FREE ONLINE TOOLFree Subnet
Free Subnet
Calculator
Open Subnet Calculator and complete the task in your browser, free of charge.
FreeUse this tool without paying.No sign upStart with the tool right away.Clear stepsRead the tool’s own guidance.
About Free Subnet Calculator
Calculate IPv4 and IPv6 subnets, dotted and wildcard masks, usable-host semantics, exact address counts, equal splits and VLSM plans. See the bit boundary, size networks from requirements, and export implementation-ready tables.
Workspace options
- CIDR, IPv4 mask, or wildcard
- Dotted value interpretation
- Required usable IPv4 hosts
- Allow /31 for exactly two point-to-point endpoints
- Parent prefix
- Needed subnets
Available actions
- Calculator
- Sizing lab
- VLSM planner
- Equal split
- Guide
- Calculate subnet