To see the devices connected to your Zyxel router:
1. While you are connected to the Zyxel router's WiFi, open any browser and navigate to 192.168.1.1. The default username admin and the password 1234.
2. Select the Status icon on the left side of the screen. At the bottom, under the summary section, there will be a WLAN 2.4G and WLAN 5G status section.
3. Click the Details link on each one to see what devices are connected to each network.