Earth-120

Dimension-120 (also called D-120) is an dimensional reality possibly within either the Marvel Multiverse or the Earth Prime Multiverse.

Marvel
It's possible it's within the Marvel Multiverse, within the Alternated Region of the Multiverse. This is mainly due to the similar history of Cody (who later changed his name to Tony Stark) who was later kidnapped by a terrorist group in Australia called the Twelve Rings. A group who shares a similar name to the Ten Rings, but the leader of the Twelve is called Aelos, while the Ten is lead by the Mandarin. Also, Tony is Australian.