Java Edition data values/Pre-flattening/Entity IDs

Id	Hex	Icon	Egg	Entity	Savegame ID
Drops
1	1		-	Dropped item	Item
2	2		-	Experience Orb	XPOrb
Immobile
8	8		-	Lead knot	LeashKnot
9	9		-	Painting	Painting
18	12		-	Item Frame	ItemFrame
Projectiles
10	A		-	Shot arrow	Arrow
11	B		-	Thrown snowball	Snowball
12	C		-	Ghast fireball	Fireball
13	D		-	Blaze fireball	SmallFireball
14	E		-	Thrown Ender Pearl	ThrownEnderpearl
15	F		-	Thrown Eye of Ender	EyeOfEnderSignal
16	10		-	Thrown splash potion	ThrownPotion
17	11		-	Thrown Bottle o' Enchanting	ThrownExpBottle
19	13		-	Wither Skull	WitherSkull
22	16		-	Firework Rocket	FireworksRocketEntity
Blocks
20	14		-	Primed TNT	PrimedTnt
21	15		-	Falling block (gravel, sand, anvil, dragon egg)	FallingSand
Vehicles
41	29		-	Boat	Boat
42	2A		-	Minecart	MinecartRideable
43	2B		-	Minecart with Chest	MinecartChest
44	2C		-	Minecart with Furnace	MinecartFurnace
45	2D		-	Minecart with TNT	MinecartTNT
46	2E		-	Minecart with Hopper	MinecartHopper
47	2F		-	Minecart with Spawner	MinecartSpawner
Generic
48	30	-	-	Mob	Mob
49	31	-	-	Monster	Monster

Id	Hex	Icon	Egg	Entity	Savegame ID
Hostile mobs
50	32		File:Grid Spawn Creeper.png	Creeper	Creeper
51	33		File:Grid Spawn Skeleton.png	Skeleton Wither Skeleton	Skeleton
52	34		File:Grid Spawn Spider.png	Spider	Spider
53	35		-	Giant	Giant
54	36		File:Grid Spawn Zombie.png	Zombie	Zombie
55	37		File:Grid Spawn Slime.png	Slime	Slime
56	38		File:Grid Spawn Ghast.png	Ghast	Ghast
57	39		File:Grid Spawn Pig Zombie.png	Zombie Pigman	PigZombie
58	3A		File:Grid Spawn Enderman.png	Enderman	Enderman
59	3B		File:Grid Spawn Cave Spider.png	Cave Spider	CaveSpider
60	3C		File:Grid Spawn Silverfish.png	Silverfish	Silverfish
61	3D		File:Grid Spawn Blaze.png	Blaze	Blaze
62	3E		File:Grid Spawn Magma Cube.png	Magma Cube	LavaSlime
63	3F		-	Ender Dragon	EnderDragon
64	40		-	Wither	WitherBoss
66	42		File:Grid Spawn Witch.png	Witch	Witch
Passive mobs
65	41		File:Grid Spawn Bat.png	Bat	Bat
90	5A		File:Grid Spawn Pig.png	Pig	Pig
91	5B		File:Grid Spawn Sheep.png	Sheep	Sheep
92	5C		File:Grid Spawn Cow.png	Cow	Cow
93	5D		File:Grid Spawn Chicken.png	Chicken	Chicken
94	5E		File:Grid Spawn Squid.png	Squid	Squid
95	5F		File:Grid Spawn Wolf.png	Wolf	Wolf
96	60		File:Grid Spawn Mooshroom.png	Mooshroom	MushroomCow
97	61		-	Snow Golem	SnowMan
98	62		File:Grid Spawn Ocelot.png	Ocelot	Ozelot
99	63		-	Iron Golem	VillagerGolem
100	64		File:Grid Spawn Horse.png	Horse	EntityHorse
NPCs
120	78		File:Grid Spawn Villager.png	Villager	Villager
Other
200	C8		-	Ender Crystal	EnderCrystal

Note: All eggs listed above are available in Creative mode. When an egg with other entity ID is spawned into existence it's colored gray (File:Spawn Null.png) and doesn't work.