I've been doing some research on reverse DNS, and I think I understand most concepts of it, but I am still a little bit confused. I was wondering if someone could help clear this up for me.

I have a few IP Addresses that I purchased off of my ISP. I have a DNS box running that currently is handling the Forward DNS for my domain names and web sites I am hosting. If you do a nslookup on the IP Addresses it still lists my ISP as the host. From what I understand, correct me if I am wrong, if I setup Reverse DNS on my DNS box I should be able to be listed as the host for these IP Addresses. I messed around a little with my DNS box, but when I do a nslookup on the IPs it still gives my ISP as the host.

I have stumbled across some documentation on reverse dns but I am still a little confused about it. Some say that I have to contact my Upstream and then they can set it up so it looks at my DNS server when queries are done on the IP. I'm not sure how that works, but before I even get that far is there a way that I can lookup the IP address through my DNS box using some kind of nslookup command to at least tell if it is setup right on my end?

Also after that any suggestions where to go from there would be appreciated. Any experiences, or links on this to share would also be cool. If it helps at all, I am using Windows 2000 Server's DNS.

Thanks for any info.