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Are the MAC addresses of Wi-Fi, Ethernet and Bluetooth devices assigned in the same address space? Or are MAC address unique irrespective of the physical layer? Is there a possibility of MAC address collision if Wi-Fi (or Ethernet) and Bluetooth devices reused the MAC address? While routers bridge WLAN and Ethernet LAN, I have not seen any device that bridges Bluetooth and LAN (Ethernet or WLAN). Do such devices exist?

  • You seems to have multiple questions. How about pick one? – Ramhound Jan 8 '15 at 1:43
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Yes, they're all IEEE EUI-48's (EUI == Extended Unique Identifier), and the IEEE Registration Authority manages the address space to guarantee uniqueness. The first 24 bits is an Organizationally Unique Identifier (OUI). Each OUI is assigned to a particular company by the IEEE. That company can then make 2^24 unique MAC addresses with that OUI as the prefix. It's the company's responsibility to make sure they never program the same MAC address onto more than one device or interface.

  • If MACs were reused - by say a student working on a project, can there be a possible collision between Bluetooth, WLAN and ethernet? – Lord Loh. Jan 8 '15 at 15:05
  • @LordLoh. Yes there can. – Spiff Jan 8 '15 at 17:15
  • Could you give me an example of a gateway that bridges a Bluetooth and LAN / WLAN? I could not find any. Thank you for the answer :-) – Lord Loh. Jan 8 '15 at 18:09

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