RE: Too long a domain name

Having had a conversation with Geoff Wright (nominet.org.uk, registrar for
.co.uk subdomain), he returns me the same opinion.
The mentioned RFC discusses about host name tables (/etc/hosts) and not DNS
entries.

Here is his opinion:

--
Hi,
the post to squid-users is trying to relate how DNS works to an RFC about Host
Tables. DNS was designed to overcome the drawbacks of using Host Tables.
The RFC specs for DNS are RFC 1031 - RFC 1035 and subsequent updates. RFC 1034
states:
rfc1034> Each node has a label, which is zero to 63 octets in length.  Brother
rfc1034> nodes may not have the same label, although the same label can be used
rfc1034> for nodes which are not brothers.  One label is reserved, and that is
rfc1034> the null (i.e., zero length) label used for the root.
The nodes are seperated by the '.' delimter. You can have upto 512 octets in a
DNS name (includseing the delimiters).So
llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch,  being 59
characters, just comes in under the limit. Potentially they could keep adding
sub domains until the 512 octet limit is reached.  As it happens the name is
the longest in the .uk registry, aswell as the longest village name in Wales.
Registries can specify that they will only register name of a certain length,
so long as it's not greater than 63 characters. InterNIC has a limit of 20
characters which is followed by many other registries, but this is a limit
imposed by their policies not by restrictions in DNS.
Feel free to forward this to the mailing list. 
[...]
Geoff Wright
Nominet UK