Free visual IP Lookup tool for Windows. If you have a domain name, you can use one of the numerous Whois tools to determine its owner. Whois provides complete information about the owner of any domain name, up to the level of mailing addresses and telephone numbers.
But what if you don’t have a domain name? What if all you have is a mere IP address? Or what if you don’t need information about the domain name, but are much more interested in who owns the Web server where it’s hosted?