Subnetting Cheat Sheet | Download | Use Online ⋆ IpCisco
CIDR Subnet Mask Cheat Sheet | NetworkProGuide
Guide to Subnet Mask (Subnetting) & IP Subnet Calculator
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