Hardware or MAC Addresses

Every network interface has a hardware address. These interfaces include network cards, network probing equipment and other things like advanced switches. These addresses are 6 bytes long and are usually written in two character hex sets separated by colons (01:23:45:67:89:ab) or dashes (01-23-45-67-89-ab). These addresses are used so that two computers next to each other can talk to each other.