How to Chart on Subnetting
The multiple digital networks that are the Internet communicate with each other via Internet protocol (IP) addresses. Subnets -- subnetworks -- are divisions of a single IP address. A subnet may represent numerous computers in a single building, geographic location or local area network (LAN). Subnetting allows an organization's network to be divided into smaller networks that are simultaneously connected to the Internet with a single IP.
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Instructions
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Download a free standardized subnet math chart at Happy Router, Ring of Saturn Internetworking or Computer Security Exchange.
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Look at your IP address, count the numbers in octets and add the remaining number to discover the subnet mask, which is a subnetwork that's connected to the initial IP address. For example, if your IP is 192.168.1.23/26, write the final number -- 26, which is the host number -- as a full subnet address using the standardized subnet chart values.
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Refer to the standard subnet binary math chart to discover that 255 equals 8 bits. Write down 255.255.255 equals 24 bits. To achieve the desired 26-bit address, refer to the chart that directs you to bump down two boxes on the subnetting chart to arrive at 192, or two bits. Write the 26 binary bit by recording it as 255.255.255.192.
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Tips & Warnings
Establish your subnets before you assign workstation IP addresses to increase flexibility in segment layout.
Subnetting decreases the total number of IP addresses that is available to you, and you may need to use a router.
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Resources
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