![]() ![]() That is around 40,000 MAC addresses for every human alive today. Since the length of the MAC address is 48 bits, the total number of possible MAC addresses is 2 48 (= ~ 281.4 trillion). Note that hardware from different vendors may happen to share the same device portion of the address. Among all devices manufactured with the same vendor prefix, each is given their own unique 24-bit number. The rightmost digits of a MAC address represent an identification number for the specific device. For example, the prefixes:Ġ0:13:10, 00:25:9C and 68:7F:74 (plus many others) all belong to Linksys (Cisco Systems). Vendors often possess many prefix numbers associated with their different products. Each vendor registers and obtains MAC prefixes as assigned by the IEEE (Institute of Electrical and Electronics Engineers) organization. ![]() The leftmost 6 digits (24 bits) called “prefix” are associated with the adapter manufacturer. That is, every letter can take on a value between 0 and F and uses 4 bits. The addresses is usually represented in hexadecimal notation, as above. ![]()
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