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If I change my network interface card on my MacBook Air 2013, which I assume to be my AirPort/Bluetooth card, will it change my laptop's MAC Address?

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Yes, that is correct; it will change.

Your MAC (Media Access Control) address is assigned to network interfaces, not to the computer. For example, on this WiFi adapter from a Macbook Pro, you can see the MAC address imprinted on the chip (circled in red)

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You can even lookup the manufacturer of the WiFi adapter by entering the first six characters into a lookup tool like this one. In this case, "58b035" comes back as "Apple, Inc"

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  • Keep in mind that if you need to access something using a certain MAC address that it can be temporally changed. – Jacob Wood Jun 26 '16 at 2:36

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