IP addresses (article) | The Internet | Khan Academy
https://www.khanacademy.org/computing/computers-and-internet/xcae6f4a7ff015e7d:the-internet/xcae6f4a7ff015e7d:addressing-the-internet/a/ip-v4-v6-addresses
WEBOverall, that's 2 32 possible values: 4,294,967,296 possible IPv4 addresses. That's a lot! But remember, in the beginning, we said there are more than four billion devices connected to the Internet? Well, we're reaching the limit of possible IP addresses. It's time for plan B. IP v6 addresses.
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