MAC address
Also called: media access control address, wifi MAC
A MAC address is a 48-bit hardware identifier assigned to a network interface — wifi, Bluetooth or Ethernet. Its first three bytes identify the manufacturer through an OUI registered with the IEEE, so a MAC address implies which company built the radio.
Every network interface carries a MAC address, written as six hexadecimal pairs. The first three bytes form the Organisationally Unique Identifier, assigned by the IEEE to a specific manufacturer. Anyone can look up an OUI, which means a MAC address is a claim about who made the hardware — and a checkable one.
Where it gets contradictory
A device whose build.prop claims a Samsung handset while its wifi MAC carries an OUI belonging to a virtualisation vendor has just contradicted itself. Emulators are the usual source: virtual network adapters ship with OUIs registered to the hypervisor vendor, which no retail phone would ever carry.
Randomisation
Modern Android randomises the MAC address it broadcasts when scanning and when joining networks, precisely to stop passive tracking. That randomisation is per-network and expected — it is normal behaviour, not a red flag. What matters for device identity is the address the operating system reports locally to apps, which stays tied to the interface.
A device also carries a separate Bluetooth MAC. Both should be distinct per device, and both should be consistent with the brand the device claims.