What are IP Addresses anyway?

• IPv4 address: 32-bit number

  • e.g. 132.234.250.31
  • 4 billion addresses (though much less in practice)

• IPv6 address: 128-bit number

  • 16 billion billion addresses (much less in practice)

• Internet infrastructure addresses

  • Every device must have an IP address
  • Every globally-reachable address is unique

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