At 02:33 -0400 on 07/14/2005, Valdis(_dot_)Kletnieks(_at_)vt(_dot_)edu wrote about Re:
draft-klensin-rfc2821bis-00.txt structural and textual :
On Thu, 14 Jul 2005 00:58:32 EDT, "Robert A. Rosenberg" said:
being everything to the right of the @-sign). The Domain part has a
host if there are more levels than the number defined for the WhoIs
Are you sure that basing it off the whois is the proper referent for this?
Yes. I am defining "Domain" based on ownership and control of that
level (and those to the left of it) in a FQDN. For TLDs ORG/NET/COM
and other non-National TLDs this is at the 2nd level. IOW, Panix.Com
is a Domain Name and all *.Panix.Com FQDNs are owned/controlled by
the owner of Panix.Com (who can be determined from a WhoIs lookup).
For national TLDs such as UK or AU, there are addition levels before
you get to the ownership level (IOW: If Panix were registered as a UK
Domain it would be Panix.CO.UK not just Panix.UK). What I was
pointing out (or trying to say) is that a .COM domain name is 2
levels. If there was a 3-level .COM FQDN then the first (Left Most)
level is a Hostname in the 2-level domain. Any 4 or longer .COM FQDN
still has the first level as Hostname while all other levels to the
left of the 2nd level are subdomains in that 2-level domain.