Media Access Control (MAC) address is a unique identifier attached to most networking devices (such as router, Ethernet cards etc).

This address is some time required. For example, there is famous engineering expensive software. This software needs your unique MAC address to issue you license and necessary software installation keys. Some time MAC address used for filtering purpose (firewall or sniffers) or diagnosing network problems .

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Linux or UNIX: How to find out or display the Ethernet Address (MAC)

Originally from nixCraft by nixcraft

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