NetCalc Pro plans IPv4 subnets. You set a parent network, split it into smaller blocks, label each one, and export the plan. Everything runs in your browser — no sign-up, no accounts, no server. Your plan stays on your machine unless you export or share it.
These pages cover how to use each tool: what to type in, which buttons produce what, and which export format fits which handoff. Start with the quickstart if this is your first time.
Sections
- Quickstart ↗
Pick a network, split it, label the subnets, export. Five minutes from blank slate to a plan you can hand off.
- Examples ↗
Full walkthroughs for a home lab, a production AWS VPC, and a multi-VPC hybrid setup. Copy the host counts into the VLSM wizard and you are ready to ship.
- Tool reference ↗
Every tool in the Tools menu — VLSM wizard, supernet calculator, workspace diff + comparison, VPC peering validator, BGP aggregator, bulk label editor. Seven tools, strictly inside subnet planning.
- Exports & imports ↗
JSON, CSV, YAML, Markdown, Terraform HCL for seven clouds, PDF via browser print, plus IPAM paste-import for Infoblox CSV and NetBox YAML.
- Keyboard shortcuts ↗
? opens the full overlay. / jumps to IP search. Esc closes the topmost modal. Ctrl+Z / Ctrl+Y for undo / redo.
What you can do
- Plan VLSM subnet trees by host count.
- Validate overlaps across multiple VPCs or regions.
- Aggregate BGP routes into the shortest covering prefix set.
- Diff and compare plans side-by-side across workspaces.
- Paste Infoblox CSV or NetBox YAML via the top-level Import button to seed a workspace from your IPAM.
- Edit label / VLAN / AZ / notes inline via the subnet table, or in bulk via the Bulk label editor.
- See overlap / labelling / VLAN-conflict findings live in the Radar drawer as you edit.
- Export to Terraform HCL for AWS, Azure, GCP, Oracle, IBM, Huawei, or Alibaba.