Whois

Whois is an ideal application for professionals who work on the Internet and have to gather information about different domains.

You just need to read the name of the application to understand what Whois does. This tiny program can instantly give you all the registry data of any domain you ask for. Whois searches through different databases that collect this type of information such as Network Solutions, Arsys, GoDaddy, etc.

Along with getting information about domains, you can also use Whois to find out more about a specific IP address.