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How-to: Determine your computer's IP address

Instructions on how to lookup the IP address of your computer while you are sitting at it.

 

These instructions only work if you are sitting at the computer you want to know the IP address of

Windows

  1. Windows 7: Click the "Windows Start Menu" and type "cmd" in the search box. Click the "cmd.exe" entry that appears.
  2. This will open a command prompt window (black window, white text). At the prompt type "ipconfig" and press the "Enter" key.
  3. The Windows IP Configuration will be displayed. You are looking for a heading like "Ethernet adapter Local Area Connection:" and under that heading you are looking for an entry labeled "IPv4 Address" which is in the format of ###.###.###.### (e.g., 128.118.15.126) This is your computer's IP address.

Mac

  1. In the "Applications" folder, open the "Utilities" folder, and launch the "Terminal" or "Terminal.app" application.
  2. This will open a terminal window (white window, black text). At the prompt type "ifconfig" and press the "Enter" key.
  3. In the resulting output, look for a line that starts with en0: or en1:. The IP address of your computer will be listed as part of that line and prefixed with "inet". The IP address is in the format of ###.###.###.### (e.g., 128.118.15.126).

Linux

  1. Open a terminal window.
  2. At the prompt type "ifconfig" and press the "Enter" key.
  3. In the resulting output, look for a line that starts with eth0 or eth1. The IP address of your computer will be listed as part of that line and prefixed with "inet addr:". The IP address is in the format of ###.###.###.### (e.g., 128.118.15.126).
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