[Windows] list MAC addresses of ethernet-connected devices to AEBS?

I have an ethernet connected device (among others) that is running headless, so I need to create a static IP ("DHCP Reservation") based on the MAC address to SSH into the device.

This device is connected to my AEBS with an ethernet cable, and I cannot figure out where in the Airport Utility app lists MAC addresses connected by ethernet. This is very easy if it were a wirelessly connected device but it appears the Airport Utility -> Advanced -> Logging and Statistics tab -> "Logs and Statistics" only holds information of wirelessly connected devices.

I am connecting to my AEBS with the most updated Airport Utility for Windows v5.6.1

So, where do you find the MAC addresses listed of ethernet-connected devices using Windows Airport Utility?