The first three octets can be used to identify the manufacturer of the NIC. Since it is a 48-bit address, it is typically represented as six groups of two hexadecimal digits, usually separated by a colon. A MAC address, sometimes called the hardware address, is a 48-bit globally unique address found in the Network Interface Card (NIC) of a computer. Address Resolution Protocol (ARP) maps MAC addresses to an IP address.
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