I know that you can literally use hundreds of scripts that lookup a domain name or IP and display information about that domain or IP. Most of those sites are rather slow and / or have so much advertisement on their websites that I prefer to use WhosIP from Nirsoft when I quickly want to lookup an IP.
WhosIP displays the IP owner, contact information (always an email address, but often phone and fax as well), country where that IP is located and additional information. Maybe you are asking yourself why someone would need that kind of information. This is important if someone attacks your computer for instance, or if someone spams your website and you want to check on his IP to find someone to contact about the spam.
WhosIP is a command line utility for Windows. You unpack it into a directory of your choice and use the command whosip domain/IP to get information about that domain or IP.
The additional parameter -r displays additional information that is not displayed if you don’t use it. An example would be whosip -r www.ghacks.net to receive extensive information about the hoster of Ghacks.
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There’s also an online whois client which performs universal whois queries: http://www.whoistheowner.net
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