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Understanding IP Addressing
CIDR FAQ

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IP Subnet/Supernet Calculator

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The IP Subnet/Supernet Calculator is now available for purchase for only US$ 35.00. All purchases require the use of a credit card and are handled through Secure Sockets Layer (SSL) and a secure server at Kagi, our payment processing service. The method of purchase fulfillment is through the download of the program file.

The file to download is an installer program which will guide you through the process of installation. Installer programs are available for the following platforms: Win32, Unix and MacOS. For other operating systems, a pure Java installer is available.

Important: A JavaTM Runtime Environment (JRE) must be installed on your system before the IP Subnet/Supernet Calculator can be used. We recommend that you use JDK1.1.7, but other JDK 1.1 releases might also work. The JRE can be downloaded free of charge from Sun Microsystems

Click on the link below to complete the purchase. After your credit card has been validated, you will receive an email with instructions for downloading.