By default, the RTR-NetTest (RMB-Test) uses Internet Protocol Version 6 (IPv6), if this version is available on the device. If not, the RTR-NetTest (RMB-Test) uses Internet Protocol Version 4 (IPv4).
When using the Android app it is recognizable on the home page, which version of the Internet Protocol is used. In the app you can disable the use of IPv6 under "Settings".
More information on IPv6 can be found at http://www.heise.de/ct/hotline/FAQ-IPv6-1137096.html.
RUNDFUNK UND TELEKOM
REGULIERUNGS-GMBH
Austrian Regulatory Authority for Broadcasting and Telecommunications
Mariahilfer Straße 77-79, 1060 Vienna, Austria
tel.: +43 1 58058-0