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Who assigns MAC addresses?

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The first 3 bytes (24 bits) of a MAC address specify an OUI (Organizationally Unique Identifier) which is assigned by the IEEE Registration Authority. The current list of vendors and their OUI assignments are: http://standards.ieee.org/regaut...Jul 27, 2010 read more

The manufacturer agrees to give all NICs (and other Ethernet products) a MAC address that begins with its assigned 3-byte OUI. The manufacturer also assigns a unique value for the last 3 bytes, a number that manufacturer has never used with that OUI. read more

A media access control address (MAC address) of a device is a unique identifier assigned to a network interface controller (NIC) for communications at the data link layer of a network segment. MAC addresses are used as a network address for most IEEE 802 network technologies, including Ethernet and Wi-Fi. read more

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 is hard-coded on a network interface controller (NIC) and cannot be changed. read more

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