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The primary job of the Internet Protocol (IP) is delivering messages between devices, and like any good delivery service, it can't do its job too well if it doesn't know where the recipients are located. Obviously then, one of the most important functions of IP is addressing. IP addressing is used not only to uniquely identify IP addresses, but also to facilitate the routing of IP datagrams over internetworks. IP addresses are used and referred to extensively in TCP/IP networking.

Even though the original IP addressing scheme was relatively simple, it has become complex over time as changes have been ...

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