On topic of domains

bmanning at karoshi.com bmanning at karoshi.com
Thu Jul 11 22:58:48 UTC 2013


On Fri, Jul 12, 2013 at 08:45:50AM +1000, Mark Andrews wrote:
> 
> In message <krmkg2$flc$1 at ger.gmane.org>, Chris Hills writes:
> > On 11/07/2013 15:27, Jon Mitchell wrote:
> > > 
> > > After .nyc thread, thought this IAB announcement may be of interest.
> > > 
> > > http://www.iab.org/documents/correspondence-reports-documents/2013-2/iab-st
> > atement-dotless-domains-considered-harmful/
> > > 
> > > -Jon
> > > 
> > 
> > Whilst I am not a fan of dotless domains, as long as one uses the fully
> > qualified domain name (e.g. http://ac./), there should not be any
> > trouble using it in any sane software. It seems that most people aren't
> > aware these days that a fqdn includes the trailing period (by definition).
> 
> No it does not.  Period at the end is a local convention to stop
> searching on some platforms.  It is not syntactically legal.  Note
> the words 'a sequence of domain labels separated by "."'.  Periods
> at the end are NOT legal.
> 
> RFC 1738
> 
>     host
>         The fully qualified domain name of a network host, or its IP
>         address as a set of four decimal digit groups separated by
>         ".". Fully qualified domain names take the form as described
>         in Section 3.5 of RFC 1034 [13] and Section 2.1 of RFC 1123
>         [5]: a sequence of domain labels separated by ".", each domain
>         label starting and ending with an alphanumerical character and
>         possibly also containing "-" characters. The rightmost domain
>         label will never start with a digit, though, which
>         syntactically distinguishes all domain names from the IP
>         addresses.
> 
> Mark
> -- 
> Mark Andrews, ISC
> 1 Seymour St., Dundas Valley, NSW 2117, Australia
> PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org


which explains domains like 3com.net.

the trailing dot is not illegal.

/bill





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