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From: braden@ISI.EDU
Newsgroups: comp.protocols.tcp-ip
Subject: Re: Underscores
Message-ID: <9103022334.AA04582@braden.isi.edu>
Date: 2 Mar 91 23:34:07 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 4

RFC-1123 (Section 2.1) points you to RFC-952, and then liberalizes the
syntax to allow "3COM.COM".

Bob Braden