How do I locate my MAC number?

Got my IMac to run on my Airport wireless and it operates well, however everytime the Imac goes to sleep the Network connection defaults to look for an 'ethernet' connection.  To change that default, the prompt asks me to provide my MAC number.  As I've tried various entries without success...
My thanks in advance.
Bob

To get your iMac's MAC (short for Media Access Control) address, open the Apple System Profiler (under the Apple menu, select About this Mac, and click More info). On the left side of the resulting window, under Network select Locations. Look to the right, under Services then Ethernet, below this you'll see Hardware (MAC) Address. The string of characters to the right of that is your Ethernet port's MAC address. There is a similar entry under AirPort.
Best of luck.

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