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Every computer, modem, server and smart phone that connects to the Internet has a unique Internet protocol (IP) address, so users can find it.

Every computer, modem, server and smartphone that connects to the Internet has a unique Internet protocol (IP) address, which enables users to find it. The address format, known as IPv4, was standardized in 1977 as a 32-digit binary number, making a then seemingly unlimited 4.3 billion addresses (232) available. Now they’re almost gone