Whois & RDAP

There are two versions of the WHOIS service.

The first version is a classical Unix WHOIS service as specified in RFC 1834. This service features recursive results for all associated objects and inverse queries.

The second version is a web WHOIS application. The web version supports hyperlinked and more detailed results. There is even a possibility to enable CAPTCHA protection against robots.

Both versions contain the security feature of hiding personal information of contacts.

Additionally, the FRED contains a prototype implementation of the RDAP protocol which allows client applications to obtain results in a more recent, machine-readable format (JSON).