How to Find MAC Address in Ubuntu / Debian Linux

MAC address is the unique serial number of your Network Card. It is SIX TWO-Digit HEX Numbers Separated by Column(:). By using MAC number You can Identify your Network Card Manufacturer. By using the simple command ifconfig you can find your MAC Address. 

Open a terminal and type ifconfig , you will get a text output. In the  first line you can see like HWaddr: 00:BA:13:67:78:76.