In router mode, the FRITZ!Box manages all IP connections to the internet so that it can forward responses from remote sites to the correct devices in the home network. The number of simultaneous IP connections is not limited by the FRITZ!Box.

Since the maximum number of IP connections depends on the usage of the FRITZ!Box's memory, in practice it can vary depending on the other functions being used at a given time (such as Wi-Fi, telephony). Experience has shown that it is always possible to have several hundred simultaneous IP connections.