2026.01.17 4b0f30090 connection

Connection Packets

Version: 2026.01.17-4b0f30090

This category contains 4 packet(s).

Packet Index

ID	Name	Package	Compressed	Max Size
0x00	Connect	com.hypixel.hytale.protocol.packets.connection	No	37.3 KB
0x01	Disconnect	com.hypixel.hytale.protocol.packets.connection	No	15.6 MB
0x02	Ping	com.hypixel.hytale.protocol.packets.connection	No	29 bytes
0x03	Pong	com.hypixel.hytale.protocol.packets.connection	No	20 bytes

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Connect

Property	Value
Packet ID	0x00 (0)
Compressed	No
Fixed Block Size	82 bytes
Variable Field Count	5
Max Size	37.3 KB
Nullable Bit Field	1 byte(s)
Variable Block Start	102

Fields

Name	Type	Offset	Size	Encoding	Nullable
protocolHash	String	1	64	fixed_string:64	No
clientType	ClientType	65	1	byte	No
language	String	-1	var	var_string:ascii	Yes
identityToken	String	-1	var	var_string:utf8	Yes
uuid	UUID	66	16	uuid	No
username	String	-1	var	var_string:ascii	No
referralData	byte[]	-1	var	byte[]	Yes
referralSource	HostAddress	-1	var	nested:HostAddress	Yes

Layout Notes: Fixed block contains nullable bits at offset 0, offsets to variable data at offset + 102 + int32 LE values

clientType enum values:

• 0 = Game
• 1 = Editor

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Disconnect

Property	Value
Packet ID	0x01 (1)
Compressed	No
Fixed Block Size	2 bytes
Variable Field Count	1
Max Size	15.6 MB
Nullable Bit Field	1 byte(s)
Variable Block Start	2

Fields

Name	Type	Offset	Size	Encoding	Nullable
reason	String	-1	var	var_string:utf8	Yes
type	DisconnectType	1	1	byte	No

Layout Notes: Fixed block contains nullable bits at offset 0, type byte at offset 1; variable data (reason string) at offset 2+ when present

type enum values:

• 0 = Disconnect
• 1 = Crash

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Ping

Property	Value
Packet ID	0x02 (2)
Compressed	No
Fixed Block Size	29 bytes
Variable Field Count	0
Max Size	29 bytes
Nullable Bit Field	1 byte(s)
Variable Block Start	29

Fields

Name	Type	Offset	Size	Encoding	Nullable
id	int	1	4	int32_le	No
time	InstantData	-1	var	nested:InstantData	Yes
lastPingValueRaw	int	17	4	int32_le	No
lastPingValueDirect	int	21	4	int32_le	No
lastPingValueTick	int	25	4	int32_le	No

Layout Notes: Fixed block contains nullable bits at offset 0; fields are at fixed offsets as specified in the deserialize method.

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Pong

Property	Value
Packet ID	0x03 (3)
Compressed	No
Fixed Block Size	20 bytes
Variable Field Count	0
Max Size	20 bytes
Nullable Bit Field	1 byte(s)
Variable Block Start	20

Fields

Name	Type	Offset	Size	Encoding	Nullable
id	int	1	4	int32_le	No
time	InstantData	-1	var	nested:InstantData	Yes
type	PongType	17	1	byte	No
packetQueueSize	short	18	2	int16_le	No

Layout Notes: Fixed block contains nullable bits at offset 0, id at 1-4, optional time at 5-16, type at 17, packetQueueSize at 18-19

type enum values:

• 0 = Raw
• 1 = Direct
• 2 = Tick

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