Looking for DNS reverse lookup service

[Humes, David G.]

A few weeks ago I ran accross a for-fee service that claimed to provide all
the names associated with an IP address rather than just the single name
that you get with a typical nslookup reverse lookup.  Unfortunately, I
forgot to bookmark the site and have now googled through about 20 pages
without success.  Can anyone provide a referal for this service?

Thanks.

--Dave