>
>Also check out ipstuff at http://www.west-wind.com/wwIPStuff.asp
>It supports IP Address validation "Support for domain lookup from IP address and IP Address from domain name." which perhaps can be used for your purposes also. Just speculation.

I also have used the wwipstuff in the past from a download I did back when it was public domain software. As I recall, the code to return the IP address from a domain name takes a while to time out before you can trap a return code that it failed. Now the software is no longer public domain, so maybe it has more features. Perhaps I'll check it out again.

Thanks,