A trivia question about domain names.

[Ronald F. Guilmette]

In message <199910070311.NAA16371 at bsdi.dv.isc.org>, you wrote:

>
>> 
>> Once upon a time, RFC 1035 made domain names like:
>> 
>> 	beverly-hills.90210.com
>> 
>> illegal, because it disallowed domain name components that contained
>> nothing but digit characters.
>> 
>> Somewhere along the line, that seems to have gotten changed, and now,
>> domain name components can consist entirely of digit sequences.
>> 
>> Can anyone help me out and tell me which RFC, specifically, amended
>> RFC 1035 so as to allow this?
>> 
>> 
>	It was never illegal according to RFC 1035.
>
>	Hostnames and mailnames (a subset of domainnames) are
>	specified by RFC 952 & RFC 821 as modified by RFC 1123.
>	Hostnames are not allowed to be all digits as it introduces
>	confusion w.r.t. literal addresses.  This is enforced by
>	not allocating all digit TLDs.

Sorry.  You are correct, of course.  It was RFC 821 I was thinking of...
not RFC 1035.

And you gave me the answer I was looking for... i.e. RFC 1123.  Thanks!