Watch https://www.youtube.com/watch?v=7_-qWlvQQtY
Questions:
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What are IP addresses for?
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What has been done to prevent running out of IP addresses?
Optional: Check out IPv6: https://www.fcc.gov/guides/internet-protocol-version-6-ipv6-consumers, then test your IPv6 connectivity at http://test-ipv6.com/