| 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 |   |   |