ip - How do you calculate the prefix, network, subnet, and host numbers? - Network Engineering Stack Exchange
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WildPackets IP Subnet Calculator screenshot and download at SnapFiles.com
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Online Subnet Calculator
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Some old Python code for a Network calculator from when I started programming. Not terrible, but every other line reeks of inexperience and lack of foresight. : r/programminghorror
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IP Subnet Calculator Software - Download FREE Today!