How do I find my computer's IP and hardware address?

• For Windows XP or 2000:
  1. Click the Start button.
  2. Choose Run.
  3. Type cmd in the Run dialog box and then click OK.
  4. In the command prompt window, type ipconfig /all and then hit Enter.
  5. Write down the IP Address and Physical Address. The Physical Address is your computer's hardware adddress.
     Note: There may be more than one set of numbers. Look at the Description of each set. If you cannot tell which is important, you may want to write all of them down.
• For Macintosh OS X:
  1. Go to the Apple Menu.
  2. Choose About This Mac and then, in the window that pops up, click the More Info button.
  3. The System Profiler will come up. On the left, choose Network and then, on the right, choose the appropriate adapter.
  4. Write down the IP Address and Ethernet Address that are listed in the bottom right. The Ethernet Address is the hardware address.