Most NICs have the MAC addresses printed on them(not all). They sometimes print them in diffrent fashions, but just try to find any 12 hex characters. now if not printed on there without IPCONFIG, or IFCONFIG then I have no idea

Picture depicting NIC with MAC address of 00-10-47-01-00-E9 http://www007.upp.so-net.ne.jp/SY-Fi.../rtl8019as.jpg

*note* - The first six digits represent the number of the manufacturer of the NIC. The last six are the device ID.