Dimensions

0 - Overworld
1 - The End
-1 - The Nether

800 - Aquacavern (Caverns II)
801 - Cavelands (Caverns II)
802 - Cavenia (Caverns II)
803 - Cavern (Caverns II)
804 - Huge Cavern (Caverns II)
805 - Frost Mountains (Caverns II)
806 - Wide Desert (Caverns II)
807 - The Void (Caverns II)
808 - Dark Forest (Caverns II)
809 - Crown Cliffs (Caverns II)

810 - Moon (Galacticraft)
811 - Overworld Orbit (Galacticraft)
812 - Mars (Galacticraft)
813 - Asteroids (Galacticraft)
814 - Venus (Galacticraft)

818 - Diona (More Planets)
819 - Chalos (More Planets)
820 - Nibiru (More Planets)
821 - Fronos (More Planets)

822 - Outer Lands (Thaumcraft)

823 - The Twilight Forest 