Try converting to binary. Start with : since , write and subtract to get . Next check : since , write and subtract to get . The remaining bits are all . Result: . Practice this until you can do it quickly. Converting the other direction works the same way: means . This skill is foundational for subnetting.
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$ curl repovive.com/roadmaps/network-design/ip-addressing-and-subnetting/binary-practice-example
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