![]() ![]() For example, consider the following MAC address: D8-D3-85-EB-12-E3Įvery hexadecimal character represents 4 bits, so the first six hexadecimal characters represent the vendor ( Hewlett Packard in this case). MAC addresses are usually written in the form of 12 hexadecimal digits. The manufacturer then assigns a unique value for the last 3 bytes, which ensures that every MAC address is globaly unique. Manufacturers agree to give all NICs a MAC address that begins with the assigned OUI. ![]() It is a hardware address, which means that it is stored in the firmware of the network card.Įvery network card manufacturer gets a universally unique 3-byte code called the Organizationally Unique Identifier (OUI). A Media Access Control (MAC) address is a 48-bit (6 bytes) address that is used for communication between two hosts in an Ethernet environment. ![]()
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