Calculate, split, visualize and export subnets for AWS, Azure, GCP and on-prem. IPv4, IPv6, VLSM, Terraform — all in one place.
Stop juggling four different calculators. Everything from quick math to Terraform export lives in one place.
Full support for both protocols with visual bit-level breakdowns and instant conversions.
Interactive tree designer to split subnets, merge them back, and design hierarchical layouts.
Cloud-aware reserved IP calculation and validation rules built in for every major provider.
One-click Infrastructure as Code for Terraform, CloudFormation, Bicep, Pulumi and CDK.
Describe what you need in plain English. Get a complete subnet design back in seconds.
Export VPC topology, subnet trees, and bit maps to PNG, SVG, draw.io and Mermaid.
All math runs in your browser. CIDR inputs are not transmitted to our servers.
Permalink any subnet design. Tag with notes, colors and owners. Collaborate with your team.
Track allocations, utilization and conflicts across all your networks in one place.
Free, no signup, no tracking. Just open the calculator and start.
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