The formula for usable hosts is , where is the number of host bits. You subtract for network and broadcast addresses. For a , you have host bits. usable hosts. For a , you have host bits. usable hosts. If you need hosts, a with usable addresses works. A with doesn't.
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$ curl repovive.com/roadmaps/network-design/ip-addressing-and-subnetting/calculating-usable-hosts
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