A1.net

DAVx⁵ has been successfully tested with A1.net.

A1.net is an Austrian ISP who also provides CardDAV-capable Webmail.

DAVx⁵ settings (CardDAV)

To synchronize A1.net Webmail contacts with DAVx⁵, use "Login with URL/user name".

Base URL: https://carddav.a1.net
User name/password: your A1.net user name/password