what's a valid domain name?

Vyto Grigaliunas vyto at fnal.gov
Mon Jan 31 15:50:10 UTC 2011

Although we're moving away from it, we found it useful for naming router
interfaces, i.e. te1-2.routername.company.com, without having to create a
separate sub-domain for each router.

I thought at some point periods were allowed in hostnames, and they do work
without escaping them.



> -----Original Message-----
> From: bind-users-bounces+vyto=fnal.gov at lists.isc.org [mailto:bind-
> users-bounces+vyto=fnal.gov at lists.isc.org] On Behalf Of Barry Margolin
> Sent: Sunday, January 30, 2011 4:14 PM
> To: comp-protocols-dns-bind at isc.org
> Subject: Re: what's a valid domain name?
> In article <mailman.1586.1296424051.555.bind-users at lists.isc.org>,
>  Vytautas Grigaliunas <vyto at fnal.gov> wrote:
> > What is the status of "dotted" hostnames - i.e. a period in the
> hostname
> > portion of a domain name ?
> >
> > At one point they were allowed, I believe ? What is the latest
> official RFC ?
> I don't think they've every been allowed.  Why would you need to do
> this, instead of just using another level of subdomain?  To get a
> literal period into a label, you need to escape it, e.g.
> foo\.bar.company.com instead of foo.bar.company.com.  The latter is
> allowed, always has been, and is quite common.
> --
> Barry Margolin, barmar at alum.mit.edu
> Arlington, MA
> *** PLEASE don't copy me on replies, I'll read them in the group ***
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