private IP address ranges (RFC1918)

These are private IP address range as described in RFC 1918. They are not routed on the internet and they are for private or internal use only.

10.0.0.0 – 10.255.255.255        or 10.0.0.0/8
172.16.0.0 – 172.31.255.255     or 172.16.0.0/12
192.168.0.0 – 192.168.255.255  or 192.168.0.0/16

Source:

ftp://ftp.rfc-editor.org/in-notes/rfc1918.txt

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