What do the First Three Bytes of Mac Addresses Normally Signify??

Posted in  mac | 2022-03-21

MAC Address

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. Each group of 3 bytes can be represented by 6 hexadecimal digits, forming a 12digit hexadecimal number representing the entire MAC address .

What does the First 3 Bytes Identify in a MAC Address?

The first three bytes pairs of hexadecimal characters of any unicast address contain that vendor address component of the MAC address. The remaining three bytes carry the serial number of that vendors interface card.

What do the First 3 Bytes of a Unicast MAC Address Indicate?

The IEEE intends for unicast addresses to be unique in the universe by administering the assignment of MAC addresses . The IEEE assigns each vendor a code to use as the first 3 bytes of its MAC addresses; that first half of the addresses is called the Organizationally Unique Identifier OUI.

What does the First Part of a MAC Address Represent?

The first half (24 BITS) of a MAC address contains the ID number of the adapter manufacturer. These IDs are regulated by an Internet standards body (see sidebar). The second half (24 MORE BITS) of a MAC address represents the serial number assigned to the adapter by the manufacturer.

What do the Numbers in a MAC Address Mean?

The rightmost digits of a MAC address represent an identification number for the specific device S. Among all devices manufactured with the same vendor prefix, each is given a unique 24bit number. Hardware from different vendors may share the same device portion of the address.