[H-GEN] Allowable chars in a host name?
Michael Anthon
michael at anthon.net
Mon Aug 4 07:26:48 EDT 2003
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Robert Brockway wrote:
>
> There used to be a restriction on a domainname starting with a numeral.
> I believe this restriction was lifted some years ago (don't haven an rfs
> reference on me), meaning that this is now a valid domainname. Yes, it is
> a scary world :)
BAH! I hate being wrong, from RFC 1123, which UPDATES but does not
supercede RFC 1034. One wonders how anyone ever gets this stuff right...
> 2.1 Host Names and Numbers
> The syntax of a legal Internet host name was specified in RFC-952
> [DNS:4]. One aspect of host name syntax is hereby changed: the
> restriction on the first character is relaxed to allow either a
> letter or a digit. Host software MUST support this more liberal
> syntax
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