the player data for the client to use when spawning a player. The tab includes skin/cape data.
 
 
 
Servers can, however, safely spawn player entities for players not in visible range. The client appears to handle it correctly.
 
 
 
When in online-mode the UUIDs must be valid and have valid skin blobs, in offline-mode UUID v3 is used.
 
 
 
For NPCs UUID v2 should be used. Note:
 
 
 
<+Grum> i will never confirm this as a feature you know that :)
 
 
 
In an example UUID, <code>xxxxxxxx-xxxx-Yxxx-xxxx-xxxxxxxxxxxx</code>, the UUID version is specified by <code>Y</code>. So, for UUID v3, <code>Y</code> will always be <code>3</code>, and for UUID v2, <code>Y</code> will always be <code>2</code>.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="9"| 0x0C
+
  | Arrival Ticks
|rowspan="9"| Play
 
|rowspan="9"| Client
 
| Entity ID
 
 
  | VarInt
 
  | VarInt
  | Player's EID
+
  | Ticks for the signal to arrive at the destination.
|-
 
| Player UUID
 
| UUID
 
|
 
|-
 
| X
 
| Int
 
| Player X as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
 
|-
 
| Y
 
| Int
 
| Player Y as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
 
|-
 
| Z
 
| Int
 
| Player Z as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
 
|-
 
| Yaw
 
| Angle
 
|
 
|-
 
| Pitch
 
| Angle
 
|
 
|- style="background-color: #f4cccc; text-decoration: line-through;"
 
| Current Item
 
| Short
 
| The item the player is currently holding. Note that this should be 0 for “no item”, unlike -1 used in other packets.
 
|-
 
| Metadata
 
| [[#Entity Metadata|Entity Metadata]]
 
|
 
 
  |}
 
  |}
 +
This packet shows a permanent particle.
  
==== Spawn Object ====
+
==== Chunk Data ====
 +
{{Main|Chunk Format}}
 +
{{See also|#Unload Chunk}}
  
Sent by the server when an object/vehicle is created.
+
{{Need Info|How do biomes work now?  The biome change happened at the same time as the seed change, but it's not clear how/if biomes could be computed given that it's not the actual seed...  ([https://www.reddit.com/r/Mojira/comments/e5at6i/a_discussion_for_the_changes_to_how_biomes_are/ /r/mojira discussion] which notes that it seems to be some kind of interpolation, and 3D biomes are only used in the nether)}}
  
{| class="wikitable"
+
The server only sends skylight information for chunk pillars in the {{Minecraft Wiki|Overworld}}, it's up to the client to know in which dimension the player is currently located. You can also infer this information from the primary bitmask and the amount of uncompressed bytes sent. This packet also sends all block entities in the chunk (though sending them is not required; it is still legal to send them with [[#Update Block Entity|Update Block Entity]] later).
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="13"| 0x0E
 
|rowspan="13"| Play
 
|rowspan="13"| Client
 
| Entity ID
 
| VarInt
 
  | EID of the object
 
|- style="background-color: #d9ead3;"
 
| Object UUID
 
| UUID
 
|
 
|-
 
| Type
 
| Byte
 
| The type of object (See [[Entities#Objects]])
 
|-
 
| X
 
| Int
 
| X position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
 
|-
 
| Y
 
| Int
 
| Y position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
 
|-
 
| Z
 
| Int
 
| Z position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
 
|-
 
| Pitch
 
| Angle
 
|
 
|-
 
| Yaw
 
| Angle
 
|
 
|- style="background-color: #f4cccc; text-decoration: line-through;"
 
| Data
 
| [[Object Data]]
 
|
 
|-  style="background-color: #d9ead3;"
 
| Info
 
| Int
 
| Depends on Type; see [[Object Data#Meaning of int field]]
 
|-  style="background-color: #d9ead3;"
 
| Velocity X
 
| Short
 
|
 
|-  style="background-color: #d9ead3;"
 
| Velocity Y
 
| Short
 
|
 
|-  style="background-color: #d9ead3;"
 
| Velocity Z
 
| Short
 
 
|}
 
 
 
==== Spawn Mob ====
 
 
 
Sent by the server when a mob entity is spawned.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 887: Line 264:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="13"| 0x0F
+
  |rowspan="13"| {{change|0x20|0x21}}
 
  |rowspan="13"| Play
 
  |rowspan="13"| Play
 
  |rowspan="13"| Client
 
  |rowspan="13"| Client
| Entity ID
 
| VarInt
 
|
 
|- style="background-color: #d9ead3;"
 
| Entity UUID
 
| UUID
 
|
 
|-
 
| Type
 
| Unsigned Byte
 
| The type of mob. See [[Entities#Mobs]]
 
|-
 
| X
 
| Int
 
| X position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
 
|-
 
| Y
 
| Int
 
| Y position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
 
|-
 
| Z
 
| Int
 
| Z position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
 
|-
 
| Yaw
 
| Angle
 
|
 
|-
 
| Pitch
 
| Angle
 
|
 
|-
 
| Head Pitch
 
| Angle
 
|
 
|-
 
| Velocity X
 
| Short
 
| Same units as [[Protocol#Entity Velocity|Entity Velocity]]
 
|-
 
| Velocity Y
 
| Short
 
| Same units as [[Protocol#Entity Velocity|Entity Velocity]]
 
|-
 
| Velocity Z
 
| Short
 
| Same units as [[Protocol#Entity Velocity|Entity Velocity]]
 
|-
 
| Metadata
 
| [[#Entity Metadata|Entity Metadata]]
 
|
 
|}
 
 
==== Entity Status ====
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="2"| 0x1A
 
|rowspan="2"| Play
 
|rowspan="2"| Client
 
| Entity ID
 
| Int
 
|
 
|-
 
| Entity Status
 
| Byte
 
| See below
 
|}
 
 
{| class="wikitable"
 
|-
 
! Entity Status
 
! Meaning
 
|-
 
| 1
 
| Sent when resetting a mob spawn minecart's timer — appears to be unused by the client
 
|-
 
| 2
 
| Living Entity hurt
 
|-
 
| 3
 
| Living Entity dead
 
|-
 
| 4
 
| Iron Golem throwing up arms
 
|-
 
| 6
 
| Wolf/Ocelot/Horse taming — Spawn “heart” particles
 
|-
 
| 7
 
| Wolf/Ocelot/Horse tamed — Spawn “smoke” particles
 
|-
 
| 8
 
| Wolf shaking water — Trigger the shaking animation
 
|-
 
| 9
 
| (of self) Eating accepted by server
 
|-
 
| 10
 
| Sheep eating grass
 
|-
 
| 10
 
| Play TNT ignite sound
 
|-
 
| 11
 
| Iron Golem handing over a rose
 
|-
 
| 12
 
| Villager mating — Spawn “heart” particles
 
|-
 
| 13
 
| Spawn particles indicating that a villager is angry and seeking revenge
 
|-
 
| 14
 
| Spawn happy particles near a villager
 
|-
 
| 15
 
| Witch animation — Spawn “magic” particles
 
|-
 
| 16
 
| Play zombie converting into a villager sound
 
|-
 
| 17
 
| Firework exploding
 
|-
 
| 18
 
| Animal in love (ready to mate) — Spawn “heart” particles
 
|-
 
| 19
 
| Reset squid rotation
 
|-
 
| 20
 
| Spawn explosion particle — works for some living entities
 
|-
 
| 21
 
| Play guardian sound — works for every entity
 
|-
 
| 22
 
| Enables reduced {{Minecraft Wiki|Debug screen|debug}} for players
 
|-
 
| 23
 
| Disables reduced {{Minecraft Wiki|Debug screen|debug}} for players
 
|- style="background-color: #d9ead3;"
 
| 24–28
 
| Sets {{Minecraft Wiki|Server.properties#op-permission-level|op permission level}} 0–4 for players
 
|}
 
 
==== Entity Properties ====
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
!colspan="2"| Field Name
 
!colspan="2"| Field Type
 
! Notes
 
|-
 
|rowspan="6"| 0x20
 
|rowspan="6"| Play
 
|rowspan="6"| Client
 
|colspan="2"| Entity ID
 
|colspan="2"| VarInt
 
|
 
|-
 
|colspan="2"| Number Of Properties
 
|colspan="2"| Int
 
| Number of elements in the following array
 
|-
 
|rowspan="4"| Property
 
| Key
 
|rowspan="4"| Array
 
| String
 
| See below
 
|-
 
| Value
 
| Double
 
| See below
 
|-
 
| Number Of Modifiers
 
| VarInt
 
| Number of elements in the following array
 
|-
 
| Modifiers
 
| Array of Modifier Data
 
| See {{Minecraft Wiki|Attribute#Modifiers}}
 
|}
 
 
Known Key values:
 
 
{| class="wikitable"
 
|-
 
! Key
 
! Default
 
! Min
 
! Max
 
! Label
 
|-
 
| generic.maxHealth
 
| 20.0
 
| 0.0
 
| {{Change|Double.MaxValue|1024.0}}
 
| Max Health
 
|-
 
| generic.followRange
 
| 32.0
 
| 0.0
 
| 2048.0
 
| Follow Range
 
|-
 
| generic.knockbackResistance
 
| 0.0
 
| 0.0
 
| 1.0
 
| Knockback Resistance
 
|-
 
| generic.movementSpeed
 
| 0.699999988079071
 
| 0.0
 
| {{Change|Double.MaxValue|1024.0}}
 
| Movement Speed
 
|-
 
| generic.attackDamage
 
| 2.0
 
| 0.0
 
| {{Change|Double.MaxValue|2048.0}}
 
| {{Change||Attack Damage}}
 
|- style="background-color: #d9ead3;"
 
| generic.attackSpeed
 
| 4.0
 
| 0.0
 
| 1024.0
 
| Attack Speed
 
|-
 
| horse.jumpStrength
 
| 0.7
 
| 0.0
 
| 2.0
 
| Jump Strength
 
|-
 
| zombie.spawnReinforcements
 
| 0.0
 
| 0.0
 
| 1.0
 
| Spawn Reinforcements Chance
 
|}
 
 
''Modifier Data'' structure:
 
 
{| class="wikitable"
 
|-
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
| UUID
 
| UUID
 
|
 
|-
 
| Amount
 
| Double
 
|
 
|-
 
| Operation
 
| Byte
 
|
 
|}
 
 
==== Chunk Data ====
 
 
Chunk pillars are not unloaded by the client automatically. To unload chunk pillars, {{Change|send this packet with Ground-Up Continuous{{=}}true and no 16^3 chunks (eg. Primary Bit Mask{{=}}0)|send an [[#Unload Chunk|Unload Chunk]] packet with the chunk's X and Z coordinates}}. The server only sends skylight information for chunk pillars in the Overworld, it's up to the client to know in which dimenison the player is currently located. You can also infer this information from the primary bitmask and the amount of uncompressed bytes sent.
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="7"| 0x21
 
|rowspan="7"| Play
 
|rowspan="7"| Client
 
 
  | Chunk X
 
  | Chunk X
 
  | Int
 
  | Int
  | Chunk X coordinate
+
  | Chunk coordinate (block coordinate divided by 16, rounded down)
 
  |-
 
  |-
 
  | Chunk Z
 
  | Chunk Z
 
  | Int
 
  | Int
  | Chunk Z coordinate
+
  | Chunk coordinate (block coordinate divided by 16, rounded down)
 +
|- {{removed}}
 +
| Full chunk
 +
| Boolean
 +
| See [[Chunk Format#Full chunk|Chunk Format]]
 +
|- {{removed}}
 +
| Primary Bit Mask
 +
| VarInt
 +
| Bitmask with bits set to 1 for every 16×16×16 chunk section whose data is included in Data. The least significant bit represents the chunk section at the bottom of the chunk column (from y=0 to y=15).
 +
|- {{added}}
 +
| Bit Mask Length
 +
| VarInt
 +
| Length of the following array
 +
|- {{added}}
 +
| Primary Bit Mask
 +
| Array of Long
 +
| BitSet with bits (world height in blocks / 16) set to 1 for every 16×16×16 chunk section whose data is included in Data. The least significant bit represents the chunk section at the bottom of the chunk column (from the lowest y to 15 blocks above).
 
  |-
 
  |-
  | Ground-Up Continuous
+
  | Heightmaps
  | Boolean
+
  | [[NBT]]
  | This is true if the packet represents all chunk sections in this vertical chunk column, where the Primary Bit Mask specifies exactly which chunk sections are included, and which are air.
+
  | Compound containing one long array named <code>MOTION_BLOCKING</code>, which is a heightmap for the highest solid block at each position in the chunk (as a compacted long array with 256 entries at 9 bits per entry totaling 36 longs). The Notchian server also adds a <code>WORLD_SURFACE</code> long array, the purpose of which is unknown, but it's not required for the chunk to be accepted.
 +
|-
 +
| Biomes length
 +
| {{change|Optional|}} VarInt
 +
| Size of the following array; should always be 1024.  {{change|Not present if full chunk is false.|}}
 
  |-
 
  |-
  | Primary Bit Mask
+
  | Biomes
  | {{Change|Unsigned Short|Unsigned Int}}
+
  | {{change|Optional|}} Array of VarInt
  | Bitmask with bits set to 1 for every 16×16×16 chunk section whose data follows in the compressed data. The least significant bit represents the chunk section at the bottom of the chunk column (from y=0 to y=15). Will change to a VarInt in the next snapshot.
+
  | 1024 biome IDs, ordered by x then z then y, in 4&times;4&times;4 blocks. {{change|Not present if full chunk is false.|}}  See [[Chunk Format#Biomes|Chunk Format § Biomes]].
 
  |-  
 
  |-  
 
  | Size
 
  | Size
Line 1,199: Line 308:
 
  |-
 
  |-
 
  | Data
 
  | Data
  | Array of [[#Chunk Section|Chunk Section]]
+
  | Byte array
| The length of the array is equal to the number of bits set in Primary Bit Mask.
+
| See [[Chunk Format#Data structure|data structure]] in Chunk Format
 
  |-
 
  |-
  | Biomes
+
  | Number of block entities
  | Optional Byte Array
+
| VarInt
  | Only if Ground-Up Continuous: biome array, byte per XZ coordinate, 256 bytes total.
+
| Number of elements in the following array
 +
|-
 +
| Block entities
 +
  | Array of [[NBT|NBT Tag]]
 +
  | All block entities in the chunk.  Use the x, y, and z tags in the NBT to determine their positions.
 
  |}
 
  |}
  
==== {{Change||Unload Chunk}} ====
+
Note that the Notchian client requires an [[#Update View Position|Update View Position]] packet when it crosses a chunk border, otherwise it'll only display render distance + 2 chunks around the chunk it spawned in.
  
Tells the client to unload a chunk.
+
The compacted array format has been adjusted so that individual entries no longer span across multiple longs, affecting the main data array and heightmaps.
  
{| class="wikitable"
+
New format, 5 bits per block, containing the following references to blocks in a palette (not shown): <span style="border: solid 2px hsl(0, 90%, 60%)">1</span><span style="border: solid 2px hsl(30, 90%, 60%)">2</span><span style="border: solid 2px hsl(60, 90%, 60%)">2</span><span style="border: solid 2px hsl(90, 90%, 60%)">3</span><span style="border: solid 2px hsl(120, 90%, 60%)">4</span><span style="border: solid 2px hsl(150, 90%, 60%)">4</span><span style="border: solid 2px hsl(180, 90%, 60%)">5</span><span style="border: solid 2px hsl(210, 90%, 60%)">6</span><span style="border: solid 2px hsl(240, 90%, 60%)">6</span><span style="border: solid 2px hsl(270, 90%, 60%)">4</span><span style="border: solid 2px hsl(300, 90%, 60%)">8</span><span style="border: solid 2px hsl(330, 90%, 60%)">0</span><span style="border: solid 2px hsl(0, 90%, 30%)">7</span><span style="border: solid 2px hsl(30, 90%, 30%)">4</span><span style="border: solid 2px hsl(60, 90%, 30%)">3</span><span style="border: solid 2px hsl(90, 90%, 30%)">13</span><span style="border: solid 2px hsl(120, 90%, 30%)">15</span><span style="border: solid 2px hsl(150, 90%, 30%)">16</span><span style="border: solid 2px hsl(180, 90%, 30%)">9</span><span style="border: solid 2px hsl(210, 90%, 30%)">14</span><span style="border: solid 2px hsl(240, 90%, 30%)">10</span><span style="border: solid 2px hsl(270, 90%, 30%)">12</span><span style="border: solid 2px hsl(300, 90%, 30%)">0</span><span style="border: solid 2px hsl(330, 90%, 30%)">2</span>
! Packet ID
+
 
! State
+
<code>0020863148418841</code> <code><span style="outline: dashed 2px black">0000</span><span style="outline: solid 2px hsl(330, 90%, 60%)">00000</span><span style="outline: solid 2px hsl(300, 90%, 60%)">01000</span><span style="outline: solid 2px hsl(270, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(240, 90%, 60%)">00110</span><span style="outline: solid 2px hsl(210, 90%, 60%)">00110</span><span style="outline: solid 2px hsl(180, 90%, 60%)">00101</span><span style="outline: solid 2px hsl(150, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(120, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(90, 90%, 60%)">00011</span><span style="outline: solid 2px hsl(60, 90%, 60%)">00010</span><span style="outline: solid 2px hsl(30, 90%, 60%)">00010</span><span style="outline: solid 2px hsl(0, 90%, 60%)">00001</span></code><br>
! Bound To
+
<code>01018A7260F68C87</code> <code><span style="outline: dashed 2px black">0000</span><span style="outline: solid 2px hsl(330, 90%, 30%)">00010</span><span style="outline: solid 2px hsl(300, 90%, 30%)">00000</span><span style="outline: solid 2px hsl(270, 90%, 30%)">01100</span><span style="outline: solid 2px hsl(240, 90%, 30%)">01010</span><span style="outline: solid 2px hsl(210, 90%, 30%)">01110</span><span style="outline: solid 2px hsl(180, 90%, 30%)">01001</span><span style="outline: solid 2px hsl(150, 90%, 30%)">10000</span><span style="outline: solid 2px hsl(120, 90%, 30%)">01111</span><span style="outline: solid 2px hsl(90, 90%, 30%)">01101</span><span style="outline: solid 2px hsl(60, 90%, 30%)">00011</span><span style="outline: solid 2px hsl(30, 90%, 30%)">00100</span><span style="outline: solid 2px hsl(0, 90%, 30%)">00111</span></code>
! Field Name
+
 
! Field Type
+
==== Update Light ====
! Notes
+
 
|-
+
Updates light levels for a chunk.
|rowspan="2"| 0x22
 
|rowspan="2"| Play
 
|rowspan="2"| Client
 
| Chunk X
 
| Int
 
| Chunk X coordinate
 
|-
 
| Chunk Z
 
| Int
 
| Chunk Z coordinate
 
|}
 
  
==== Multi Block Change ====
 
Fired whenever 2 or more blocks are changed within the render distance.
 
 
{| class="wikitable"
 
{| class="wikitable"
 
  ! Packet ID
 
  ! Packet ID
Line 1,241: Line 341:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="6"| {{Change|0x22|0x23}}
+
  |rowspan="21"| {{change|0x23|0x24}}
  |rowspan="6"| Play
+
  |rowspan="21"| Play
  |rowspan="6"| Client
+
  |rowspan="21"| Client
 
  |colspan="2"| Chunk X
 
  |colspan="2"| Chunk X
  |colspan="2"| Int
+
  |colspan="2"| VarInt
  | Chunk X coordinate
+
  | Chunk coordinate (block coordinate divided by 16, rounded down)
 
  |-
 
  |-
 
  |colspan="2"| Chunk Z
 
  |colspan="2"| Chunk Z
  |colspan="2"| Int
+
  |colspan="2"| VarInt
  | Chunk Z coordinate
+
  | Chunk coordinate (block coordinate divided by 16, rounded down)
 
  |-
 
  |-
  |colspan="2"| Record Count
+
  |colspan="2"| Trust Edges
 +
|colspan="2"| Boolean
 +
| If edges should be trusted for light updates.
 +
|- {{removed}}
 +
|colspan="2"| Sky Light Mask
 +
|colspan="2"| VarInt
 +
| Mask containing 18 bits, with the lowest bit corresponding to chunk section -1 (in the void, y=-16 to y=-1) and the highest bit for chunk section 16 (above the world, y=256 to y=271)
 +
|- {{removed}}
 +
|colspan="2"| Block Light Mask
 +
|colspan="2"| VarInt
 +
| Mask containing 18 bits, with the same order as sky light
 +
|- {{removed}}
 +
|colspan="2"| Empty Sky Light Mask
 +
|colspan="2"| VarInt
 +
| Mask containing 18 bits, which indicates sections that have 0 for all their sky light values.  If a section is set in both this mask and the main sky light mask, it is ignored for this mask and it is included in the sky light arrays (the notchian server does not create such masks).  If it is only set in this mask, it is not included in the sky light arrays.
 +
|- {{removed}}
 +
|colspan="2"| Empty Block Light Mask
 +
|colspan="2"| VarInt
 +
| Mask containing 18 bits, which indicates sections that have 0 for all their block light values.  If a section is set in both this mask and the main block light mask, it is ignored for this mask and it is included in the block light arrays (the notchian server does not create such masks).  If it is only set in this mask, it is not included in the block light arrays.
 +
|- {{Added}}
 +
|colspan="2"| Length 1
 +
|colspan="2"| VarInt
 +
| Length of the following array
 +
|- {{Added}}
 +
|colspan="2"| Sky Light Mask
 +
|colspan="2"| Array of Long
 +
| BitSet containing bits for each sections in the world + 2 (lowest bit 16-1 blocks below min world height, highest 1-16 above max world height)
 +
|- {{Added}}
 +
|colspan="2"| Length 2
 +
|colspan="2"| VarInt
 +
| Length of the following array
 +
|- {{Added}}
 +
|colspan="2"| Block Light Mask
 +
|colspan="2"| Array of Long
 +
| BitSet containing bits for each sections in the world + 2, same order as sky light
 +
|- {{Added}}
 +
|colspan="2"| Length 3
 +
|colspan="2"| VarInt
 +
| Length of the following array
 +
|- {{Added}}
 +
|colspan="2"| Empty Sky Light Mask
 +
|colspan="2"| Array of Long
 +
| BitSet containing a variable amount of bits (see sky/block light) which indicates sections that have 0 for all their sky light values
 +
|- {{Added}}
 +
|colspan="2"| Length 4
 +
|colspan="2"| VarInt
 +
| Length of the following array
 +
|- {{Added}}
 +
|colspan="2"| Empty Block Light Mask
 +
|colspan="2"| Array of Long
 +
| BitSet containing a variable amount of bits (see sky/block light) which indicates sections that have 0 for all their block light values
 +
|- {{added}}
 +
|colspan="2"| Sky Light array count
 
  |colspan="2"| VarInt
 
  |colspan="2"| VarInt
  | Number of elements in the following array, i.e. the number of blocks affected
+
  | Number of entries in the following array
 
  |-
 
  |-
  |rowspan="3"| Record
+
  |rowspan="2"| Sky Light arrays
  | Horizontal Position
+
  | Length
  |rowspan="3"| Array
+
  |rowspan="2"| Array
| Unsigned Byte
 
| The 4 most significant bits (<code>0xF0</code>) encode the X coordinate, relative to the chunk. The 4 least significant bits (<code>0x0F</code>) encode the Z coordinate, relative to the chunk.
 
|-
 
| Y Coordinate
 
| Unsigned Byte
 
|
 
|-
 
| Block ID
 
 
  | VarInt
 
  | VarInt
  | The new block ID for the block. <code><nowiki>id &lt;&lt; 4 | data</nowiki></code>
+
  | Length of the following array in bytes (always 2048)
|}
 
 
 
==== Block Change ====
 
Fired whenever a block is changed within the render distance.
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="2"| {{Change|0x23|0x24}}
+
  | Sky Light array
  |rowspan="2"| Play
+
| Array of 2048 bytes
  |rowspan="2"| Client
+
| There is 1 array for each bit set to true in the sky light mask, starting with the lowest value.  Half a byte per light value.
  | Location
+
|- {{added}}
| Position
+
  |colspan="2"| Block Light array count
| Block Coordinates
+
  |colspan="2"| VarInt
 +
  | Number of entries in the following array
 
  |-
 
  |-
  | Block ID
+
  |rowspan="2"| Block Light arrays
 +
| Length
 +
|rowspan="2"| Array
 
  | VarInt
 
  | VarInt
  | The new block ID for the block. <code><nowiki>id &lt;&lt; 4 | data</nowiki></code>
+
  | Length of the following array in bytes (always 2048)
|}
 
 
 
==== Block Action ====
 
 
 
This packet is used for a number of things:
 
 
 
* Chests opening and closing
 
* Pistons pushing and pulling
 
* Note blocks playing
 
* Updating beacons
 
 
 
See Also: [[Block Actions]]
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="4"| {{Change|0x24|0x25}}
 
|rowspan="4"| Play
 
|rowspan="4"| Client
 
| Location
 
| Position
 
| Block Coordinates
 
|-
 
| Byte 1
 
| Unsigned Byte
 
| Varies depending on block — see [[Block Actions]]
 
|-
 
| Byte 2
 
| Unsigned Byte
 
| Varies depending on block — see [[Block Actions]]
 
 
  |-
 
  |-
  | Block Type
+
  | Block Light array
  | VarInt
+
  | Array of 2048 bytes
  | The block type for the block
+
  | There is 1 array for each bit set to true in the block light mask, starting with the lowest value.  Half a byte per light value.
 
  |}
 
  |}
  
==== Block Break Animation ====
 
  
0–9 are the displayable destroy stages and each other number means that there is no animation on this coordinate.
+
==== Map Data ====
  
You can also set an animation to air! The animation will still be visible.
+
Updates a rectangular area on a {{Minecraft Wiki|map}} item.
 
 
If you need to display several break animations at the same time you have to give each of them a unique Entity ID.
 
 
 
Also if you set the coordinates to a special block like water etc. it won't show the actual break animation but some other interesting effects. (Water will lose it's transparency)
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="3"| {{Change|0x25|0x26}}
 
|rowspan="3"| Play
 
|rowspan="3"| Client
 
| Entity ID
 
| VarInt
 
| EID for the animation
 
|-
 
| Location
 
| Position
 
| Block Position
 
|-
 
| Destroy Stage
 
| Byte
 
| 0–9 to set it, any other value to remove it
 
|}
 
 
 
==== {{Change|Map Chunk Bulk|}} ====
 
 
 
Replaced by multiple [[#Chunk Data|Chunk Data]] packets.
 
 
 
==== Maps ====
 
 
 
Updates a rectangular area on a map.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,382: Line 446:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="13"| 0x34
+
  |rowspan="18"| {{change|0x25|0x26}}
  |rowspan="13"| Play
+
  |rowspan="18"| Play
  |rowspan="13"| Client
+
  |rowspan="18"| Client
  |colspan="2"| Item Damage
+
  |colspan="2"| Map ID
 
  |colspan="2"| VarInt
 
  |colspan="2"| VarInt
  | The damage value (map ID) of the map being modified
+
  | Map ID of the map being modified
 
  |-
 
  |-
 
  |colspan="2"| Scale
 
  |colspan="2"| Scale
 
  |colspan="2"| Byte
 
  |colspan="2"| Byte
 
  | From 0 for a fully zoomed-in map (1 block per pixel) to 4 for a fully zoomed-out map (16 blocks per pixel)
 
  | From 0 for a fully zoomed-in map (1 block per pixel) to 4 for a fully zoomed-out map (16 blocks per pixel)
  |- style="background-color: #d9ead3;"
+
  |- {{removed}}
  |colspan="2" | Tracking Position
+
  |colspan="2"| Tracking Position
  |colspan="2" | Boolean
+
  |colspan="2"| Boolean
  | Specifies whether the icons are shown
+
  | Specifies whether player and item frame icons are shown
 +
|-
 +
|colspan="2"| Locked
 +
|colspan="2"| Boolean
 +
| True if the map has been locked in a cartography table
 
  |-  
 
  |-  
 +
|- {{added}}
 +
|colspan="2"| Tracking Position
 +
|colspan="2"| Boolean
 +
| Specifies whether player and item frame icons are shown
 +
|-
 
  |colspan="2"| Icon Count
 
  |colspan="2"| Icon Count
 
  |colspan="2"| VarInt
 
  |colspan="2"| VarInt
  | Number of elements in the following array
+
  | Number of elements in the following array. {{change||Only present if "Tracking Position" is true.}}
 
  |-
 
  |-
  |rowspan="3"| Icon
+
  |rowspan="6"| Icon
  | Direction And Type
+
  | Type
  |rowspan="3"| Array
+
  |rowspan="6"| Array
  | Byte
+
  | VarInt enum
  | 0xF0 = Direction, 0x0F = Type
+
  | See below
 
  |-
 
  |-
 
  | X
 
  | X
 
  | Byte
 
  | Byte
  |  
+
  | Map coordinates: -128 for furthest left, +127 for furthest right
 
  |-
 
  |-
 
  | Z
 
  | Z
 
  | Byte
 
  | Byte
  |  
+
  | Map coordinates: -128 for highest, +127 for lowest
 +
|-
 +
| Direction
 +
| Byte
 +
| 0-15
 +
|-
 +
| Has Display Name
 +
| Boolean
 +
|
 +
|-
 +
| Display Name
 +
| Optional [[Chat]]
 +
| Only present if previous Boolean is true
 
  |-  
 
  |-  
 
  |colspan="2"| Columns
 
  |colspan="2"| Columns
  |colspan="2"| Byte
+
  |colspan="2"| Unsigned Byte
 
  | Number of columns updated
 
  | Number of columns updated
 
  |-
 
  |-
Line 1,440: Line 525:
 
  |}
 
  |}
  
==== Combat Event ====
+
For icons, a direction of 0 is a vertical icon and increments by 22.5&deg; (360/16).
  
{| class="wikitable"
+
Types are based off of rows and columns in <code>map_icons.png</code>:
! Packet ID
 
! State
 
! Bound To
 
!colspan="2"| Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="8"| 0x42
 
|rowspan="8"| Play
 
|rowspan="8"| Client
 
|colspan="2"| Event
 
| VarInt
 
| Determines the layout of the remaining packet
 
|-
 
! Event
 
! Field Name
 
!
 
!
 
|-
 
| 0: enter combat
 
| ''no fields''
 
| ''no fields''
 
|
 
|-
 
|rowspan="2"| 1: end combat
 
| Duration
 
| VarInt
 
|
 
|-
 
| Entity ID
 
| Int
 
|
 
|-
 
|rowspan="3"| 2: entity dead
 
| Player ID
 
| VarInt
 
|
 
|-
 
| Entity ID
 
| Int
 
|
 
|-
 
| Message
 
| {{Change|String|[[Chat]]}}
 
|
 
|}
 
 
 
==== {{Change|Update Entity NBT|}} ====
 
 
 
Was only used to update boss bars, replaced by [[#Boss Bar|Boss Bar]] accordingly.
 
 
 
==== {{Change||Boss Bar}} ====
 
 
 
This packet replaces Update Entity NBT packet which has been removed.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
! Packet ID
 
! State
 
! Bound To
 
!colspan="2"| Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="15"| 0x49
 
|rowspan="15"| Play
 
|rowspan="15"| Client
 
|colspan="2"| UUID
 
| UUID
 
| Unique ID for this bar
 
|-
 
|colspan="2"| Action
 
| VarInt
 
| Determines the layout of the remaining packet
 
|-
 
! Action
 
! Field Name
 
!
 
!
 
|-
 
|rowspan="5"| 0: add
 
| Title
 
| [[Chat]]
 
|
 
|-
 
| Health
 
| Float
 
| From 0 to 1. Values greater than 1 do not crash the client, and start [https://i.johni0702.de/nA.png rendering part of a second health bar] at around 1.5
 
|-
 
| Color
 
| VarInt
 
| Color ID (see below)
 
|-
 
| Dividers
 
| VarInt
 
| Number of dividers rendered in the bar
 
|-
 
| Flags
 
| Unsigned Byte
 
| Bit mask: 0x1 should darken sky, 0x2: is dragon bar
 
|-
 
| 1: remove
 
| ''no fields''
 
| ''no fields''
 
| Removes this boss bar
 
|-
 
| 2: update health
 
| Health
 
| Float
 
| as above
 
|-
 
| 3: update title
 
| Title
 
| [[Chat]]
 
|
 
|-
 
|rowspan="2"| 4: update style
 
| Color
 
| VarInt
 
| Color ID (see below)
 
|-
 
| Dividers
 
| VarInt
 
| as above
 
|-
 
| 5: update flags
 
| Flags
 
| Unsigned Byte
 
| as above
 
 
  |-
 
  |-
|}
+
  ! Icon type
 
+
  ! Result
{| class="wikitable"
 
  ! ID
 
  ! Color
 
 
  |-
 
  |-
 
  | 0
 
  | 0
  | Pink(ish)
+
  | White arrow (players)
 
  |-
 
  |-
 
  | 1
 
  | 1
  | Cyan
+
  | Green arrow (item frames)
 
  |-
 
  |-
 
  | 2
 
  | 2
  | Red
+
  | Red arrow
 
  |-
 
  |-
 
  | 3
 
  | 3
  | Lime
+
  | Blue arrow
 
  |-
 
  |-
 
  | 4
 
  | 4
  | Yellow
+
  | White cross
 
  |-
 
  |-
 
  | 5
 
  | 5
  | Purple
+
  | Red pointer
 
  |-
 
  |-
 
  | 6
 
  | 6
  | White
+
  | White circle (off-map players)
|}
 
 
 
==== {{Change||Set Cooldown}} ====
 
 
 
Applies a cooldown period to an item type.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="2"| 0x4A
+
  | 7
|rowspan="2"| Play
+
  | Small white circle (far-off-map players)
|rowspan="2"| Client
 
| Item ID
 
| VarInt
 
  | ID of the item to apply a cooldown to.
 
 
  |-
 
  |-
  | Cooldown Ticks
+
  | 8
  | VarInt
+
  | Mansion
| Number of ticks to apply a cooldown for.
 
|}
 
 
 
=== Serverbound ===
 
 
 
==== Use Entity ====
 
 
 
This packet is sent from the client to the server when the client attacks or right-clicks another entity (a player, minecart, etc).
 
 
 
A Notchian server only accepts this packet if the entity being attacked/used is visible without obstruction and within a 4-unit radius of the player's position.
 
 
 
Note that middle-click in creative mode is interpreted by the client and sent as a [[#Creative Inventory Action|Creative Inventory Action]] packet instead.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="6"| 0x02
+
  | 9
|rowspan="6"| Play
+
  | Temple
|rowspan="6"| Server
 
| Target
 
| VarInt
 
  |  
 
 
  |-
 
  |-
  | Type
+
  | 10
  | VarInt
+
  | White Banner
| 0: interact, 1: attack, 2: interact at
 
 
  |-
 
  |-
  | Target X
+
  | 11
  | Optional Float
+
  | Orange Banner
| Only if Type is interact at
 
 
  |-
 
  |-
  | Target Y
+
  | 12
  | Optional Float
+
  | Magenta Banner
| Only if Type is interact at
 
 
  |-
 
  |-
  | Target Z
+
  | 13
  | Optional Float
+
  | Light Blue Banner
| Only if Type is interact at
 
|- style="background-color: #d9ead3;"
 
| Hand
 
| Optional VarInt
 
| Only if Type is interact or interact at; 0: main hand, 1: off hand
 
|}
 
 
 
==== Player Digging ====
 
 
 
Sent when the player mines a block. A Notchian server only accepts digging packets with coordinates within a 6-unit radius of the player's position.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="3"| 0x07
+
  | 14
|rowspan="3"| Play
+
  | Yellow Banner
|rowspan="3"| Server
 
| Status
 
| Byte
 
  | The action the player is taking against the block (see below)
 
 
  |-
 
  |-
  | Location
+
  | 15
  | Position
+
  | Lime Banner
| Block position
 
 
  |-
 
  |-
  | Face
+
  | 16
  | Byte
+
  | Pink Banner
| The face being hit (see below)
 
|}
 
 
 
Status can be one of seven values:
 
 
 
{| class="wikitable"
 
! Meaning
 
! Value
 
 
  |-
 
  |-
  | Started digging
+
  | 17
  | <code>0</code>
+
  | Gray Banner
 
  |-
 
  |-
  | Cancelled digging
+
  | 18
  | <code>1</code>
+
  | Light Gray Banner
 
  |-
 
  |-
  | Finished digging
+
  | 19
  | <code>2</code>
+
  | Cyan Banner
 
  |-
 
  |-
  | Drop item stack
+
  | 20
  | <code>3</code>
+
  | Purple Banner
 
  |-
 
  |-
  | Drop item
+
  | 21
  | <code>4</code>
+
  | Blue Banner
 
  |-
 
  |-
  | Shoot arrow / finish eating
+
  | 22
  | <code>5</code>
+
  | Brown Banner
|- style="background-color: #d9ead3;"
 
| Swap item in Hand
 
| <code>6</code>
 
|}
 
 
 
Notchian clients send a 0 (started digging) when they start digging and a 2 (finished digging) once they think they are finished. If digging is aborted, the client simply sends a 1 (cancel digging).
 
 
 
Status code 4 (drop item) is a special case. In-game, when you use the Drop Item command (keypress 'q'), a dig packet with a status of 4, Location set to 0/0/0, and Face set to 0, is sent from client to server. Status code 3 is similar, but drops the entire stack.
 
 
 
Status code 5 (shoot arrow / finish eating) is also a special case. Location is set to 0/0/0 like above, but the face field is set to 255.
 
 
 
Status code 6 is another special case. Used to swap or assign an item to the second hand. Location is set to 0/0/0 and Face is set to 0.
 
 
 
The Face field can be one of six values, representing the face being hit:
 
 
 
{| class="wikitable"
 
 
  |-
 
  |-
! Value
+
  | 23
| 0
+
  | Green Banner
| 1
 
| 2
 
| 3
 
  | 4
 
  | 5
 
 
  |-
 
  |-
! Offset
+
  | 24
| -Y
+
  | Red Banner
  | +Y
 
  | -Z
 
| +Z
 
| -X
 
| +X
 
|}
 
 
 
==== {{Change||Use Item}} ====
 
 
 
Sent when pressing the Use Item key (default: right click) with an item in hand.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="1"| 0x08
+
  | 25
|rowspan="1"| Play
+
  | Black Banner
|rowspan="1"| Server
 
  | Hand
 
| VarInt
 
| Hand used for the animation
 
|}
 
 
 
==== Player Block Placement ====
 
 
 
{| class="wikitable"
 
 
  |-
 
  |-
! Packet ID
+
  | 26
! State
+
  | Treasure marker
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="7"| {{Change|0x08|0x09}}
 
|rowspan="7"| Play
 
|rowspan="7"| Server
 
| Location
 
| Position
 
| Block position
 
|-
 
| Face
 
| {{Change|Byte|VarInt}}
 
| The face on which the block is placed (see above)
 
|- style="background-color: #f4cccc; text-decoration: line-through;"
 
| Held Item
 
| [[Slot Data|Slot]]
 
|
 
|- style="background-color: #d9ead3;"
 
| Hand
 
| VarInt
 
| The hand from which the block is placed; 0: main hand, 1: off hand
 
|-
 
| Cursor Position X
 
| Byte
 
| The position of the crosshair on the block
 
|-
 
| Cursor Position Y
 
| Byte
 
|
 
|-
 
| Cursor Position Z
 
  | Byte
 
  |  
 
 
  |}
 
  |}
  
In normal operation (i.e. placing a block), this packet is sent once, with the values set normally.
+
==== Player Position And Look (clientbound) ====
  
This packet has a special case where X, Y, Z, and Direction are all -1. (Note that Y is unsigned so set to 255.) This special packet indicates that the currently held item for the player should have its state updated such as eating food, pulling back bows, using buckets, etc.
+
Updates the player's position on the server. This packet will also close the “Downloading Terrain” screen when joining/respawning.
  
Special note on using buckets: When using buckets, the Notchian client might send two packets: first a normal and then a special case. The first normal packet is sent when you're looking at a block (e.g. the water you want to scoop up). This normal packet does not appear to do anything with a Notchian server. The second, special case packet appears to perform the action — based on current position/orientation and with a distance check — it appears that buckets can only be used within a radius of 6 units.
+
If the distance between the last known position of the player on the server and the new position set by this packet is greater than 100 meters, the client will be kicked for “You moved too quickly :( (Hacking?)”.
  
==== Held Item Change ====
+
Also if the fixed-point number of X or Z is set greater than <code>3.2E7D</code> the client will be kicked for “Illegal position”.
  
Sent when the player changes the slot selection.
+
Yaw is measured in degrees, and does not follow classical trigonometry rules. The unit circle of yaw on the XZ-plane starts at (0, 1) and turns counterclockwise, with 90 at (-1, 0), 180 at (0, -1) and 270 at (1, 0). Additionally, yaw is not clamped to between 0 and 360 degrees; any number is valid, including negative numbers and numbers greater than 360.
  
{| class="wikitable"
+
Pitch is measured in degrees, where 0 is looking straight ahead, -90 is looking straight up, and 90 is looking straight down.
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="1"| {{Change|0x09|0x0A}}
 
|rowspan="1"| Play
 
|rowspan="1"| Server
 
| Slot
 
| Short
 
| The slot which the player has selected (0–8)
 
|}
 
 
 
==== Animation ====
 
 
 
Sent when the player's arm swings
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,856: Line 636:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| {{Change|0x0A|0x0B}}
+
  |rowspan="8"| {{change|0x34|0x35}}
  |rowspan="1"| Play
+
  |rowspan="8"| Play
  |rowspan="1"| Server
+
  |rowspan="8"| Client
  |style="background-color: #d9ead3;"| Hand
+
  | X
  |style="background-color: #d9ead3;"| VarInt
+
  | Double
  |style="background-color: #d9ead3;"| Hand used for the animation
+
  | Absolute or relative position, depending on Flags.
|}
 
 
 
==== Entity Action ====
 
 
 
Sent at least when crouching, leaving a bed, or sprinting. To send action animation to client use 0x28. The client will send this with Action ID = 3 when “Leave Bed” is clicked.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="3"| {{Change|0x0B|0x0C}}
+
  | Y
|rowspan="3"| Play
+
  | Double
|rowspan="3"| Server
+
  | Absolute or relative position, depending on Flags.
| Entity ID
 
  | VarInt
 
  | Player ID
 
 
  |-
 
  |-
  | Action ID
+
  | Z
  | VarInt
+
  | Double
  | The ID of the action, see below
+
  | Absolute or relative position, depending on Flags.
 
  |-
 
  |-
  | Jump Boost
+
  | Yaw
| VarInt
 
| Horse jump boost. Ranged from 0 -> 100.
 
|}
 
 
 
Action ID can be one of the following values:
 
 
 
{| class="wikitable"
 
! ID
 
! Action
 
|-
 
| 0
 
| Crouch
 
|-
 
| 1
 
| Uncrouch
 
|-
 
| 2
 
| Leave bed
 
|-
 
| 3
 
| Start sprinting
 
|-
 
| 4
 
| Stop sprinting
 
|-
 
| 5
 
| Jump with horse
 
|- style="background-color: #f4cccc; text-decoration: line-through;"
 
| 6
 
| Open inventory
 
|}
 
 
 
“Open inventory” is now sent via the [[#Client Status|Client Status]] packet.
 
 
 
==== Steer Vehicle ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="3"| {{Change|0x0C|0x0D}}
 
|rowspan="3"| Play
 
|rowspan="3"| Server
 
| Sideways
 
 
  | Float
 
  | Float
  | Positive to the left of the player
+
  | Absolute or relative rotation on the X axis, in degrees.
 
  |-
 
  |-
  | Forward
+
  | Pitch
 
  | Float
 
  | Float
  | Positive forward
+
  | Absolute or relative rotation on the Y axis, in degrees.
 
  |-
 
  |-
 
  | Flags
 
  | Flags
| Unsigned Byte
 
| Bit mask. 0x1: jump, 0x2: unmount
 
|}
 
 
==== Close Window ====
 
 
This packet is sent by the client when closing a window.
 
 
Note, Notchian clients send a close window message with Window ID 0 to close their inventory even though there is never an Open Window message for the inventory.
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
| {{Change|0x0D|0x0E}}
 
|rowspan="1"| Play
 
|rowspan="1"| Server
 
| Window ID
 
| Unsigned Byte
 
| This is the ID of the window that was closed. 0 for inventory.
 
|}
 
 
==== Click Window ====
 
 
This packet is sent by the player when it clicks on a slot in a window.
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="6"| {{Change|0x0E|0x0F}}
 
|rowspan="6"| Play
 
|rowspan="6"| Server
 
| Window ID
 
| Unsigned Byte
 
| The ID of the window which was clicked. 0 for player inventory.
 
|-
 
| Slot
 
| Short
 
| The clicked slot number, see below
 
|-
 
| Button
 
 
  | Byte
 
  | Byte
  | The button used in the click, see below
+
  | Bit field, see below.
 
  |-
 
  |-
  | Action Number
+
  | Teleport ID
  | Short
+
  | VarInt
  | A unique number for the action, implemented by Notchian as a counter, starting at 1. Used by the server to send back a [[Protocol#Confirm Transaction|Confirm Transaction]].
+
  | Client should confirm this packet with [[#Teleport Confirm|Teleport Confirm]] containing the same Teleport ID.
  |-
+
  |- {{added}}
  | Mode
+
  | Dismount Vehicle
  | Byte
+
  | Boolean
  | Inventory operation mode, see below
+
  | True if the player should dismount their vehicle.
|-
 
| Clicked item
 
| [[Slot Data|Slot]]
 
| The clicked slot. Has to be empty (item ID = -1) for drop mode.
 
 
  |}
 
  |}
  
See [[Inventory#Windows]] for further information about how slots are indexed.
+
About the Flags field:
 
 
When right-clicking on a stack of items, half the stack will be picked up and half left in the slot. If the stack is an odd number, the half left in the slot will be smaller of the amounts.
 
  
The distinct type of click performed by the client is determined by the combination of the Mode and Button fields.
+
<Dinnerbone> It's a bitfield, X/Y/Z/Y_ROT/X_ROT. If X is set, the x value is relative and not absolute.
  
 
{| class="wikitable"
 
{| class="wikitable"
! Mode
 
! Button
 
! Slot
 
! Trigger
 
 
  |-
 
  |-
  !rowspan="2"| 0
+
  ! Field
  | 0
+
  ! Bit
| Normal
 
| Left mouse click
 
 
  |-
 
  |-
  | 1
+
  | X
  | Normal
+
  | 0x01
| Right mouse click
 
 
  |-
 
  |-
  !rowspan="2"| 1
+
  | Y
  | 0
+
  | 0x02
| Normal
 
| Shift + left mouse click
 
 
  |-
 
  |-
  | 1
+
  | Z
  | Normal
+
  | 0x04
| Shift + right mouse click ''(identical behavior)''
 
 
  |-
 
  |-
  !rowspan="5"| 2
+
  | Y_ROT
  | 0
+
  | 0x08
| Normal
 
| Number key 1
 
 
  |-
 
  |-
  | 1
+
  | X_ROT
  | Normal
+
  | 0x10
| Number key 2
 
|-
 
| 2
 
| Normal
 
| Number key 3
 
|-
 
| ⋮
 
| ⋮
 
| ⋮
 
|-
 
| 8
 
| Normal
 
| Number key 9
 
|-
 
!rowspan="1"| 3
 
| 2
 
| Normal
 
| Middle click
 
|-
 
!rowspan="4"| 4
 
| 0
 
| Normal*
 
| Drop key (Q) (* Clicked item is different, see above)
 
|-
 
| 1
 
| Normal*
 
| Ctrl + Drop key (Ctrl-Q) ''(drops full stack)''
 
|-
 
| 0
 
| -999
 
| Left click outside inventory holding nothing ''(no-op)''
 
|-
 
| 1
 
| -999
 
| Right click outside inventory holding nothing ''(no-op)''
 
|-
 
!rowspan="6"| 5
 
| 0
 
| -999
 
| Starting left mouse drag ''(or middle mouse)''
 
|-
 
| 4
 
| -999
 
| Starting right mouse drag
 
|-
 
| 1
 
| Normal
 
| Add slot for left-mouse drag
 
|-
 
| 5
 
| Normal
 
| Add slot for right-mouse drag
 
|-
 
| 2
 
| -999
 
| Ending left mouse drag
 
|-
 
| 6
 
| -999
 
| Ending right mouse drag
 
|-
 
! 6
 
| 0
 
| Normal
 
| Double click
 
 
  |}
 
  |}
  
Starting from version 1.5, “painting mode” is available for use in inventory windows. It is done by picking up stack of something (more than 1 item), then holding mouse button (left, right or middle) and dragging held stack over empty (or same type in case of right button) slots. In that case client sends the following to server after mouse button release (omitting first pickup packet which is sent as usual):
+
==== Resource Pack Send ====  
 
 
# packet with mode 5, slot -999, button (0 for left | 4 for right);
 
# packet for every slot painted on, mode is still 5, button (1 | 5);
 
# packet with mode 5, slot -999, button (2 | 6);
 
 
 
If any of the painting packets other than the “progress” ones are sent out of order (for example, a start, some slots, then another start; or a left-click in the middle) the painting status will be reset.
 
 
 
The server will send back a [[#Confirm Transaction|Confirm Transaction]]<!-- note that the anchor should be changed to #Confirm Transaction 2 when merging with [[Protocol]] --> packet. If the click was not accepted, the client must reflect that packet before sending more [[#Click Window|Click Window]] packets, otherwise the server will reject them silently. The Notchian server also sends a [[Protocol#Window Items|Window Items]] packet for the open window and [[Protocol#Set Slot|Set Slot]] packets for the clicked and cursor slot, but only when the click was not accepted, probably to resynchronize client and server.
 
 
 
==== Confirm Transaction ====
 
 
 
<SpaceManiac> noooo idea why the serverbound confirm transaction packet exists
 
<SpaceManiac> I think it's sent as a response to the clientbound confirm transaction in some situations, but it's fuzzy
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 2,137: Line 707:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| {{Change|0x0F|0x10}}
+
  |rowspan="3"| {{change|0x38|0x39}}
 
  |rowspan="3"| Play
 
  |rowspan="3"| Play
  |rowspan="3"| Server
+
  |rowspan="3"| Client
  | Window ID
+
  | URL
  | Byte
+
  | String (32767)
  | The ID of the window that the action occurred in
+
  | The URL to the resource pack.
 
  |-
 
  |-
  | Action Number
+
  | Hash
  | Short
+
  | String (40)
  | Every action that is to be accepted has a unique number. This field corresponds to that number.
+
  | A 40 character hexadecimal and lowercase [[wikipedia:SHA-1|SHA-1]] hash of the resource pack file. (must be lower case in order to work)<br />If it's not a 40 character hexadecimal string, the client will not use it for hash verification and likely waste bandwidth — but it will still treat it as a unique id
  |-
+
  |- {{Added}}
  | Accepted
+
  | Forced
 
  | Boolean
 
  | Boolean
  | Whether the action was accepted
+
  | The notchian client will be forced to use the resource pack from the server. If they decline they will be kicked from the server.
 
  |}
 
  |}
  
==== Creative Inventory Action ====
+
==== Tags ====
 
 
While the user is in the standard inventory (i.e., not a crafting bench) in Creative mode, the player will send this packet.
 
 
 
Clicking in the creative inventory menu is quite different from non-creative inventory management. Picking up an item with the mouse actually deletes the item from the server, and placing an item into a slot or dropping it out of the inventory actually tells the server to create the item from scratch. (This can be verified by clicking an item that you don't mind deleting, then severing the connection to the server; the item will be nowhere to be found when you log back in.) As a result of this implementation strategy, the "Destroy Item" slot is just a client-side implementation detail that means "I don't intend to recreate this item.". Additionally, the long listings of items (by category, etc.) are a client-side interface for choosing which item to create. Picking up an item from such listings sends no packets to the server; only when you put it somewhere does it tell the server to create the item in that location.
 
 
 
This action can be described as “set inventory slot”. Picking up an item sets the slot to item ID -1. Placing an item into an inventory slot sets the slot to the specified item. Dropping an item (by clicking outside the window) effectively sets slot -1 to the specified item, which causes the server to spawn the item entity, etc.. All other inventory slots are numbered the same as the non-creative inventory (including slots for the 2×2 crafting menu, even though they aren't visible in the vanilla client).
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 2,165: Line 729:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
  ! Field Type
+
  !colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| {{Change|0x10|0x11}}
+
  |rowspan="8"| {{change|0x5B|0x5C}}
  |rowspan="2"| Play
+
  |rowspan="8"| Play
  |rowspan="2"| Server
+
  |rowspan="8"| Client
  | Slot
+
|- {{removed}}
  | Short
+
| colspan="2"| Block Tags
  | Inventory slot
+
| colspan="2"| (See below)
  |-
+
| IDs are block IDs
  | Clicked Item
+
|- {{removed}}
  | [[Slot Data|Slot]]
+
  | colspan="2"| Item Tags
 +
  | colspan="2"| (See below)
 +
  | IDs are item IDs
 +
  |- {{removed}}
 +
  | colspan="2"| Fluid Tags
 +
| colspan="2"| (See below)
 +
| IDs are fluid IDs
 +
|- {{removed}}
 +
| colspan="2"| Entity Tags
 +
| colspan="2"| (See below)
 +
| IDs are entity IDs
 +
|- {{added}}
 +
| colspan="2"| Length of the array
 +
  | colspan="2"| VarInt
 
  |  
 
  |  
  |}
+
  |- {{added}}
 
+
|rowspan="2"| Array of tags
==== Enchant Item ====
+
  | Tag type
 
+
  |rowspan="2"| Array
{| class="wikitable"
+
  | Identifier
  ! Packet ID
+
  | Tag identifier (Vanilla required tags are <code>minecraft:block</code>, <code>minecraft:item</code>, <code>minecraft:fluid</code>, <code>minecraft:entity_type</code>, and <code>minecraft:game_event</code>)
  ! State
 
  ! Bound To
 
  ! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="2"| {{Change|0x11|0x12}}
+
  | Array of Tag
|rowspan="2"| Play
+
  | (See below)
|rowspan="2"| Server
+
  |
| Window ID
 
| Byte
 
| The ID of the enchantment table window sent by [[Protocol#Open Window|Open Window]]
 
|-
 
  | Enchantment
 
  | Byte
 
| The position of the enchantment on the enchantment table window, starting with 0 as the topmost one
 
 
  |}
 
  |}
  
==== Update Sign ====
+
Tags look like:
 
 
This message is sent from the client to the server when the “Done” button is pushed after placing a sign.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  !colspan="2"| Field Name
! State
+
  !colspan="2"| Field Type
! Bound To
 
! Field Name
 
  ! Field Type
 
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="5"| {{Change|0x12|0x13}}
+
  |colspan="2"| Length
  |rowspan="5"| Play
+
  |colspan="2"| VarInt
|rowspan="5"| Server
+
  | Number of elements in the following array
| Location
 
| Position
 
  | Block Coordinates
 
 
  |-
 
  |-
  | Line 1
+
  |rowspan="3"| Tags
  | {{Change|[[Chat]]|String}}
+
| Tag name
  | First line of text in the sign
+
  |rowspan="3"| Array
 +
| Identifier
 +
  |
 
  |-
 
  |-
  | Line 2
+
  | Count
  | {{Change|[[Chat]]|String}}
+
  | VarInt
| Second line of text in the sign
+
  | Number of elements in the following array
|-
 
| Line 3
 
| {{Change|[[Chat]]|String}}
 
  | Third line of text in the sign
 
 
  |-
 
  |-
  | Line 4
+
  | Entries
  | {{Change|[[Chat]]|String}}
+
  | Array of VarInt
  | Fourth line of text in the sign
+
  | Numeric ID of the given type (block, item, etc.).
 
  |}
 
  |}
  
==== Player Abilities ====
 
  
The latter 2 bytes are used to indicate the walking and flying speeds respectively, while the first byte is used to determine the value of 4 booleans.
+
=== Serverbound ===
 
 
The vanilla client sends this packet when the player starts/stops flying with the second parameter changed accordingly. All other parameters are ignored by the vanilla server.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="3"| {{Change|0x13|0x14}}
 
|rowspan="3"| Play
 
|rowspan="3"| Server
 
| Flags
 
| Byte
 
| Bit mask. 0x08: damage disabled (god mode), 0x04: can fly, 0x02: is flying, 0x01: is Creative
 
|-
 
| Flying Speed
 
| Float
 
|
 
|-
 
| Walking Speed
 
| Float
 
|
 
|}
 
 
 
==== Tab-Complete ====
 
 
 
Sent when the user presses ''tab'' while writing text.
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="3"| {{Change|0x14|0x15}}
 
|rowspan="3"| Play
 
|rowspan="3"| Server
 
| Text
 
| String
 
| All text behind the cursor
 
|-
 
| Has Position
 
| Boolean
 
|
 
|-
 
| Looked At Block
 
| Optional Position
 
| The position of the block being looked at. Only sent if Has Position is true
 
|}
 
  
 
==== Client Settings ====
 
==== Client Settings ====
Line 2,309: Line 809:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="6"| {{Change|0x15|0x16}}
+
  |rowspan="7"| 0x05
  |rowspan="6"| Play
+
  |rowspan="7"| Play
  |rowspan="6"| Server
+
  |rowspan="7"| Server
 
  | Locale
 
  | Locale
  | String
+
  | String (16)
  | e.g. en_GB
+
  | e.g. <code>en_GB</code>.
 
  |-
 
  |-
 
  | View Distance
 
  | View Distance
 
  | Byte
 
  | Byte
  | Client-side render distance, in chunks
+
  | Client-side render distance, in chunks.
 
  |-
 
  |-
 
  | Chat Mode
 
  | Chat Mode
  | {{Change|Byte|VarInt}}
+
  | VarInt Enum
  | 0: enabled, 1: commands only, 2: hidden
+
  | 0: enabled, 1: commands only, 2: hidden.  See [[Chat#Processing chat|processing chat]] for more information.
 
  |-
 
  |-
 
  | Chat Colors
 
  | Chat Colors
 
  | Boolean
 
  | Boolean
  | “Colors” multiplayer setting
+
  | “Colors” multiplayer setting.
 
  |-
 
  |-
 
  | Displayed Skin Parts
 
  | Displayed Skin Parts
 
  | Unsigned Byte
 
  | Unsigned Byte
  | Skin parts, see note below
+
  | Bit mask, see below.
  |- style="background-color: #d9ead3;"
+
  |-
 
  | Main Hand
 
  | Main Hand
  | VarInt
+
  | VarInt Enum
  | 0: Left, 1: Right
+
  | 0: Left, 1: Right.
 +
|- {{Added}}
 +
| Disable text filtering
 +
| Boolean
 +
| Disables filtering of text on signs and written book titles.  Currently always true (i.e. the filtering is disabled)
 
  |}
 
  |}
  
Line 2,349: Line 853:
 
The most significant bit (bit 7, 0x80) appears to be unused.
 
The most significant bit (bit 7, 0x80) appears to be unused.
  
==== Client Status ====
+
== Handshaking ==
  
Sent when the client is ready to complete login and when the client is ready to respawn after death.
+
=== Clientbound ===
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="1"| {{Change|0x16|0x17}}
 
|rowspan="1"| Play
 
|rowspan="1"| Server
 
| Action ID
 
| VarInt
 
| See below
 
|}
 
  
''Action ID'' values:
+
There are no clientbound packets in the Handshaking state, since the protocol immediately switches to a different state after the client sends the first packet.
  
{| class="wikitable"
+
=== Serverbound ===
|-
 
! Action ID
 
! Action
 
|-
 
| 0
 
| Perform respawn
 
|-
 
| 1
 
| Request stats
 
|-
 
| 2
 
| {{Change|''Taking Inventory'' achievement|Open Inventory}}
 
|}
 
  
==== Plugin Message ====
+
==== Handshake ====
  
Mods and plugins can use this to send their data. Minecraft itself uses a number of [[plugin channel]]s. These internal channels are prefixed with <code>MC|</code>.
+
This causes the server to switch into the target state.
 
 
More documentation on this: [http://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/ http://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/]
 
 
 
Note that the data length is known from the packet length, so there is no need for a length member being sent.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 2,402: Line 873:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| {{Change|0x17|0x18}}
+
  |rowspan="4"| 0x00
  |rowspan="2"| Play
+
  |rowspan="4"| Handshaking
  |rowspan="2"| Server
+
  |rowspan="4"| Server
  | Channel
+
  | Protocol Version
  | String
+
  | VarInt
  | Name of the [[plugin channel]] used to send the data
+
  | See [[protocol version numbers]] (currently {{change|754|{{Snapshot PVN|1073741839}}}})
 
  |-
 
  |-
  | Data
+
  | Server Address
| Byte Array
 
| Any data, depending on the channel. <code><nowiki>MC|</nowiki></code> channels are documented [[plugin channel|here]].
 
|}
 
 
 
==== Spectate ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="1"| {{Change|0x18|0x19}}
 
|rowspan="1"| Play
 
|rowspan="1"| Server
 
| Target Player
 
| UUID
 
|
 
|}
 
 
 
==== Resource Pack Status ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="2"| {{Change|0x19|0x1A}}
 
|rowspan="2"| Play
 
|rowspan="2"| Server
 
| Hash
 
 
  | String
 
  | String
  | The hash sent in the [[Protocol#Resource Pack Send|Resource Pack Send]] packet.
+
  | Hostname or IP, e.g. localhost or 127.0.0.1, that was used to connect. The Notchian server does not use this information. Note that SRV records are a complete redirect, e.g. if _minecraft._tcp.example.com points to mc.example.org, users connecting to example.com will provide mc.example.org as server address in addition to connecting to it.
 +
|-
 +
| Server Port
 +
| Unsigned Short
 +
| Default is 25565.  The Notchian server does not use this information.
 
  |-
 
  |-
  | Result
+
  | Next State
  | VarInt
+
  | VarInt Enum
  | 0: successfully loaded, 1: declined, 2: failed download, 3: accepted
+
  | 1 for [[#Status|status]], 2 for [[#Login|login]]
 
  |}
 
  |}
  
Line 2,473: Line 912:
  
 
No changes so far.
 
No changes so far.
 +
 +
 +
[[Category:Minecraft Modern]]

Latest revision as of 00:28, 2 April 2021

This page documents the changes from the last stable Minecraft release (currently 1.16.5, protocol 754) to the current pre-release (currently 21w07a, protocol Snapshot 15). Note that this page contains bleeding-edge information that may not be completely or correctly documented.

One who wishes to commandeer the merging of this into Protocol when an update is made must be sure to respect any changes that may have occurred to the respective packets there.

Contents

Data types

No changes so far.

Packets

ID Packet name Documentation
Play clientbound
0x05 Sculk Vibration Signal Pre
0x05 0x06 Entity Animation (clientbound) Current (unchanged)
0x06 0x07 Statistics Current (unchanged)
0x07 0x08 Acknowledge Player Digging Current (unchanged)
0x08 0x09 Block Break Animation Current (unchanged)
0x09 0x0A Block Entity Data Current (unchanged)
0x0A 0x0B Block Action Current (unchanged)
0x0B 0x0C Block Change Current (unchanged)
0x0C 0x0D Boss Bar Current (unchanged)
0x0D 0x0E Server Difficulty Current (unchanged)
0x0E 0x0F Chat Message (clientbound) Current (unchanged)
0x0F 0x10 Tab-Complete (clientbound) Current (unchanged)
0x10 0x11 Declare Commands Current (unchanged)
0x11 0x12 Window Confirmation (clientbound) Current (unchanged)
0x12 0x13 Close Window (clientbound) Current (unchanged)
0x13 0x14 Window Items Current (unchanged)
0x14 0x15 Window Property Current (unchanged)
0x15 0x16 Set Slot Current (unchanged)
0x16 0x17 Set Cooldown Current (unchanged)
0x17 0x18 Plugin Message (clientbound) Current (unchanged)
0x18 0x19 Named Sound Effect Current (unchanged)
0x19 0x1A Disconnect (play) Current (unchanged)
0x1A 0x1B Entity Status Current (unchanged)
0x1B 0x1C Explosion Current (unchanged)
0x1C 0x1D Unload Chunk Current (unchanged)
0x1D 0x1E Change Game State Current (unchanged)
0x1E 0x1F Open Horse Window Current (unchanged)
0x1F 0x20 Keep Alive (clientbound) Current (unchanged)
0x20 0x21 Chunk Data Current Pre
0x21 0x22 Effect Current (unchanged)
0x22 0x23 Particle Current (unchanged)
0x23 0x24 Update Light Current Pre
0x24 0x25 Join Game Current (unchanged)
0x25 0x26 Map Data Current Pre
0x26 0x27 Trade List Current (unchanged)
0x27 0x28 Entity Position Current (unchanged)
0x28 0x29 Entity Position and Rotation Current (unchanged)
0x29 0x2A Entity Rotation Current (unchanged)
0x2A 0x2B Entity Movement Current (unchanged)
0x2B 0x2C Vehicle Move (clientbound) Current (unchanged)
0x2C 0x2D Open Book Current (unchanged)
0x2D 0x2E Open Window Current (unchanged)
0x2E 0x2F Open Sign Editor Current (unchanged)
0x2F 0x30 Craft Recipe Response Current (unchanged)
0x30 0x31 Player Abilities (clientbound) Current (unchanged)
0x31 0x32 Combat Event Current (unchanged)
0x32 0x33 Player Info Current (unchanged)
0x33 0x34 Face Player Current (unchanged)
0x34 0x35 Player Position And Look (clientbound) Current Pre
0x35 0x36 Unlock Recipes Current (unchanged)
0x36 0x37 Destroy Entities Current (unchanged)
0x37 0x38 Remove Entity Effect Current (unchanged)
0x38 0x39 Resource Pack Send Current Pre
0x39 0x3A Respawn Current (unchanged)
0x3A 0x3B Entity Head Look Current (unchanged)
0x3B 0x3C Multi Block Change Current (unchanged)
0x3C 0x3D Select Advancement Tab Current (unchanged)
0x3D 0x3E World Border Current (unchanged)
0x3E 0x3F Camera Current (unchanged)
0x3F 0x40 Held Item Change (clientbound) Current (unchanged)
0x40 0x41 Update View Position Current (unchanged)
0x41 0x42 Update View Distance Current (unchanged)
0x42 0x43 Spawn Position Current (unchanged)
0x43 0x44 Display Scoreboard Current (unchanged)
0x44 0x45 Entity Metadata Current (unchanged)
0x45 0x46 Attach Entity Current (unchanged)
0x46 0x47 Entity Velocity Current (unchanged)
0x47 0x48 Entity Equipment Current (unchanged)
0x48 0x49 Set Experience Current (unchanged)
0x49 0x4A Update Health Current (unchanged)
0x4A 0x4B Scoreboard Objective Current (unchanged)
0x4B 0x4C Set Passengers Current (unchanged)
0x4C 0x4D Teams Current (unchanged)
0x4D 0x4E Update Score Current (unchanged)
0x4E 0x4F Time Update Current (unchanged)
0x4F 0x50 Title Current (unchanged)
0x50 0x51 Entity Sound Effect Current (unchanged)
0x51 0x52 Sound Effect Current (unchanged)
0x52 0x53 Stop Sound Current (unchanged)
0x53 0x54 Player List Header And Footer Current (unchanged)
0x54 0x55 NBT Query Response Current (unchanged)
0x55 0x56 Collect Item Current (unchanged)
0x56 0x57 Entity Teleport Current (unchanged)
0x57 0x58 Advancements Current (unchanged)
0x58 0x59 Entity Properties Current (unchanged)
0x59 0x5A Entity Effect Current (unchanged)
0x5A 0x5B Declare Recipes Current (unchanged)
0x5B 0x5C Tags Current Pre
Play serverbound
0x05 Client Settings Current Pre
Handshaking serverbound
0x00 Handshake Current Pre

New/modified data types

No changes so far.

Entity Metadata

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

Entity

The base class.

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

Block Actions

No changes so far.

Inventories

No changes so far.

Plugin Channels

No changes so far.

Play

Clientbound

Sculk Vibration Signal

Packet ID State Bound To Field Name Field Type Notes
0x05 Play Client Source Position Position Source position for the vibration.
Destination Identifier Identifier Identifier of the destination codec type.
Destination Varies Vanilla default destinations are a block position encoded as a Position for "block" or an entity id encoded as a VarInt for "entity".
Arrival Ticks VarInt Ticks for the signal to arrive at the destination.

This packet shows a permanent particle.

Chunk Data

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

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

Packet ID State Bound To Field Name Field Type Notes
0x20 0x21 Play Client Chunk X Int Chunk coordinate (block coordinate divided by 16, rounded down)
Chunk Z Int Chunk coordinate (block coordinate divided by 16, rounded down)
Full chunk Boolean See Chunk Format
Primary Bit Mask VarInt Bitmask with bits set to 1 for every 16×16×16 chunk section whose data is included in Data. The least significant bit represents the chunk section at the bottom of the chunk column (from y=0 to y=15).
Bit Mask Length VarInt Length of the following array
Primary Bit Mask Array of Long BitSet with bits (world height in blocks / 16) set to 1 for every 16×16×16 chunk section whose data is included in Data. The least significant bit represents the chunk section at the bottom of the chunk column (from the lowest y to 15 blocks above).
Heightmaps NBT Compound containing one long array named MOTION_BLOCKING, which is a heightmap for the highest solid block at each position in the chunk (as a compacted long array with 256 entries at 9 bits per entry totaling 36 longs). The Notchian server also adds a WORLD_SURFACE long array, the purpose of which is unknown, but it's not required for the chunk to be accepted.
Biomes length Optional VarInt Size of the following array; should always be 1024. Not present if full chunk is false.
Biomes Optional Array of VarInt 1024 biome IDs, ordered by x then z then y, in 4×4×4 blocks. Not present if full chunk is false. See Chunk Format § Biomes.
Size VarInt Size of Data in bytes
Data Byte array See data structure in Chunk Format
Number of block entities VarInt Number of elements in the following array
Block entities Array of NBT Tag All block entities in the chunk. Use the x, y, and z tags in the NBT to determine their positions.

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

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

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

0020863148418841 0000000000100000100001100011000101001000010000011000100001000001
01018A7260F68C87 0000000100000001100010100111001001100000111101101000110010000111

Update Light

Updates light levels for a chunk.

Packet ID State Bound To Field Name Field Type Notes
0x23 0x24 Play Client Chunk X VarInt Chunk coordinate (block coordinate divided by 16, rounded down)
Chunk Z VarInt Chunk coordinate (block coordinate divided by 16, rounded down)
Trust Edges Boolean If edges should be trusted for light updates.
Sky Light Mask VarInt Mask containing 18 bits, with the lowest bit corresponding to chunk section -1 (in the void, y=-16 to y=-1) and the highest bit for chunk section 16 (above the world, y=256 to y=271)
Block Light Mask VarInt Mask containing 18 bits, with the same order as sky light
Empty Sky Light Mask VarInt Mask containing 18 bits, which indicates sections that have 0 for all their sky light values. If a section is set in both this mask and the main sky light mask, it is ignored for this mask and it is included in the sky light arrays (the notchian server does not create such masks). If it is only set in this mask, it is not included in the sky light arrays.
Empty Block Light Mask VarInt Mask containing 18 bits, which indicates sections that have 0 for all their block light values. If a section is set in both this mask and the main block light mask, it is ignored for this mask and it is included in the block light arrays (the notchian server does not create such masks). If it is only set in this mask, it is not included in the block light arrays.
Length 1 VarInt Length of the following array
Sky Light Mask Array of Long BitSet containing bits for each sections in the world + 2 (lowest bit 16-1 blocks below min world height, highest 1-16 above max world height)
Length 2 VarInt Length of the following array
Block Light Mask Array of Long BitSet containing bits for each sections in the world + 2, same order as sky light
Length 3 VarInt Length of the following array
Empty Sky Light Mask Array of Long BitSet containing a variable amount of bits (see sky/block light) which indicates sections that have 0 for all their sky light values
Length 4 VarInt Length of the following array
Empty Block Light Mask Array of Long BitSet containing a variable amount of bits (see sky/block light) which indicates sections that have 0 for all their block light values
Sky Light array count VarInt Number of entries in the following array
Sky Light arrays Length Array VarInt Length of the following array in bytes (always 2048)
Sky Light array Array of 2048 bytes There is 1 array for each bit set to true in the sky light mask, starting with the lowest value. Half a byte per light value.
Block Light array count VarInt Number of entries in the following array
Block Light arrays Length Array VarInt Length of the following array in bytes (always 2048)
Block Light array Array of 2048 bytes There is 1 array for each bit set to true in the block light mask, starting with the lowest value. Half a byte per light value.


Map Data

Updates a rectangular area on a map item.

Packet ID State Bound To Field Name Field Type Notes
0x25 0x26 Play Client Map ID VarInt Map ID of the map being modified
Scale Byte From 0 for a fully zoomed-in map (1 block per pixel) to 4 for a fully zoomed-out map (16 blocks per pixel)
Tracking Position Boolean Specifies whether player and item frame icons are shown
Locked Boolean True if the map has been locked in a cartography table
Tracking Position Boolean Specifies whether player and item frame icons are shown
Icon Count VarInt Number of elements in the following array. Only present if "Tracking Position" is true.
Icon Type Array VarInt enum See below
X Byte Map coordinates: -128 for furthest left, +127 for furthest right
Z Byte Map coordinates: -128 for highest, +127 for lowest
Direction Byte 0-15
Has Display Name Boolean
Display Name Optional Chat Only present if previous Boolean is true
Columns Unsigned Byte Number of columns updated
Rows Optional Byte Only if Columns is more than 0; number of rows updated
X Optional Byte Only if Columns is more than 0; x offset of the westernmost column
Z Optional Byte Only if Columns is more than 0; z offset of the northernmost row
Length Optional VarInt Only if Columns is more than 0; length of the following array
Data Optional Array of Unsigned Byte Only if Columns is more than 0; see Map item format

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

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

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

Player Position And Look (clientbound)

Updates the player's position on the server. This packet will also close the “Downloading Terrain” screen when joining/respawning.

If the distance between the last known position of the player on the server and the new position set by this packet is greater than 100 meters, the client will be kicked for “You moved too quickly :( (Hacking?)”.

Also if the fixed-point number of X or Z is set greater than 3.2E7D the client will be kicked for “Illegal position”.

Yaw is measured in degrees, and does not follow classical trigonometry rules. The unit circle of yaw on the XZ-plane starts at (0, 1) and turns counterclockwise, with 90 at (-1, 0), 180 at (0, -1) and 270 at (1, 0). Additionally, yaw is not clamped to between 0 and 360 degrees; any number is valid, including negative numbers and numbers greater than 360.

Pitch is measured in degrees, where 0 is looking straight ahead, -90 is looking straight up, and 90 is looking straight down.

Packet ID State Bound To Field Name Field Type Notes
0x34 0x35 Play Client X Double Absolute or relative position, depending on Flags.
Y Double Absolute or relative position, depending on Flags.
Z Double Absolute or relative position, depending on Flags.
Yaw Float Absolute or relative rotation on the X axis, in degrees.
Pitch Float Absolute or relative rotation on the Y axis, in degrees.
Flags Byte Bit field, see below.
Teleport ID VarInt Client should confirm this packet with Teleport Confirm containing the same Teleport ID.
Dismount Vehicle Boolean True if the player should dismount their vehicle.

About the Flags field:

<Dinnerbone> It's a bitfield, X/Y/Z/Y_ROT/X_ROT. If X is set, the x value is relative and not absolute.
Field Bit
X 0x01
Y 0x02
Z 0x04
Y_ROT 0x08
X_ROT 0x10

Resource Pack Send

Packet ID State Bound To Field Name Field Type Notes
0x38 0x39 Play Client URL String (32767) The URL to the resource pack.
Hash String (40) A 40 character hexadecimal and lowercase SHA-1 hash of the resource pack file. (must be lower case in order to work)
If it's not a 40 character hexadecimal string, the client will not use it for hash verification and likely waste bandwidth — but it will still treat it as a unique id
Forced Boolean The notchian client will be forced to use the resource pack from the server. If they decline they will be kicked from the server.

Tags

Packet ID State Bound To Field Name Field Type Notes
0x5B 0x5C Play Client
Block Tags (See below) IDs are block IDs
Item Tags (See below) IDs are item IDs
Fluid Tags (See below) IDs are fluid IDs
Entity Tags (See below) IDs are entity IDs
Length of the array VarInt
Array of tags Tag type Array Identifier Tag identifier (Vanilla required tags are minecraft:block, minecraft:item, minecraft:fluid, minecraft:entity_type, and minecraft:game_event)
Array of Tag (See below)

Tags look like:

Field Name Field Type Notes
Length VarInt Number of elements in the following array
Tags Tag name Array Identifier
Count VarInt Number of elements in the following array
Entries Array of VarInt Numeric ID of the given type (block, item, etc.).


Serverbound

Client Settings

Sent when the player connects, or when settings are changed.

Packet ID State Bound To Field Name Field Type Notes
0x05 Play Server Locale String (16) e.g. en_GB.
View Distance Byte Client-side render distance, in chunks.
Chat Mode VarInt Enum 0: enabled, 1: commands only, 2: hidden. See processing chat for more information.
Chat Colors Boolean “Colors” multiplayer setting.
Displayed Skin Parts Unsigned Byte Bit mask, see below.
Main Hand VarInt Enum 0: Left, 1: Right.
Disable text filtering Boolean Disables filtering of text on signs and written book titles. Currently always true (i.e. the filtering is disabled)

Displayed Skin Parts flags:

  • Bit 0 (0x01): Cape enabled
  • Bit 1 (0x02): Jacket enabled
  • Bit 2 (0x04): Left Sleeve enabled
  • Bit 3 (0x08): Right Sleeve enabled
  • Bit 4 (0x10): Left Pants Leg enabled
  • Bit 5 (0x20): Right Pants Leg enabled
  • Bit 6 (0x40): Hat enabled

The most significant bit (bit 7, 0x80) appears to be unused.

Handshaking

Clientbound

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

Serverbound

Handshake

This causes the server to switch into the target state.

Packet ID State Bound To Field Name Field Type Notes
0x00 Handshaking Server Protocol Version VarInt See protocol version numbers (currently 754 Snapshot 15)
Server Address String Hostname or IP, e.g. localhost or 127.0.0.1, that was used to connect. The Notchian server does not use this information. Note that SRV records are a complete redirect, e.g. if _minecraft._tcp.example.com points to mc.example.org, users connecting to example.com will provide mc.example.org as server address in addition to connecting to it.
Server Port Unsigned Short Default is 25565. The Notchian server does not use this information.
Next State VarInt Enum 1 for status, 2 for login

Status

Clientbound

No changes so far.

Serverbound

No changes so far.

Login

Clientbound

No changes so far.

Serverbound

No changes so far.