what's a valid domain name?

Mark Andrews marka at isc.org
Sun Jan 30 05:50:45 UTC 2011

In message <20110130013241.DFF772D18F at mail.nsbeta.info>, pyh at mail.nsbeta.info wri
> Mark Andrews writes:
> > 
> > Remember domain names are not the same things as hostnames.  Hostnames
> > are limited to letter digit hyphen (LDH).  Other domain names are not
> > limited and things last SRV records deliberately use labels that are
> > not legal in hostnames to prevent collisions of the two namespaces when
> > they are stored in the DNS. 
> > 
> Could you show an example for the difference between a hostname and a 
> domain name? 

_http._srv.example.com is not a hostname but is a domain name.
example.com is a hostname and a domain name.
> Thanks again. 
> Regards.
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org

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