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A TLD can have an A record. For example, http://ac/ leads to a webpage.

Also, RFC 5321 explicitly mentions the possibility of email addresses where the ___domain consists of just a TLD: http://tools.ietf.org/html/rfc5321#section-2.3.5




http://ac/ didn't work for me.


It doesn't work for me either, but http://ac./ does.


nslookup

Non-authoritative answer: Name: ac Address: 193.223.78.210

then again my upstream provider defaults to opendns.com so http://ac in the browser does not work.




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