That's an issue with many devices, often for privacy reasons they don't reveal their MAC.
Apple's, for example...
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2016-05-17, 10:57 #121---
learn more about iPeng, the iPhone and iPad remote for the Squeezebox and
Logitech UE Smart Radio as well as iPeng Party, the free Party-App,
New: iPeng 9, the Universal App for iPhone, iPad and Apple Watch