IPv4

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RFC 1918

  • Address Allocation for Private Internets
10.0.0.0/8 - 10.0.0.0 through 10.255.255.255
172.16.0.0/12 - 172.16.0.0 through 172.31.255.255
192.168.0.0/16 - 192.168.0.0 through 192.168.255.255

RFC 6890 and RFC 3927

  • Link-local addresses
169.254.0.0/16 - 169.254.1.0 through 169.254.254.255

RFC 6598

  • IANA-Reserved IPv4 Prefix for Shared Address Space
  • Dedicated space for Carrier Grade NAT

Shared Address Space is distinct from RFC 1918 private address space because it is intended for use on Service Provider networks.

100.64.0.0/10 - 10.64.0.0 through 10.127.255.255

RFC 2544

  • Addresses starting with "198.18." or "198.19." are set aside for use in isolated laboratory networks used for benchmarking and performance testing. They should never appear on the Internet and if you see Internet traffic using these addresses, they are being used without permission.
198.18.0.0/15 - 192.18.0.0 through 198.19.255.255