Download URL : http://developer.apple.com/library/mac/#samplecode/GetPrimaryMACAddress/Introduction/Intro.html

LICENSE
/*
File:GetPrimaryMACAddress.c	
Description: This sample application demonstrates how to do retrieve the Ethernet MAC address of the 
built-in Ethernet interface from the I/O Registry on Mac OS X. Techniques shown include finding the 
primary (built-in) Ethernet interface,finding the parent Ethernet controller, and retrieving properties 
from the controller's I/O Registry entry.

                
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