10 Best Subnet Calculators: Subnetting Tutorial, Explained for Everyone
VLSM / CIDR Subnet Calculator APK for Android Download
IP Subnet Calculator – Subnet Mask Calculator | SolarWinds
Subnet Calculator | Free Source Code Projects and Tutorials
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
Tool to help you plan subnets in networks - DEV Community