Have you tried it with lower security settings in your router?
That way you could connect to your WiFi and check in your router for the connected devices - including their MAC addresses.
Or if your router is too simple for these details type "netsh wlan show all" into the command prompt - it will list your network summary, the MAC addresses should show up under "interfaces" and "network mode".
After you found the MAC address you can use it and get back to your full security settings only allowing known devices.
There are some tools for android as well but they only show the Mac address if the pad is connected to a network - like Network signal info for example.
So if you can't change the security of the router you might have to find a free WiFi hotspot first to use the Nework signal info tool for your MAC address.
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