2026.01.24 6e2d4fc36 inventory

Inventory Packets

Version: 2026.01.24-6e2d4fc36

This category contains 10 packet(s).

Packet Index

ID	Name	Package	Compressed	Max Size
0xAA	UpdatePlayerInventory	com.hypixel.hytale.protocol.packets.inventory	Yes	1600 MB
0xAB	SetCreativeItem	com.hypixel.hytale.protocol.packets.inventory	No	15.6 MB
0xAC	DropCreativeItem	com.hypixel.hytale.protocol.packets.inventory	No	15.6 MB
0xAD	SmartGiveCreativeItem	com.hypixel.hytale.protocol.packets.inventory	No	15.6 MB
0xAE	DropItemStack	com.hypixel.hytale.protocol.packets.inventory	No	12 bytes
0xAF	MoveItemStack	com.hypixel.hytale.protocol.packets.inventory	No	20 bytes
0xB0	SmartMoveItemStack	com.hypixel.hytale.protocol.packets.inventory	No	13 bytes
0xB1	SetActiveSlot	com.hypixel.hytale.protocol.packets.inventory	No	8 bytes
0xB2	SwitchHotbarBlockSet	com.hypixel.hytale.protocol.packets.inventory	No	15.6 MB
0xB3	InventoryAction	com.hypixel.hytale.protocol.packets.inventory	No	6 bytes

---

UpdatePlayerInventory

Property	Value
Packet ID	0xAA (170)
Compressed	Yes
Fixed Block Size	2 bytes
Variable Field Count	7
Max Size	1600 MB
Nullable Bit Field	1 byte(s)
Variable Block Start	30

Fields

Name	Type	Offset	Size	Encoding	Nullable
storage	InventorySection	-1	var	nested:InventorySection	Yes
armor	InventorySection	-1	var	nested:InventorySection	Yes
hotbar	InventorySection	-1	var	nested:InventorySection	Yes
utility	InventorySection	-1	var	nested:InventorySection	Yes
builderMaterial	InventorySection	-1	var	nested:InventorySection	Yes
tools	InventorySection	-1	var	nested:InventorySection	Yes
backpack	InventorySection	-1	var	nested:InventorySection	Yes
sortType	SortType	1	1	byte	No

Layout Notes: Fixed block contains nullable bits at offset 0, sortType at offset 1, offsets to variable data at offsets 2, 6, 10, 14, 18, 22, 26 respectively.

sortType enum values:

• 0 = Name
• 1 = Type
• 2 = Rarity

---

SetCreativeItem

Property	Value
Packet ID	0xAB (171)
Compressed	No
Fixed Block Size	9 bytes
Variable Field Count	1
Max Size	15.6 MB
Variable Block Start	9

Fields

Name	Type	Offset	Size	Encoding	Nullable
inventorySectionId	int	0	4	int32_le	No
slotId	int	4	4	int32_le	No
item	ItemQuantity	-1	var	nested:ItemQuantity	No
override	boolean	8	1	byte	No

Layout Notes: Fixed block contains inventorySectionId, slotId, override; item is variable-length starting at offset + 9

---

DropCreativeItem

Property	Value
Packet ID	0xAC (172)
Compressed	No
Variable Field Count	1
Max Size	15.6 MB

Fields

Name	Type	Offset	Size	Encoding	Nullable
item	ItemQuantity	0	var	nested:ItemQuantity	No

Layout Notes: Packet contains a single variable-length ItemQuantity field with no fixed header or nullable bits

---

SmartGiveCreativeItem

Property	Value
Packet ID	0xAD (173)
Compressed	No
Fixed Block Size	1 bytes
Variable Field Count	1
Max Size	15.6 MB
Variable Block Start	1

Fields

Name	Type	Offset	Size	Encoding	Nullable
item	ItemQuantity	-1	var	nested:ItemQuantity	No
moveType	SmartMoveType	0	1	byte	No

Layout Notes: Fixed block contains only moveType byte at offset 0. Item field is variable-length, starting at offset 1.

moveType enum values:

• 0 = EquipOrMergeStack
• 1 = PutInHotbarOrWindow
• 2 = PutInHotbarOrBackpack

---

DropItemStack

Property	Value
Packet ID	0xAE (174)
Compressed	No
Fixed Block Size	12 bytes
Variable Field Count	0
Max Size	12 bytes
Variable Block Start	12

Fields

Name	Type	Offset	Size	Encoding	Nullable
inventorySectionId	int	0	4	int32_le	No
slotId	int	4	4	int32_le	No
quantity	int	8	4	int32_le	No

Layout Notes: Fixed block contains three 4-byte integers at offsets 0, 4, and 8 respectively

---

MoveItemStack

Property	Value
Packet ID	0xAF (175)
Compressed	No
Fixed Block Size	20 bytes
Variable Field Count	0
Max Size	20 bytes
Variable Block Start	20

Fields

Name	Type	Offset	Size	Encoding	Nullable
fromSectionId	int	0	4	int32_le	No
fromSlotId	int	4	4	int32_le	No
quantity	int	8	4	int32_le	No
toSectionId	int	12	4	int32_le	No
toSlotId	int	16	4	int32_le	No

Layout Notes: Fixed block contains 5 integer fields, total size 20 bytes, no variable section or nullable bits

---

SmartMoveItemStack

Property	Value
Packet ID	0xB0 (176)
Compressed	No
Fixed Block Size	13 bytes
Variable Field Count	0
Max Size	13 bytes
Variable Block Start	13

Fields

Name	Type	Offset	Size	Encoding	Nullable
fromSectionId	int	0	4	int32_le	No
fromSlotId	int	4	4	int32_le	No
quantity	int	8	4	int32_le	No
moveType	SmartMoveType	12	1	byte	No

Layout Notes: All fields are fixed size and located sequentially from the offset. No nullable bits or variable fields.

moveType enum values:

• 0 = EquipOrMergeStack
• 1 = PutInHotbarOrWindow
• 2 = PutInHotbarOrBackpack

---

SetActiveSlot

Property	Value
Packet ID	0xB1 (177)
Compressed	No
Fixed Block Size	8 bytes
Variable Field Count	0
Max Size	8 bytes
Variable Block Start	8

Fields

Name	Type	Offset	Size	Encoding	Nullable
inventorySectionId	int	0	4	int32_le	No
activeSlot	int	4	4	int32_le	No

Layout Notes: Fixed block contains two 4-byte integers at offsets 0 and 4. No nullable bits or variable section.

---

SwitchHotbarBlockSet

Property	Value
Packet ID	0xB2 (178)
Compressed	No
Fixed Block Size	1 bytes
Variable Field Count	1
Max Size	15.6 MB
Nullable Bit Field	1 byte(s)
Variable Block Start	1

Fields

Name	Type	Offset	Size	Encoding	Nullable
itemId	String	-1	var	var_string:utf8	Yes

Layout Notes: Fixed block contains nullable bits at offset 0; variable data (itemId) stored starting at offset 1, with offset stored in variable section if needed

---

InventoryAction

Property	Value
Packet ID	0xB3 (179)
Compressed	No
Fixed Block Size	6 bytes
Variable Field Count	0
Max Size	6 bytes
Variable Block Start	6

Fields

Name	Type	Offset	Size	Encoding	Nullable
inventorySectionId	int	0	4	int32_le	No
inventoryActionType	InventoryActionType	4	1	byte	No
actionData	byte	5	1	byte	No

Layout Notes: Fixed block contains 3 fields: inventorySectionId (4 bytes), inventoryActionType (1 byte), actionData (1 byte). No nullable bits or variable-length fields.

inventoryActionType enum values:

• 0 = TakeAll
• 1 = PutAll
• 2 = QuickStack
• 3 = Sort

---

Back to Home