Note that the first byte of the source address is alwaysĮven (since the least significant bit, or first bit on the wire Annex terminal serversĠ20406 BBN BBN internal usage (not registered)Ġ2CF1F CMC Masscomp Silicon Graphics Prime EXLĠ80003 ACC (Advanced Computer Communications)Ġ80014 Excelan BBN Butterfly, Masscomp, Silicon GraphicsĠ8002F Prime Computer Prime 50-Series LHC300Ġ80045 ? (maybe Xylogics, but they claim not to know this number)Ġ80089 Kinetics AppleTalk-Ethernet interfaceĪA0003 DEC Global physical address for some DEC machinesĪA0004 DEC Local logical address for systems running DECNET AsĬorresponds to an interface manufactured by Sun MicrosystemsĪ more complete list follows: 00000C CiscoĠ00032 GPT Limited (reassigned from GEC Computers Ltd)Ġ000A6 Network General (internal assignment, not for products)Ġ000C6 HP Intelligent Networks Operation (formerly Eon Systems)Ġ00102 BBN BBN internal usage (not registered)Ġ08064 Wyse Technology / Link TechnologiesĠ0802D Xylogics, Inc. the first 3 bytes of a MAC source address). Some of the blocks of assigned vendor MACĪddresses (i.e. Not multicast nor broadcast, so the second hex digit (readingįrom the left) will be even, not odd.
The addresses associated with interface cards are source addresses, The IEEE-assigned addresses allow each vendor to assign their own interface serial numbers (this is a flat addressing scheme), but also allows protocol monitors to examine the first 3 bytes of a frame address to determine the manufacturere of the interface card being used.
The special address of all zeros (as shown below) is reserved for nodes that currently have no configured MAC address: Interface) and the last/right 6 digits which specify the interface serial number for that interface controller vendor (this gives 256 cubed addresses - or 16.78 million separate serial numbers). The 12 hex digits of source address consist of the first/leftĦ digits (which should match the vendor of the Ethernet network ) which could in the future be internet enabled!!! Source Address Assignment In practice, the address assignment policy (using flad addressing) will inevitably lead to some wastage - but even so, there are likely to be enougth addresses for ever computer, piece of networking equipment and a large numebr of household/office devices (heating systems, ovens, washing machines, fridges, drinks dispensors, security alarms, video recorders. This is more than 56,000 MAC addresses for each person on the planet! They might be written unhyphenated (e.g., 123456789ABC), or with one hyphen (e.g., 123456-789ABC), but should be written hyphenated by octets (e.g., 12:34:56:78:9A:BC). Ethernet MAC address Assignments Ethernet MACĮthernet hardware addresses are 48 bits, expressed as 12 hexadecimal digits (0-9, plus A-F, capitalized).
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