PS3:  https://support.us.playstation.com/app/answers/detail/a_id/978/~/how-to-find-the-ps3-mac-address

1) In the XMB™ home menu, go to Settings > System Settings and press the X button.

2) Scroll until you see [System Information] and press the X button.

3) You will see your MAC address listed

XBOX 360:

1) Settings > System Settings > Network Settings > Wireless Network > Configure Network > Additional Settings > Advanced Settings

2)You will see your MAC address listed

Apple TV:

1) Settings > About

2) You will see your MAC address listed

Roku:

1) Settings > About

2)You will see your MAC address listed

Boxee Box:

1) Settings > System > Information

2) You will see you MAC address listed

Google TV:

1) Settings > Network > Status

2)You will see your MAC address listed