Is there anyway to search a list of domain names and to tell where the dns is pointing at without checking them manually?

I sell a lot of domains and I would like a easier way to check the domains to see when the nameservers are changed so I can remove the site from my server. Right now I have to manually do a whois on each domain to see if the nameservers have been changed.

any suggestions?

Thanks Jason

you can get access to the registry zone files which has a listing of each domain and where its pointed to.

Domain Name Analyzer should do the trick.

Can't remember the URL. Do a search on google I'm sure you'll find it.

Thanks guys :)

there is some ready made softwares that uses zone files todo this job too:
1- http://www.dropscripts.com/zone_files.html
2- http://www.domainpunch.com/products/dna/
2- http://www.domainpunch.com/products/dnapro/

Thanks :)

most welcome :)