Moonbase Four

Moon Base Four is likely an Autobot base on one of Cybertron's moons, given that Moonbase One and Moonbase Two are. It's also called Cyberion.

Character profiles
Ironhide's body was severely damaged during a fight on Moon Base Four.

Wings Universe
In 2984 C.E., the Cybertronian Knights Flare-Up and Apelinq were on a mission on Cyberion when Knight Commander Ginrai called them back to base to deal with another situation.