Each network card on your computer has a built-in unique MAC (Media Access Control) address that can be used to identify your computer. This is usually fine, but it is possible to change it natively in OS X.
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How to Find and Change Your MAC Address on OS X
Each network card on your computer has a built-in unique MAC (Media Access Control) address that can be used to identify your computer. This is usually fine, but it is possible to change it natively in OS X.
Full article