What is


Quick Answer

The number sequence refers to the Internet Protocol (IP) address used to designate a computer as a local host. Otherwise known as a "loopback" address, it bypasses local network hardware.

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Full Answer

Applications can use the IP address to access a local computer through TCP/IP by rerouting calls through the computer's network adapter. Importantly, most systems allow the name localhost to resolve to Many applications use the address to designate the application's local functionality. Changing this value in special settings files would therefore link the application to an external IP address as opposed to the loopback operation designated in this instance by default.

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