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	1.7
51	Skeleton	0.6	1.99
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	1.4
93	Chicken	0.4	0.7
94	Squid	0.8	0.8
95	Wolf	0.6	0.85
96	Mooshroom	0.9	1.3
97	Snowman	0.7	1.9
98	Ocelot	0.6	0.8
99	Iron Golem	1.4	2.7
100	Horse	1.4	1.6
101	Rabbit	0.4	0.5
102	Polar Bear	1.3	1.4
120	Villager	0.6	1.95

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
50	Activated TNT	0.98	0.98
51	EnderCrystal	2.0	2.0
60	Tipped arrow (projectile; also used for regular arrows)	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
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
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)	(Down = 0, Up = 1, North = 2, South = 3, West = 4, East = 5)
11	OptUUID (Boolean + Optional UUID)	UUID is present if the Boolean is set to true
12	OptBlockID (VarInt)	0 for absent otherwise, 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
5	Boolean	No gravity

Potion

Extends Entity.

Index	Type	Meaning
6	Slot	Potion which is thrown

FallingBlock

Extends Entity.

Index	Type	Meaning
6	Position	spawn position

AreaEffectCloud

Extends Entity.

Index	Type	Meaning
6	Float	Radius
7	VarInt	Color (only for mob spell particle)
8	Boolean	Ignore radius and show effect as single point, not area
9	VarInt	Particle ID
10	VarInt	Particle parameter 1
11	VarInt	Particle parameter 2

FishingHook

Extends Entity.

Index	Type	Meaning
6	VarInt	Hooked entity id + 1, or 0 if there is no hooked entity

Arrow

Extends Entity.

Abstract base class for TippedArrow (which is used for regular arrows as well as tipped ones) and Spectral Arrow.

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

TippedArrow

Extends Arrow.

Used for both tipped and regular arrows. If not tipped, then color is set to 0 and no tipped arrow particles are used.

Index	Type	Meaning
7	VarInt	Color (0 for no particles)

Boat

Extends Entity.

Index	Type	Meaning
6	VarInt	Time since last hit
7	VarInt	Forward direction
8	Float	Damage taken
9	VarInt	Type
10	Boolean	Right paddle turning
11	Boolean	Left paddle turning

EnderCrystal

Extends Entity.

Index	Type	Meaning
6	OptPosition	Beam target
7	Boolean	Show bottom

Fireball

Extends Entity.

No additional metadata.

WitherSkull

Extends Fireball.

Index	Type	Meaning
6	Boolean	Invulnerable

Fireworks

Extends Entity.

Index	Type	Meaning
6	Slot	Firework info

Hanging

Extends Entity.

No additional metadata.

ItemFrame

Extends Hanging.

Index	Type	Meaning
6	Slot	Item
7	VarInt	Rotation

Item

Extends Entity.

Index	Type	Meaning
6	Slot	Item

Living

Extends Entity.

Index	Type	Meaning
6	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)
7	Float	Health
8	VarInt	Potion effect color (or 0 if there is no effect)
9	Boolean	Is potion effect ambient: reduces the number of particles generated by potions to 1/5 the normal amount
10	VarInt	Number of arrows in entity

Player

Extends Living.

Index	Type	Meaning
11	Float	Additional Hearts
12	VarInt	Score
13	Byte	The Displayed Skin Parts bit mask that is sent in Client Settings
		Bit mask	Meaning
		0x01	Cape enabled
		0x02	Jacket enabled
		0x04	Left sleeve enabled
		0x08	Right sleeve enabled
		0x10	Left pants leg enabled
		0x20	Right pants leg enabled
		0x40	Hat enabled
		0x80	Unused
14	Byte	Main hand (0 : Left, 1 : Right)

ArmorStand

Extends Living.

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

Note that armor stands with the invisible flag from the base entity class set also cannot be attacked or damaged, except for by the void.

Insentient

Extends Living.

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

Ambient

Extends Insentient.

No additional metadata.

Bat

Extends Ambient.

Index	Type	Meaning
12	Byte	Bit mask	Meaning
		0x01	Is hanging

Creature

Extends Insentient.

No additional metadata.

Ageable

Extends Creature.

Index	Type	Meaning
12	Boolean	Is baby

Animal

Extends Ageable.

No additional metadata.

Horse

Extends Animal.

Index	Type	Meaning
13	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
14	VarInt	Type
15	VarInt	Variant (Color & Style)
16	OptUUID	Owner
17	VarInt	Armor

Pig

Extends Animal.

Index	Type	Meaning
13	Boolean	Has saddle

Rabbit

Extends Animal.

Index	Type	Meaning
13	VarInt	Type

Polar Bear

Extends Animal.

Index	Type	Meaning
13	Boolean	Standing up

Sheep

Extends Animal.

Index	Type	Meaning
13	Byte	Bit mask	Meaning
		0x0F	Color (matches dye damage values)
		0x10	Is sheared

TameableAnimal

Extends Animal.

Index	Type	Meaning
13	Byte	Bit mask	Meaning
		0x01	Is sitting
		0x02	Is angry (only used with wolves)
		0x04	Is tamed
14	OptUUID	Owner

Ocelot

Extends TameableAnimal.

Index	Type	Meaning
15	VarInt	Type

Wolf

Extends TameableAnimal.

Index	Type	Meaning
15	Float	Damage taken (used for tail rotation)
16	Boolean	Is begging
17	VarInt	Collar color (values are those used with dyes)

Villager

Extends Ageable.

Index	Type	Meaning
13	VarInt	Profession (Farmer = 0, Librarian = 1, Priest = 2, Blacksmith = 3, Butcher = 4)

Golem

Extends Creature.

No additional metadata.

IronGolem

Extends Golem.

Index	Type	Meaning
12	Byte	Bit mask	Meaning
		0x01	Is player-created

Snowman

Extends Golem.

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

Shulker

Extends Golem.

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

Monster

Extends Creature.

No additional metadata.

Blaze

Extends Monster.

Index	Type	Meaning
12	Byte	Bit mask	Meaning
		0x01	Is on fire

Creeper

Extends Monster.

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

Guardian

Extends Monster.

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

Skeleton

Extends Monster.

Index	Type	Meaning
12	VarInt	Type (Normal = 0, Wither = 1, Stray = 2)
13	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
12	Byte	Bit mask	Meaning
		0x01	Is climbing

Witch

Extends Monster.

Index	Type	Meaning
12	Boolean	Is aggresive

Wither

Extends Monster.

Index	Type	Meaning
12	VarInt	Center head's target (entity ID, or 0 if no target)
13	VarInt	Left(?) head's target (entity ID, or 0 if no target)
14	VarInt	Right(?) head's target (entity ID, or 0 if no target)
15	VarInt	Invulnerable time

Zombie

Extends Monster.

Index	Type	Meaning
12	Boolean	Is baby
13	VarInt	Zombie type (0 for zombie, profession+1 for villagers, 6 for Husk)
14	Boolean	Is converting
15	Boolean	Are hands held up

Enderman

Extends Monster.

Index	Type	Meaning
12	Opt BlockID	Carried block
13	Boolean	Is screaming

EnderDragon

Extends Insentient.

Index	Type	Meaning
12	VarInt	Dragon phase

Flying

Extends Insentient.

No additional metadata.

Ghast

Extends Flying.

Index	Type	Meaning
12	Boolean	Is attacking

Slime

Extends Insentient.

Index	Type	Meaning
12	VarInt	Size

Minecart

Extends Entity.

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

MinecartCommandBlock

Extends Minecart.

Index	Type	Meaning
12	String	Command
13	Chat	Last output

MinecartFurnace

Extends Minecart.

Index	Type	Meaning
12	Boolean	Is powered

TNTPrimed

Extends Entity.

Index	Type	Meaning
6	VarInt	Fuse time