You can't register a ch domain with fewer than 3 characters. It's showing as available because that thing that checks available only looks if it's registered, not if it's allowed.
Technically they’re used for the Cantons so to register a two letter CH subdomain you first need to register a new Swiss Canton!
Technically they’re used for the Cantons so to register a two letter CH subdomain you first need to register a new Swiss Canton!