This is something that is bothering me because I guess it's my OCD but I have to know how everything works. Nothing is broken on my end, just out of curiosity. I have a virtual dedicated server, let's say it's server.rsagona.com. My customers who I host (a whopping two!) tell their registrars to point to: ns1.rsagona.com ns2.rsagona.com Here's my question. How do their registrars know the IP address of my server by just knowing ns1/ns2.rsagona.com? It can't have anything to do with the WHOIS info for rsagona.com, because rsagona.com is just a domain and the WHOIS info has nothing to do with the server. Granted rsagona.com is ALSO pointing to my server but that's just because I happen to be serving a "Welcome" screen if you go to rsagona.com (it's not really rsagona but you get the point). Can anyone explain this to a very confused individual?