MAC Addresses
A MAC address is a network device's hard-coded identification number. Because MAC addresses never change (unlike IP addresses, which are assigned by the network) they are used to register student’s computers. They are comprised of a 12-digit combination of 0-9 and A-F, with every two characters separated by a colon.
Windows XP
- From the Start menu, select “Run” in the bottom-right corner.
- At the prompt, type “cmd” and click OK.
- A black window should then open. In here, type ipconfig –all, and press enter.
- The MAC address is the Physical Address. Make sure you're looking at the one listed under Local Area Connection instead of wireless! – See an example

Windows Vista
- Open the Start Menu and type "command" in the search field. Right-click on Command Prompt and select “Run as Administrator.“
- If a security warning comes up, select Continue.
- A black window should then open. In here, type ipconfig -all, and press enter.
- The MAC address is the Physical Address. Make sure you're looking at the one listed under Local Area Connection instead of wireless! – See an example

Mac OS X
- The easiest way to obtain the MAC address in OSX is via the Network Utility.
- From the Applications folder, browse to “Utilities.” Network Utility should be in here.
- The MAC address should be listed in the top-left corner under "Hardware Address."
Linux:
- Open a terminal window and type ifconfig –a, then press enter.
- The number corresponding to “HWaddr” is the MAC address.
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