Introduction to TCP/IP and routing : Introduction to IP : Architecture of IP : Addressing (2)
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1.2.2. Addressing (2)

Some addresses are reserved for private use, and are not routed on the Internet.

RFC 1918 (http://www.pasteur.fr/other/computer/RFC/19xx/1918):

  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)


Introduction to TCP/IP and routing : Introduction to IP : Architecture of IP : Addressing (2)
Previous: Addressing
Next: Netmasks, CIDR, and subnets