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Whois

Whois is a TCP-based transaction-oriented query/response protocol that is widely used to provide information services to Internet users.

Whois as a service is used for submitting a query to a database and find out information from a domain like: the name and address of the organization "owning" the domain; its administrative, technical, and zone contacts; the host names and network addresses of sites providing name service for the domain.

Type a domain (for example: hs-offenburg.de or mit.edu) in the application linked in the right side to see if it is already registered. 
 

RIPE Database Query

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