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It's official: .corp, .home, .mail will never be top-level domains on the 'net

Arthur the cat Silver badge

Reserved Top Level DNS Names

For that matter there are the user assigned code elements of ISO 3166-1 alpha-2. OK they are country codes rather than ccTLDs but we can be pretty certain that they won't get used as ccTLDs as it would cause too much confusion.

TL;DR version: the following two letter combinations can currently be used as non-conflicting TLDs and are highly unlikely to ever conflict in the future - AA, QM-QZ, XA-XZ, and ZZ(*).

(*) Long beards optional.

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