A MAC address is a physical hardware address assigned to each device that has the capability of connecting to a network. The internet is nothing more than a large network. The MAC address is something that is assigned in the chip on the device and is not something the user can change.
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Brian has been a website administrator with WhatIsMyIP.com since early 2006. He's known in the forum as WIMIAdmin. He has an extensive computer background that started back in the early 80's when his mom bought him his first computer, a Texas Instruments TI-99/4A. Brian has turned his passion for technology into a full time gig.