RFC1918 and Link-Local Addresses

RFC1918 (which was originally described in RFC1597) sets aside specific ranges of IP addresses that cannot be used on the Internet. Instead, these addresses are to be used internally within an organization or network. If hosts with RFC1918 addresses want to communicate with a network like the Internet, they must go through some form of NAT because no host on the Internet will know how to route RFC1918 addresses. The addresses assigned by RFC1918 are as follows:

  • 10.0.0.0/8 (netmask 255.0.0.0)

  • 172.16.0.0/12 (netmask 255.240.0.0, which covers 172.16.0.0–172.31.255.255)

  • 192.168.0.0/16 (netmask 255.255.0.0)

NOTE!

In the ...

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