![]() ![]() The first 3 bytes (24 bits) represent the manufacturer of the card, and the last 3 bytes (24 bits) identify the particular card from that manufacturer. ![]() The uniqueness of MAC addresses is ensured by the Institute of Electrical and Electronics Engineers ( IEEE), which assigns networking device vendors specific blocks of MAC addresses for the devices they produce. MAC addresses can be hard-coded into circuitry or stored in read-only memory (ROM), and they can be configured using vendor-supplied software. MAC Address is a unique 6-byte (48-bit) address that is usually permanently burned into a network interface card ( NIC) or other physical-layer networking device and that uniquely identifies the device on an Ethernet-based network.Ī MAC address is also known as an Ethernet address, hardware address, physical address, or PHY address. Definition of MAC Address in Network Encyclopedia.
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