The model regions on Apple wikis are missing some entries- and the entries are lacking some information that I would be critical for international buyers: there are some extreme differences between features in some regions: FaceTime support, Dual SIM support, etc.
What's worse is some regions have multiple codes, and sometimes even imported devices from other regions.
Unfortunately, Apple does not seem to acknowledge these region numbers exist at all and resort to nebulous claims about the feature differences, and it doesn't help that there are some conflicting reports on the internet.
So I'm going to try my best to maintain an up-to-date list. Any and all confirmations, additions and denials here would be extremely helpful. Please just leave a comment.