How to find the MAC address of the device with OS Windows
The fastest way to find a network adapter MAC address is to press a combination of keys Win+r, write the command cmd into the window and press Enter.
Then write the command ipconfig /all into the command prompt and press Enter.
Find a information about Ethernet adapter and its Physical Address there.
If you don't want to type at all, you can click with the right mouse button to the icon of network connection in tray (the bottom-right area of the screen) and choose Open Network and Sharing Center.
Click on the Connections: Ethernet link,
the on the Details... button,
and find there the Physical Address value.