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  •  Non Routing IP Addresses

  • RFC 1597 defines a group of private IP addresses that will never route
    through the Internet.

    They are:
    10.0.0.0 - 10.255.255.255
    172.16.0.0 - 172.31.255.255
    192.168.0.0 - 192.168.255.255

    Also see RFC 1631 which defines minimum functionality of a Network Address
    Translator device (NAT).