If you need to do some higher level network configuration you may need to find your MAC address. MAC stands for media access control and is a unique way of identifying your network card and your Mac. Every Mac address is unique, therefor if makes your Mac unique. Sometimes you need this address if you need to allow your Mac onto a network. I needed my Mac address to allow my computer onto my university network.
Using System Preferences
The quickest method for finding your MAC address is to use System Preferences. Open System Preferences and select the Network preference pane.
Select the network method you are using (eg Wi-Fi). Then select the Advance option at the bottom of the pane.
On the first page of the advance options you will notice at the bottom of the screen the MAC address. You can select this text to copy to the clipboard
If you use Wi-Fi or Ethernet they will each have a different address, since they can both be independently accessed when switched on.
You can use Terminal for this, however it does need a little bit more interpretation and can be easy to get wrong.
If you want to use Terminal enter the following command:
ifconfig en0 ether
This will display the MAC address in a similar method to that found within System Preferences.
Typically en0 will be Ethernet and en1 will be Wi-Fi.
It is very simple to find your MAC address. I prefer the System Preference method since it is the simplest.