<P> MAC spoofing is a technique for changing a factory - assigned Media Access Control (MAC) address of a network interface on a networked device . The MAC address that is hard - coded on a network interface controller (NIC) cannot be changed . However, many drivers allow the MAC address to be changed . Additionally, there are tools which can make an operating system believe that the NIC has the MAC address of a user's choosing . The process of masking a MAC address is known as MAC spoofing . Essentially, MAC spoofing entails changing a computer's identity, for any reason, and it is relatively easy . </P> <P> The changing of the assigned MAC address may allow the bypassing of access control lists on servers or routers, either hiding a computer on a network or allowing it to impersonate another network device . MAC spoofing is done for legitimate and illicit purposes alike . </P>

What happens if you change your mac address
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