What is the whois server for .gmx?
By default, whois server for .gmx TLD is whois-fe1.gmx.tango.knipp.de. This can be used to fetch the .gmx domain/website whois information. Extension .gmx sponsoring organisation is 1&1 Mail & Media GmbH and its registered on 07-08-2014.
Sponsoring Organisation Details
1&1 Mail & Media GmbH
Brauerstrasse 48
76135 Karlsruhe
Baden-Württemberg
Germany
Usage
whois -h <whois server> <domain name>
For example
whois -h whois-fe1.gmx.tango.knipp.de hiox.gmx