Entity metadata

Mobs

Mobs are spawned via Spawn Mob. There are two extra mob types in the code that refer to mobs classes that can never spawn: Mob and Monster (they are always subclasses, aka another more specific type).

Type	Name	x, z	y
48	Mob	N/A	N/A
49	Monster	N/A	N/A
50	Creeper	0.6	1.8
51	Skeleton	0.6	1.95
52	Spider	1.4	0.9
53	Giant Zombie	0.6 * 6	1.8 * 6
54	Zombie	0.6	1.8
55	Slime	0.51000005 * size	0.51000005 * size
56	Ghast	4	4
57	Zombie Pigman	0.6	1.8
58	Enderman	0.6	2.9
59	Cave Spider	0.7	0.5
60	Silverfish	0.4	0.3
61	Blaze	0.6	1.8
62	Magma Cube	0.51000005 * size	0.51000005 * size
63	Ender Dragon	16.0	8.0
64	Wither	0.9	3.5
65	Bat	0.5	0.9
66	Witch	0.6	1.8
67	Endermite	0.4	0.3
68	Guardian	0.85	0.85
69	Shulker	1	1
90	Pig	0.9	0.9
91	Sheep	0.9	1.3
92	Cow	0.9	1.3
93	Chicken	0.4	0.7
94	Squid	0.95	0.95
95	Wolf	0.6	0.8
96	Mooshroom	0.9	1.3
97	Snowman	0.7	1.9
98	Ocelot	0.6	0.8
99	Iron Golem	1.4	2.9
100	Horse	1.4	1.6
101	Rabbit	0.6	0.7
120	Villager	0.6	1.8

Objects

Objects are spawned via Spawn Object. See Object Data for more details.

ID	Name	x, z	y
1	Boat	1.5	0.6
2	Item Stack (Slot)	0.25	0.25
3	Area Effect Cloud	?	?
10	Minecart	0.98	0.7
11 (unused since 1.6.x)	Minecart (storage)	0.98	0.7
12 (unused since 1.6.x)	Minecart (powered)	0.98	0.7
50	Activated TNT	0.98	0.98
51	EnderCrystal	2.0	2.0
60	Arrow (projectile)	0.5	0.5
61	Snowball (projectile)	0.25	0.25
62	Egg (projectile)	0.25	0.25
63	FireBall (ghast projectile)	1.0	1.0
64	FireCharge (blaze projectile)	0.3125	0.3125
65	Thrown Enderpearl	0.25	0.25
66	Wither Skull (projectile)	0.3125	0.3125
67	Shulker Bullet	0.3125	0.3125
70	Falling Objects	0.98	0.98
71	Item frames	varies	varies
72	Eye of Ender	0.25	0.25
73	Thrown Potion	0.25	0.25
74	Falling Dragon Egg	0.98	0.98
75	Thrown Exp Bottle	0.25	0.25
76	Firework Rocket	0.25	0.25
77	Leash Knot	0.5	0.5
78	ArmorStand	0.5	2.0
90	Fishing Float	0.25	0.25
91	Spectral Arrow	0.5	0.5
92	Tipped Arrow	0.5	0.5
93	Dragon Fireball	0.3125	0.3125

Since release 1.6, all minecarts are spawned with object type 10 and their functionality is then specified in the Data field within the packet. Also, their visual appearance may be sent via the Entity Metadata packet.

Entity Metadata Format

Note that entity metadata is a totally distinct concept from block metadata. All entities must send at least one item of metadata, in most cases this will be the health item.

An Entity Metadata is an array of entries, each of which looks like the following:

Name	Type	Meaning
Index	Unsigned Byte	Unique index key determining the meaning of the following value, see the table below. If this is 0xff then the it is the end of the Entity Metadata array and no more is read.
Type	Optional Byte Enum	Only if Index is not 0xff; the type of the index, see the table below
Value	Optional value of Type	Only if Index is not 0xff: the value of the metadata field

Value of Type field	Type of Value field	Notes
0	Byte
1	VarInt
2	Float
3	String
4	Chat
5	Slot
6	Boolean
7	Rotation	3 floats: rotation on x, rotation on y, rotation on z
8	Position
9	OptPosition (Boolean + Optional Position)	Position is present if the Boolean is set to true
10	Direction (VarInt)	???
11	OptUUID (Boolean + Optional UUID)	UUID is present if the Boolean is set to true
12	BlockID (VarInt)	id << 4 | data

Entity classes also recursively use fields from classes they extend.

Entity

The base class.

Index	Type	Meaning
0	Byte	Bit mask	Meaning
		0x01	On Fire
		0x02	Crouched
		0x08	Sprinting
		0x10	Eating/drinking/blocking
		0x20	Invisible
		0x40	Glowing effect
		0x80	Flying with elytra
1	VarInt	Air
2	String	Custom name
3	Boolean	Is custom name visible
4	Boolean	Is silent

Potion

Extends Entity.

Index	Type	Meaning
5	Slot	Potion which is thrown

FallingBlock

Extends Entity.

Index	Type	Meaning
5	Position	spawn position

AreaEffectCloud

Extends Entity.

Index	Type	Meaning
5	Float	Radius
6	VarInt	Color (only for mob spell particle)
7	Boolean	Ignore radius and show effect as single point, not area
8	VarInt	Particle ID

FishingHook

Extends Entity.

Index	Type	Meaning
5	VarInt	hooked entity id

Arrow

Extends Entity.

Index	Type	Meaning
5	Byte	Bit mask	Meaning
		0x01	Is critical

TippedArrow

Extends Arrow.

Index	Type	Meaning
6	VarInt	Color

Boat

Extends Entity.

Index	Type	Meaning
5	VarInt	Time since last hit
6	VarInt	Forward direction
7	Float	Damage taken
8	VarInt	Type
9	Boolean	Unknown (probably something with the paddles)
10	Boolean	Unknown (probably something with the paddles)

EnderCrystal

Extends Entity.

Index	Type	Meaning
5	OptPosition	Beam target
6	Boolean	Show bottom

Fireball

Extends Entity.

No additional metadata.

WitherSkull

Extends Fireball.

Index	Type	Meaning
5	Boolean	Invulnerable

Fireworks

Extends Entity.

Index	Type	Meaning
5	Slot	Firework info

Hanging

Extends Entity.

No additional metadata.

ItemFrame

Extends Hanging.

Index	Type	Meaning
5	Slot	Item
6	VarInt	Rotation

Item

Extends Entity.

Index	Type	Meaning
5	Slot	Item

Living

Extends Entity.

Index	Type	Meaning
5	Byte	Likely used to limit placing blocks from both hands at the same time.
		Bit mask	Meaning
		0x01	Is hand active
		0x02	Active hand (0 = main hand, 1 = offhand)
6	Float	Health
7	VarInt	Potion effect color
8	Boolean	Is potion effect ambient
9	VarInt	Number of arrows in entity

Player

Extends Living.

Index	Type	Meaning
10	Float	Additional Hearts
11	VarInt	Score
12	Byte	Skin Flags
13	Byte	Main hand (0 : Left, 1 : Right)

ArmorStand

Extends Living.

Index	Type	Meaning
10	Byte	Bit mask	Meaning
		0x01	is Small
		0x02	has Gravity
		0x04	has Arms
		0x08	no BasePlate
		0x10	set Marker
11	Rotation	Head rotation
12	Rotation	Body rotation
13	Rotation	Left arm rotation
14	Rotation	Right arm rotation
15	Rotation	Left leg rotation
16	Rotation	Right leg rotation

Insentient

Extends Living.

Index	Type	Meaning
10	Byte	Bit mask	Meaning
		0x01	NoAI
		0x02	Left handed

Ambient

Extends Insentient.

No additional metadata.

Bat

Extends Ambient.

Index	Type	Meaning
11	Byte	Is hanging

Creature

Extends Insentient.

No additional metadata.

Ageable

Extends Creature.

Index	Type	Meaning
11	Boolean	Is baby

Animal

Extends Ageable.

No additional metadata.

Horse

Extends Animal.

Index	Type	Meaning
12	Byte	Bit mask	Meaning
		0x01	Unused
		0x02	Is Tame
		0x04	Is saddled
		0x08	Has Chest
		0x10	Is Bred (not used on the Notchian server; controlled via the unused Bred NBT flag)
		0x20	Is eating
		0x40	Is rearing (on hind legs)
		0x80	Is mouth open
13	VarInt	Variant
14	VarInt	Color & Style
15	OptUUID	Owner
16	VarInt	Armor

Pig

Extends Animal.

Index	Type	Meaning
12	Boolean	Has saddle

Rabbit

Extends Animal.

Index	Type	Meaning
12	VarInt	Type

Sheep

Extends Animal.

Index	Type	Meaning
12	Byte	Status bit mask (color, sheared)

TameableAnimal

Extends Animal.

Index	Type	Meaning
12	Byte	Bit mask	Meaning
		0x01	is sitting
		0x04	is tamed
13	OptUUID	Owner

Ocelot

Extends TameableAnimal.

Index	Type	Meaning
14	VarInt	Type

Wolf

Extends TameableAnimal.

Index	Type	Meaning
14	Float	Damage taken (used for tail rotation)
15	Boolean	Is begging
16	VarInt	Collar color

Villager

Extends Ageable.

Index	Type	Meaning
12	VarInt	Profession (Type)

Golem

Extends Creature.

No additional metadata.

IronGolem

Extends Golem.

Index	Type	Meaning
11	Byte	Is player-created

Snowman

Extends Golem.

Index	Type	Meaning
10	Byte	Bit mask	Meaning
		0x10	has no pumpkin hat

Shulker

Extends Golem.

Index	Type	Meaning
11	Direction	Facing direction
12	OptPosition	Attachment position
13	Byte	Shield height

Monster

Extends Creature.

No additional metadata.

Blaze

Extends Monster.

Index	Type	Meaning
11	Byte	Is on fire

Creeper

Extends Monster.

Index	Type	Meaning
11	VarInt	State (-1 = idle, 1 = fuse)
12	Boolean	Is charged
13	Boolean	Is ignited

Guardian

Extends Monster.

Index	Type	Meaning
11	Byte	Bit mask	Meaning
		0x02	is retracting spikes
		0x04	is elderly
12	VarInt	Target EID

Skeleton

Extends Monster.

Index	Type	Meaning
11	VarInt	Type
12	Boolean	Is swinging arms (Used to animate arms for melee attacks; only used when the skeleton does not have a bow in its hand)

Spider

Extends Monster.

Index	Type	Meaning
11	Byte	Is climbing

Witch

Extends Monster.

Index	Type	Meaning
11	Boolean	Is aggresive

Wither

Extends Monster.

Index	Type	Meaning
11	VarInt	First head's target
12	VarInt	Second head's target
13	VarInt	Third head's target
14	VarInt	Invulnerable time

Zombie

Extends Monster.

Index	Type	Meaning
11	Boolean	Is baby
12	VarInt	Is villager (0 for zombie, profession+1 for villagers)
13	Boolean	Is converting
14	Boolean	Are hands held up

Enderman

Extends Monster.

Index	Type	Meaning
11	BlockID	Carried block
12	Boolean	Is screaming

EnderDragon

Extends Insentient.

Index	Type	Meaning
11	VarInt	Dragon phase

Flying

Extends Insentient.

No additional metadata.

Ghast

Extends Flying.

Index	Type	Meaning
11	Boolean	Is attacking

Slime

Extends Insentient.

Index	Type	Meaning
11	VarInt	Size

Minecart

Extends Entity.

Index	Type	Meaning
5	VarInt	Shaking power
6	VarInt	Shaking direction
7	Float	Shaking multiplier
8	VarInt	Block ID and damage
9	VarInt	Block Y position
10	Boolean	Show block

MinecartCommandBlock

Extends Minecart.

Index	Type	Meaning
11	String	Command
12	Chat	Last output

MinecartFurnace

Extends Minecart.

Index	Type	Meaning
11	Boolean	Is powered

TNTPrimed

Extends Entity.

Index	Type	Meaning
5	VarInt	Fuse time