RFC 1918

This RFC defines the IPv4 address space that would be used for internal and often private networks. RFC 1918 IP addresses are non-routable IP addresses on the internet. The Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of the IP address space for private internets:

10.0.0.0 – 10.255.255.255 (10/8 prefix)

172.16.0.0 – 172.31.255.255 (172.16/12 prefix)

192.168.0.0 – 192.168.255.255 (192.168/16 prefix)

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