The FRITZ!Repeater only supports WireGuard in combination with a MyFRITZ! or dynamic DNS address. This ensures that WireGuard connections can can be established from mobile networks that have already been converted from IPv4 to IPv6 as well as from Wi-Fi hotspots or company networks that do not support IPv6 yet.

You can also use MyFRITZ! or DynDNS if you are using the FRITZ!Repeater on an internet connection with a fixed ("static") public IPv4 address. The FRITZ!Repeater can then be reached via its MyFRITZ! or DynDNS address under both the fixed IPv4 and the changing IPv6 address.