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MAC OSX - Finding I.P. and MAC address for the ethernet adapter

Go to the Apple menu and click System Preferences.

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This brings up System Preferences, as shown below. Click on Network

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The Network preferences pane is shown below. Make sure that Ethernet is selected and note the IP address on the right panel. Click on Advanced to bring up more information about the Ethernet connection

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Click on the Ethernet tab to bring up the panel shown below. Note the Ethernet ID. This is the MAC address for your computer's Ethernet adapter.

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Alternative Method

In spotlight search for Terminal 

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Enter the command "ifconfig -l" to list your network adapters

Pick the network adapter you use (most likely en0) and type "ifconfig en0"

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Your IP will be listed next to "inet" .Your MAC will be listed next to "ether"

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Locating your IP Address and MAC address

1. On your Mac, choose Apple menu   > System Preferences, then click Network.
   
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2. Click the "Advanced..." button.
   
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3. With the menu buttons at the top of the window, you can locate both your IP address and your MAC address.
    

4. For your IP address, choose the TCP/IP tab.
   
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5. For your MAC address choose the Hardware tab.
   
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