All networking interfaces come with their own special address already configured, that would be the media access control address the MAC address, the MAC address is often referred to as the physical address or the burned-in address of the interface.
While MAC addresses may be changed or spoofed. Most often it’s set by the manufacturer and never actually changes. Now switches and other OSI layer two devices rely upon that MAC address in order to get network packets to their correct destinations.
The MAC address has a specific format. Actually, it has two specific formats. One is 48 bits in length, and the other is 64 bits in length. And both of them are represented by hexadecimal numbers. Both formats can be broken down into two parts, the organizationally unique identifier or all UI.
In the extended unique identifier, the EU II, the Institute of Electrical and Electronic Engineers, the I triple E assigns all electronic manufacturers their own Bo UI, which always makes up the first portion of the MAC address. Each manufacturer then assigns its own t UI to each device that is produced. Usually, it is the serial number of that device. Read more...