Pre-release protocol

This page documents the changes from the last stable Minecraft release (currently 1.6.2, protocol 74) to the current pre-release. Note that this page contains bleeding-edge information that may not be completely or correctly documented. He 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 occured to the respective packets there.

Protocol History

None

Protocol Version

1.6.2 (74)

New Packets

Sign Placement? (0x85)

Server to Client

Sent on placement of sign. Initial byte seems to always be 0.

Packet ID	Field Name	Field Type	Example	Notes
0x85	Unknown	byte	0	Unknown, always seems to be 0.
	X	int	70	X in block coordinates
	Y	int	70	Y in block coordinates
	Z	int	-46	Z in block coordinates
Total Size:	14 bytes

Changed Packets

Entity Properties (0x2C)

Server to Client

Note: The server sends this packet to inform the user of its movement speed. Users move far too fast when this packet is not sent.

Packet ID	Field Name	Field Type	Example	Notes
0x2C	EntityID	int	195	?
	Properties Count	int	3	Number of string/data (including these lists) pairs that follow. The remaining fields here are repeated this number of times.
	Key	string16	"generic.Maxhealth"
	Value	double	20.0
	ListLength	short	1	Number of list elements that follow.
	ListElement	{long, long, double, byte}
Total Size:	? bytes

Known values:

Key	Default	Min	Max	Label
generic.maxHealth	20.0	0.0	Double.MaxValue	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	Double.MaxValue	Movement Speed
generic.attackDamage	2.0	0.0	Double.MaxValue
horse.jumpStrength	0.7	0.0	2.0	Jump Strength
zombie.spawnReinforcements	0.0	0.0	1.0	Spawn Reinforcements Chance

Removed Packets

None

Changed Data Types

None