(MAC address, also called physical address, hardware address or link address, is written inside the hardware when it is produced by the network equipment manufacturer. Both IP addresses and MAC addresses are represented in binary in the computer. The IP address is 32 bits, while the MAC address is 48 bits. The length of the MAC address is 48 bits (6 bytes), usually expressed as 12 hexadecimal numbers, separated by colons between each 2 hexadecimal numbers, such as: 08:00:20:0A:8C: 6D is a MAC address, in which the first 6 hexadecimal digits 08:00:20 represent the number of the network hardware manufacturer, which is assigned by the IEEE (Institute of Electrical and Electronics Engineers), and then the 3 hexadecimal digits 0A:8C :6D represents the serial number of a network product (such as a network card) made by the manufacturer. As long as you don't change your own MAC address, your MAC address is unique internationally.)
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