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what dictates p2p0 address?

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For an ad-hoc or Wifi-Direct interface, which usually seems to be
named p2p0, I'm finding that the MAC address mirrors the Wifi card's
MAC address for octets 2-6, but it seems as though octet 1 is dynamic.
 So, for example:

Wifi: 7c:d1:c3:e0:a6:81
p2p0: 0e:d1:c3:e0:a6:81

This is true across a bunch of devices that I own, but I can't seem to
find a definitive answer to how octet 1 is mutated to choose the p2p0
address.

Is this something chosen randomly, or is it a function of some other
part of the address?

- George
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