Network-Binding Wildcard

I’m just looking for a way to see if someone is logged into my guest network.
Is it possible to insert a wildcard into the network-binding or the fritzbox-tr069-binding?

network:pingdevice:guest [hostname=“192.168.189.*”] is not working

This cannot work. The network binding pings the target and you can’t perform a ping to a multicast address. If you have access to the router you use the http binding and read out the admin web page or similar.

you could have a short list of available dhcp addresses and network:pingdevice for each in the list ( provided the devices show up with a simple ping )