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Every ethernet card that has been manufactured has its own unique identification number called its MAC (Media Access Control) address (sometimes referred to as a hardware address). The address itself is most often expressed as a set of six pairs of hexidecimal digits separated by a colon, like this:
00:60:08:A8:83:B3
The command to show the MAC address differs from OS to OS:
AIX: the MAC address can be viewed using the netstat -ia command.
HP-UX: the MAC address can be viewed using the lanscan command under the heading Station Address.
IRIX: will display the hardware address with the command nvram eaddr. It should be noted that you can also display this address and its decimal counterpart using the sysinfo -vv command.
Linux: To see the hardware address on a Linux machine you can use the ifconfig command. The value will be next to the HWaddr heading.
Solaris: arp -a | grep hostname will show you the system's MAC address.
Tru64 UNIX: netstat -ia will show you the station's MAC address.
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