max hostname lengths (MAXHOSTNAMELEN ?)
Brad Knowles
brad.knowles at skynet.be
Thu Jun 28 22:54:46 UTC 2001
At 12:24 PM -0700 6/28/01, Sivakumar Thiyagarajan wrote:
> Is there any maximum length for a host name or alias name for BIND
> dns entries?
Yup. The limit is 63 characters for a single label element, and
255 characters for the entire fully-qualified domain name.
> If so, can this max length customised?
Nope. This is written into the standard and the protocol.
> I have obzerved that nsupdate does not allow host names more than 62
> chars long ( weird number ).
Are you sure it's 62 characters and not 63?
> Am I dealing with an nsupdate limit here or is it a DNS limit on
> hostname lengths ?
It's a DNS limit, and it cannot be changed (well, not without
completely breaking the DNS, since no other nameservers on the planet
will be able to deal with it).
--
Brad Knowles, <brad.knowles at skynet.be>
/* efdtt.c Author: Charles M. Hannum <root at ihack.net> */
/* Represented as 1045 digit prime number by Phil Carmody */
/* Prime as DNS cname chain by Roy Arends and Walter Belgers */
/* */
/* Usage is: cat title-key scrambled.vob | efdtt >clear.vob */
/* where title-key = "153 2 8 105 225" or other similar 5-byte key */
dig decss.friet.org|perl -ne'if(/^x/){s/[x.]//g;print pack(H124,$_)}'
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