> ([...]. Come to think of it, I'm pretty sure the same RFC prohibited
> a leading digit in a token -- i.e. 3com.com -- and I know that's been
> relaxed.)
Well, RFC 952 ("DOD INTERNET HOST TABLE SPECIFICATION") does say
1. A "name" (Net, Host, Gateway, or Domain name) is a text string up
to 24 characters drawn from the alphabet (A-Z), digits (0-9), minus
sign (-), and period (.). Note that periods are only allowed when
they serve to delimit components of "domain style names". (See
RFC-921, "Domain Name System Implementation Schedule", for
background). No blank or space characters are permitted as part of a
name. No distinction is made between upper and lower case. The first
character must be an alpha character. The last character must not be
a minus sign or period. A host which serves as a GATEWAY should have
"-GATEWAY" or "-GW" as part of its name. Hosts which do not serve as
Internet gateways should not use "-GATEWAY" and "-GW" as part of
their names. A host which is a TAC should have "-TAC" as the last
part of its host name, if it is a DoD host. Single character names
or nicknames are not allowed.
These restrictions may be what you're thinking of - but, as you say,
they are long outdated now. RFC952 also says the hosts file can be
fetched from 10.0.0.51....
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