Mac-address (OS X)
If you have an external network card (USB or Thunderbolt) connect it to your computer. Open System Preferences app. You can search for it with Spotlight (ctrl + Spacebar)
or launch directly from Applications folder
In system preferences click Network
In the next window choose Ethernet (if you have an in-built network card), USB Ethernet (if your card is connected to USB port) or Thunderbolt – Ethernet (if your card is connected to Thunderbolt port) and click Advanced…
Then click Hardware
And that’s it! The MAC-Address is in the upper line.
