max hostname lengths (MAXHOSTNAMELEN ?)

[Simon Waters]

Sivakumar Thiyagarajan wrote:
> 
>     Is there any maximum length for a host name or alias name for BIND
> dns entries? If so, can this max length customised?
> 
> I have obzerved that nsupdate does not allow host names more than 62 chars long ( weird number ).

rfc1035 has a size limits section.

DNS labels may not exceed 63 octets.

Hostnames should follow hostname conventions, which are
shorter but hostnames have nothing to do with DNS *8-)

You can probably customise it, anything is possible in
software, but don't expect anything else to work with a
customised version.