Every computer on a computer network has an IP address associated with it. This IP address includes four sets of numbers with a period between each set. The IP address assigned to your computer could be any of a number of combinations, but there is one IP address that is set aside specifically to connect back to your own computer. This is called the loopback address. The loopback address is usually the same for all computer networks.
Click "Start" and type "Run" into the "Search" box. Click "Run."
Type "Ping Loopback."
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Press "Enter." The loopback address will appear on the Ping.exe screen that appears. You must be connected to a network to see the loopback address. of In IPv4, this will almost always be 127.0.0.1.