Packets: Client-to-Server Reference

Please see Listening to Packets Guide for further details

Packet are found in the decompiled server source: "decompiled/sources/com/hypixel/hytale/protocol/packets"

Player Packets

Packets sent by the client for player actions, movement, and state updates.

Packet Name	ID	Fields
`SetClientId`	100	`clientId`
`SetGameMode`	101	`gameMode`
`SetMovementStates`	102	`movementStates`
`SetBlockPlacementOverride`	103	`enabled`
`JoinWorld`	104	`clearWorld`, `fadeInOut`, `worldUuid`
`ClientReady`	105	`readyForChunks`, `readyForGameplay`
`LoadHotbar`	106	`inventoryRow`
`SaveHotbar`	107	`inventoryRow`
`ClientMovement`	108	`movementStates`, `relativePosition`, `absolutePosition`, `bodyOrientation`, `lookOrientation`, `teleportAck`, `wishMovement`, `velocity`, `mountedTo`, `riderMovementStates`
`ClientTeleport`	109	`teleportId`, `modelTransform`, `resetVelocity`
`UpdateMovementSettings`	110	`movementSettings`
`MouseInteraction`	111	`clientTimestamp`, `activeSlot`, `itemInHandId`, `screenPoint`, `mouseButton`, `mouseMotion`, `worldInteraction`
`DamageInfo`	112	`damageSourcePosition`, `damageAmount`, `damageCause`
`ReticleEvent`	113	`eventIndex`
`DisplayDebug`	114	`shape`, `matrix`, `color`, `time`, `fade`, `frustumProjection`
`ClearDebugShapes`	115	(none)
`SyncPlayerPreferences`	116	`showEntityMarkers`, `armorItemsPreferredPickupLocation`, `weaponAndToolItemsPreferredPickupLocation`, `usableItemsItemsPreferredPickupLocation`, `solidBlockItemsPreferredPickupLocation`, `miscItemsPreferredPickupLocation`, `allowNPCDetection`, `respondToHit`
`ClientPlaceBlock`	117	`position`, `rotation`, `placedBlockId`
`UpdateMemoriesFeatureStatus`	118	`isFeatureUnlocked`
`RemoveMapMarker`	119	`markerId`

Packets sent by the client for inventory management and item manipulation.

Packet Name	ID	Fields
`UpdatePlayerInventory`	170	`storage`, `armor`, `hotbar`, `utility`, `builderMaterial`, `tools`, `backpack`, `sortType`
`SetCreativeItem`	171	`inventorySectionId`, `slotId`, `item`, `override`
`DropCreativeItem`	172	`item`
`SmartGiveCreativeItem`	173	`item`, `moveType`
`DropItemStack`	174	`inventorySectionId`, `slotId`, `quantity`
`MoveItemStack`	175	`fromSectionId`, `fromSlotId`, `quantity`, `toSectionId`, `toSlotId`
`SmartMoveItemStack`	176	`fromSectionId`, `fromSlotId`, `quantity`, `moveType`
`SetActiveSlot`	177	`inventorySectionId`, `activeSlot`
`SwitchHotbarBlockSet`	178	`itemId`
`InventoryAction`	179	`inventorySectionId`, `inventoryActionType`, `actionData`

Packets sent by the client for UI window interactions.

Packet Name	ID	Fields
`OpenWindow`	200	`id`, `windowType`, `windowData`, `inventory`, `extraResources`
`UpdateWindow`	201	`id`, `windowData`, `inventory`, `extraResources`
`CloseWindow`	202	`id`
`SendWindowAction`	203	`id`, `action`
`ClientOpenWindow`	204	`type`

Additional client-to-server packets.

Packet Name	ID	Fields
`ClientReferral`	18	`hostTo`, `data`
`SetUpdateRate`	29	`updatesPerSecond`
`SetTimeDilation`	30	`timeDilation`
`SetChunk`	131	`x`, `y`, `z`, `localLight`, `globalLight`, `data`
`SetChunkHeightmap`	132	`x`, `z`, `heightmap`
`SetChunkTintmap`	133	`x`, `z`, `tintmap`
`SetChunkEnvironments`	134	`x`, `z`, `environments`
`SetFluids`	136	`x`, `y`, `z`, `data`
`SetPaused`	158	`paused`
`SetEntitySeed`	160	`entitySeed`
`SetPage`	216	`page`, `canCloseThroughInteraction`
`SetServerAccess`	252	`access`, `password`
`SetMachinimaActorModel`	261	`model`, `sceneName`, `actorName`
`SetServerCamera`	280	`clientCameraView`, `isLocked`, `cameraSettings`
`SetFlyCameraMode`	283	`entering`
`SyncInteractionChains`	290	`updates`

From Hytale Server build 2026.01.13-dcad8778f