How do I see guess WiFi connect devices

[Gingerwolf]

I have sent up a guest network and all working fine. But how can I see who is on this network? 
on the connection app all I can see is all connected devices on the main network.

[Client62]

Connect your mobile or laptop to the Guest Wi-Fi network,
then use a Network Scanner app to detect the connected devices.

[Cardiffman282]

Or just ask the presumably very small group of people who know the log in details for it and are currently near enough to the WiFi to use it if they are currently connected to it. 

[Adduxi]

Or use another WiFi setup with management software that shows who is using the Guest WiFi ?

[Client62]

Or don't be paranoid !

[asim18]

Monitor people's facial expressions as you turn off the guest Wi-Fi?