>Are you looking for a reverse dns lookup utility? Something like the function of the link below?
>
>http://remote.12dt.com/rns/
>
>You might try this:
>
>http://www.sabrainc.com/Products.asp
>


Just to follow up on Tracy's post, this site also offers numerous types of IP and domain look ups, etc...

http://www.nwtools.com/