John Horne wrote:
> I haven't re(read) the RFC's regarding domain syntax, but do these
> "number-only" domains exist? I'va always assumed that the domain must have,
> at least one, letter in it, and that probably the top-level domain would
> contain letters (e.g. .com, .edu, .gov, etc).
Philip Hazel wrote:
> I don't think any numerical top-level domains actually exist, but
> syntactically they could.
AFAIK, there are no top-level domains with digits in at all, and it's highly
unlikely the InterNIC would ever agree to the creation of an all-digit one.
But all-digit components certainly exist further down the tree (e.g. "400.com")
and with [dns_]search_parents in effect a user-specified e-mail address of the
form myname@19.43.67.163 is theoretically possible, even within the public DNS
world.
And of course there are private DNS worlds; and for that matter RFC 822 domains
don't have to be resolved through the DNS at all.
Chris Thompson Cambridge University Computing Service,
Email: cet1@??? New Museums Site, Cambridge CB2 3QG,
Phone: +44 1223 334715 United Kingdom.
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