The MACFinder application was designed to be a small tool that will allow you to display your MAC addresses. This tool will find up to 16 NIC cards.
MAC stands for Media Access Control, and is a unique 48-bit (6 Bytes) hexadecimal number assigned to a NIC when it is manufactured. And it is unique; you'll not find two NICs with the same MAC Address in the world. The first three octets (24 bits) are known as the Organizationally Unique Identifier (OUI) and identifies its manufacturer.
It means the MAC address of all cards of a company that say X start with a particular fixed number at the beginning. I'm not sure if this address is just assigned to Ethernet Cards or any other types of network Interface or equipment. This address is typically written as six colon/dash-separated hexadecimal numbers.
