June 16, 2010
IPv4 Private Subnets Defined
TCP/IP is used within corporate and other private networks. Address conflicts with Internet systems is something to be avoided, so non routable IP address ranges are used internally on private networks to prevent this and also for security reasons. An Internet based system cannot directly address one of these IP addresses. The non routable addressed systems are allowed to access the Internet through NAT or a proxy system.
The non routable IP address ranges are:
Class A: 10.0.0.0 – 10.255.255.255
Class B: 172.16.0.0 – 172.31.0.0
Class C: 192.168.0.0 – 192.168.255.255
