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December 2017

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Visualising Class C Subnets

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I’ve just started learning how to subnet and while there are plenty of resources to help with the calculations and understand the maths I tend to grasp things better if I have some visual representation.

To help, I put together the following table which – I hope – nicely illustrates the patterns of binary 0s and 1s in the 4th octet of a class C IP address and their correlation to the patterns of block sizes, network IDs, host IDs and broadcast addresses of the various subnets. The table is not intended to explain how to calculate subnets nor even to act as a cheat-sheet, but others may find the visual representation helpful.

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