0x26 S26PacketMapChunkBulk

Sends multiple chunks at once. Used for initial world load and large area updates.

Clientbound (Server → Client) · PLAY · net/minecraft/network/play/server/S26PacketMapChunkBulk.java
worldchunk

Fields

FieldTypeDescription
chunksChunk[]Array of chunk data with X/Z/bitmask/compressed data
skyLightSentbooleanWhether skylight data is included

Wire Encoding

FieldTypeNotes
Sky LightboolIncludes skylight
Column CountVarInt
Per Columnint,int,short,VarInt,byte[]X, Z, bitmask, dataSize, compressed data

MCP References

MCPNetHandlerPlayClient.handleMapChunkBulk()

Handler Interface

HNDINetHandlerPlayClient

Notes

S26 is the bulk version of S21 — sends many chunks in a single packet. Used on world join and loading large areas. XRay modules also cancel S26 alongside S21 to prevent chunk updates.

implementation Implementation Cases

XRay (Tenacity 6.0)

Same as S21 but for bulk chunk loading. XRay modifies bulk data.

Vanilla hook: EventReceivePacket
Search (Tenacity 6.0)

Same as S21 but for bulk chunk loading. XRay modifies bulk data.

Vanilla hook: EventReceivePacket
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