> Mark Andrews wrote: > > > The Internet went to multi-label hostnames ~20 years ago. > > As noted in RFC 2821 as "one dot required" syntax, also > mentioned in RFC 3696. Recently *overruled* by 2821bis. There is a difference between allowing protocol to be used in a "local" only mode (single label) and a "global" mode (multi-label) and saying you must support single label in a global context. Single label names are local in scope. Attempting to use them in a global context does not work. As the names in "." get more interesting the probability of collisions with existing names goes up. Not many people choose two letter labels for the least significant parts of their host names unless they are choosing their initials. Museum on the other hand is a real English word. I'm sure you will find lots other uses of "museum" in the DNS. The same thing will happen with other TLD's as the rules are relaxed. Single label hostnames are not globally unique. They SHOULD NOT be used in a context where globally unique names are required. Mark -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: Mark_Andrews@xxxxxxx _______________________________________________ Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf