How to find your MAC and IP Addresses

Wired and Wireless MAC addresses each have a unique set of characters. You must be sure you have selected the Wired address when registering your computer, or you will have to re-register with the correct MAC address.
Contact the Information Commons at extension 5-Help while you are viewing your computer's information if you are not sure which is the correct MAC address.

FOR INSTRUCTIONS, PLEASE SELECT YOUR OPERATING SYSTEM:

Windows XP/2000 | Windows Vista | Windows 98
Macintosh OS 10.4 - 10.1 (Tiger and earlier) | Macintosh OS 10.5 (Leopard)| Macintosh OS 9

WINDOWS XP/2000

1	Click the Start Button and choose the Run command from the Start menu.
2	Type cmd in the blank box. Click OK.
3	In the MS DOS windows, type ipconfig /all.
4	Write down the Wired Physical Address (see image below).
	Look at the information under Ethernet adapter Local Area Connection to register for a Wired Connection (Ethernet Adapter Wireless Network Connection is the Wireless Connection).

WINDOWS VISTA

1	Click the Start Button and select Start Search.
2	Type cmd in the blank box. Hit Enter.
3	In the command prompt window, type ipconfig /all.
4	Write down the Wired Physical Address (see image below).
	Look at the information under Ethernet adapter Local Area Connection to register for a Wired Connection (Do not use the Tunnel adapter Local Area Connection!)

WINDOWS 98
1	Click the Start Button and choose the Run command from the Start menu.
2	Type winipcfg in the blank box. Click OK.
3	Locate your Ethernet adapter information by clicking on the drop down arrow at the right of the first field and selecting the brand of your Ethernet card (NOT PPP).
4	The box labeled "Adapter Address" IS YOUR MAC ADDRESS. Any IP address currently assigned to your computer will be in the field below.

MACINTOSH OS 10.4 - 10.1
	Please note: Wired and Wireless MAC addresses are different. Look under Ethernet ID for the Wired Connection (Airport ID is the Wireless Connection).
1	From the Apple menu, choose System Preferences > Network.
2	Choose Built-in Ethernet on the Show pop-up menu, then the right most tab called Ethernet.
3	Write down the Ethernet ID; this is your wired MAC address (also known as physical address).
If you need to find the wireless MAC address, select Airport from the pull-down menu.

MACINTOSH OS 10.5 (Leopard)
	Please note: Wired and Wireless MAC addresses are different. Look under Ethernet ID for the Wired Connection (Airport ID is the Wireless Connection).
1	From the Apple menu, choose System Preferences > Network.
2	Make sure that Ethernet is highlighted on the list to the left, then select the Advanced button in the bottom right.
If you need to find the wireless MAC address, select Airport from the left instead.

3	Make sure the Ethernet button on the right is selected.
4	Write down the Ethernet ID; this is your wired MAC address (also known as a physical or hardware address).

MACINTOSH OS 9
1	Click on the Apple Menu and select Control Panels and TCP/IP.
2	Select Connect Via: Ethernet.
3	Select Configure: Manually.
4	Click the Info button or choose Get Info from the File menu.
5	The "Hardware Address" IS THE MAC ADDRESS, "This Macintosh" IS THE IP ADDRESS