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Make sure your ethernet cable is connected to your computer or dock.
Open System Preferences
Select Network
In the left-hand pane, select the name of the network to which you are currently connected
Click Advanced in the lower right corner
At the bottom of the windows, the device's MAC address will be listed next to "Wi-Fi address"
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Chrome OS
Make sure your ethernet cable is connected to your computer or dock.
Click the status area, where your account picture appears
Click the section that says Connected to (and the name of your network)
At the top of the box that appears, pick beloit.edu or its.beloit.edu
In the window that opens, the MAC address is the Hardware address
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