Go to Settings > System > About > Network.

Follow the steps below to determine the hardware address of your Amazon Fire TV.

1) From the Fire TV's home screen, go to Settings.

2) Scroll to the right and choose System.

3) Scroll down and choose About.

4) Scroll down to Network. The Fire TV's hardware address will be located on the bottom right-hand corner of the screen.

Outcome

You will have the hardware address for your device.