About
A free networking toolkit built by a network engineer, for network engineers.
Xavier Mor
Creator & Network Automation Engineer
I built SubnetCalculator.dev because every subnet tool I found was either cluttered with ads, required sign-up, or didn't account for cloud provider quirks like AWS's reserved IPs. This is the tool I wanted when I was designing VPC layouts at 11 PM.
All calculations run entirely in your browser — nothing leaves your machine. The toolkit covers IPv4 and IPv6 subnetting, VLSM, supernetting, wildcard masks, DSCP/QoS, Jinja2 templating, YANG validation, and more.
The toolkit
- → IPv4 Subnet Calculator
- → IPv6 Subnet Calculator
- → VLSM Calculator
- → Supernet Calculator
- → Subnet Overlap Checker
- → Wildcard Mask Calculator
- → IP Converter
- → IP Validator
- → IP Geolocation
- → Bandwidth Calculator
- → DSCP / QoS Converter
- → Jinja2 Template Tester
- → Route Summarization
- → Routing Simulator
- → YANG Module Checker