Understanding IP Addresses and Subnet Masks | by Zach Gollwitzer | Medium
Subnet Mask Calculator
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In simplest way possible, describe the 'impact' of shifting an IP subnet mask bit one position to the left (assume the starting mask is 255.255.255.0) what does that change accomplish? - Quora
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What is a Subnet Mask?
Guide to Subnet Mask (Subnetting) & IP Subnet Calculator