How to find a MAC address
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From the machine in question
Linux
/sbin/ifconfig -a HWaddr 00:30:48:70:FA:20
IRIX
(as root)
/usr/sysadm/bin/sysmgr
Click on "About This System". Ethernet Address: 08:00:69:0E:6F:00
Solaris/SunOS
(as root)
/usr/sbin/ifconfig -a ether 8:0:20:7c:ee:67
Windows 95
winipcfg Adapter Address: 00-04-E2-06-AC-EC
Windows 98/NT/2000/XP
ipconfig /all Physical Address: 00-04-E2-06-AC-EC
OS X
System Preferences -> Network -> Configure -> Built-in Ethernet -> TCP/IP -> Ethernet Address
From a remote Linux box
ping 123.45.67.89; /sbin/arp -a 123.45.67.89