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How to obtain the Ethernet (MAC) address of a machine

Windows

Click Start->Run-> type "cmd" and press Enter, or, if you're using Windows 10, right-click Start and select Command Prompt.
Type "ipconfig /all" and press Enter
Look for Ethernet adapter Local Area Connection, the Physical Address field contains the Ethernet address.

OSX

Open System Preferences and click on the Network icon
Select your connection method on the left (eg. AirPort, Ethernet)
Click the Advanced... button.
Click the Ethernet tab to show the ethernet ID.

Linux

As the root user type "ifconfig -a"
From the displayed information, find eth0 (this is the default first Ethernet adapter)
Locate the number next to the HWaddr. This is your Ethernet address.