WHOIS Clients Apps and Alternatives

WHOIS is a query/answer protocol widely used for finding out information about a certain IP addres or domain name.

This type of information can be obtained by simply entering a domain name in any dedicated WHOIS search engine or desktop app.
 
WHOIS clients will display the name, phone number and address of the owner or administrator of the given domain (if they are public information).

Apps capable of performing WHOIS queries may also help users to find out if a specific domain is available or already registered.