How to find subnet magic number6/14/2023 ![]() Since this is to help you answer questions fast, you should already have a basic understanding in subnetting. What is the subnet magic number? What is it, really? It makes subnetting quick and easy to figure out in seconds. The result was to make classful networks more manageable and efficient, by creating subnets and reducing the number of host addresses per subnet to what is actually required. This need was met progressively through the conceptions of subnet masks, variable-length subnet masks (VLSM) and classless inter-domain routing (CIDR). That is, to provide a way to limit the number of host addresses per network segment to what is actually needed, regardless of the network class. For these and other reasons, there was a need to improve the efficiency of IP addressing. Why subnetting? Thanks to subnetting, networks no longer need to be divided solely on the basis of class because it became very apparent that class A and B networks were simply too large - 254 (2^8 - 2) hosts on one network segment is manageable, but 65534 (2^16 - 2) hosts or more on a single network segment is difficult to manage. This divides a network into smaller subnets. ![]() In other words, subnetting involves starting with a default (A, B, or C) network, “stealing” bits from the host portion, and adding them to the network side. The practice of dividing a network into two or more networks is called subnetting. A subnetwork or subnet is a logical subdivision of an IP network.
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