Finding Your Ethernet Hardware Address
Every Ethernet device has a built-in unique identification number supplied by the manufacturer.
An Ethernet Hardware Address (also known as an adapter address, hardware address, EHA, or MAC address) is six bytes long, but it is normally written as 12 characters using hexadecimal notation, where the digits 0-9 are supplemented by the letters A-F. Some utilities present all 12 characters together, while others separate each pair of numbers (representing one of the six bytes) by a colon or dash. The same address might be displayed in any of the following formats:
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