The addresses in range 172.16.0.0 through 172.31.255.255, 10.0.0.0 through 10.255.255.255 and 192.168.0.0 through 192.168.255.255 are all considered private, based on RFC 1918. Use of these addresses on the Internet is prohibited so that they can be used simultaneously in different administrative domains with out concern for conflict. Some experts in the industry believe these address are not routable, which is not true.
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