[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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