What is a MAC address?
A media access control address (MAC address) is an unique identifier assigned to a network interface of any device (i.e. computers, mobile phones, routers...) with a network card. All wired (ethernet) and wireless IEEE 802 network interfaces need to have an unique MAC address, for to be able to communicate at the data link layer of a network segment. In a MAC address there are encoded specific vendor information such as the registered company identification number.