The following IP address ranges have been set aside for Internal use. These IP's are will not be routable on the Internet.

Class A:         10.xx.xx.xx
        Addresses:     10.0.0.1    to   10.255.255.254

Class B:         172.16.xx.xx - 172.32.xx.xx
        Addresses:     172.16.0.1     to     172.31.255.254

Class C: 1        92.168.xx.xx
        Addresses:     192.168.0.1     to     192.168.255.254