> How exactly do we determine what other sites are hosted on a > given server, i.e., sites that don't appear in spams? IOW > how do you know there's "one internal site"?
You'ld think that there should be some way to do a reverse DNS to determine from an ip the domains that exist on that ip. I suspect though that the whole internet fabric is designed the other way around, and that this information is probably something that no single registrar would know. In theory I'd think that one could process zone files to determine what existed on any given ip that was advertized and accessible by name. However, getting one's hands on the zone files in the first place... Loren