reasonable length of FQDN
Gregory Hicks
ghicks at cadence.com
Wed Feb 1 19:01:49 UTC 2006
> To: comp-protocols-dns-bind at isc.org
> From: Christian Smith <csmith.lunchmeat at dyndns.org>
> Subject: Re: reasonable length of FQDN
> Date: Wed, 01 Feb 2006 12:19:10 GMT
>
> In article <drphne$cog$1 at sf1.isc.org>,
> Roman Mashak <romez777 at gmail.com> wrote:
>
> > Hello,
> >
> > what may be the reasonable length of fully-quialilfied domain name
> > that can be set up in application? I'd wish this length would cover
> > possible user desires and at the same time wouldn't violate standard.
>
> 255 characters assuming one octet per character.
Some OSes, however, further limit the HOST portion of the FQDN...
HP-UX, for example, limits the host name to a measly 8 chars. And if
someone tells me that an HP-UX host name can be longer than 8 chars, I
can tell them that HP-UX only looks at the first 8 chars when trying to
do a match...
>
> http://www.ietf.org/rfc/rfc2181.txt
>
> The DNS itself places only one restriction on the particular labels
> that can be used to identify resource records. That one restriction
> relates to the length of the label and the full name. The length of
> any one label is limited to between 1 and 63 octets. A full domain
> name is limited to 255 octets (including the separators).
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