Currently Being ModeratedJun 16, 2013 1:26 PM (in response to lsklar)
Well, if you look at the "about" on the settings menu of the ATV the MAC# will show but I guess you can't even get there if you haven't got the ATV on your network. The box the ATV came in might have the MAC addy on the label with the Model and serial #'s also you may try making your router so it will not need a MAC addy to join. Look at the ATV, write down the MAC addy, then turn the feature on your router back on and enter the ATV's MAC addy...
Hope this helps!
Currently Being ModeratedJun 16, 2013 2:19 PM (in response to lsklar)
Something else I just thought of...
There is an app I got for my iPhone called " Network Analyzer Lite", it's free, that shows you all of the things, locally, that are Wi-Fi. (not necessarily on your network) It also shows you their MAC addresses...