Well, any decently operated chunk of the net has an in-addr.arpa entry for
every IP address that is active on its net. (Modulo hiding for security
reasons.)
Here at cavebear I've got quite a few in-addr.arpa delegations, the main
one being 17.203.192.in-addr.arpa (This is a zone, not a leaf node in the
DNS.)
In any case, these are used merely for IP to name lookups and they aren't
the kind of thing that I think we normally mean when we talk about Domain
Names in the normal sense.
(By-the-way, it just struck me that in H323, which is the basis for IP
telephony, one of the ways to represent a "phone number" is a person's
e-mail address. Now, when we talk about domain names being really and
actually used for telephone access, there is absolutely no doubt that the
bulk of the people affected are individuals, not corporations.)
--karl--
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