Expand your network by supernetting IP addresses
Put simply, supernetting a TCP/IP network address is the opposite of subnetting it. Supernetting is also known as CIDR (classless interdomain routing) as defined by RFCs 1517, 1518, 1519, and 1520. In IPv4, CIDR is one way of attempting to manage the shortage of TCP/IP addresses until IPv6 takes over.
Supernetting in itself does not give you more TCP/IP addresses; however, it provides larger single networks for use. Here’s how to implement supernetting on your network or support a supernetted network that you may have inherited.
http://articles.techrepublic.com.com/5100-6350_11-5034906.html
Internet Protocol (IPv4) Subnet Chart
http://www.pantz.org/software/tcpip/subnetchart.html
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