OS | Operation | Field | Note |
Windows XP/2000 | ipconfig /all | "Physical Address" | Windows uses '-' as the delimiter |
Mac OS/X LAN | System Preferences | Network; pick location; pick what to show; click "Ethrnet" tab. | "Ethernet ID" |
Mac OS/X Wireless LAN | System Preferences | Network; pick location; pick "AirPort" to show; click "AirPort" tab | "AirPort ID" |
Linux | ifconfig -a | "HWaddr" of "eth0" or any appropriate network adaptor | |
Solaris | ifconfig -a | string after "ether" of "le0" or any appropriate network adaptor | leading "0" is striped off |
!FreeBSD | dmesg | | |