Define your network
Start with any IPv4 CIDR range and instantly see available host counts and address boundaries.
CIDR split assistant
Model your subnet hierarchy in seconds
Define the base network, choose one or more split levels and visualise the resulting tree with full address details.
Planner
Prepare your split
Preview
Subnet breakdown
| Mask | Hosts | Actions |
|---|---|---|
| Click "Generate subnets" to start a calculation. | ||
How CIDR Splitter Works
Use the CIDR subnet calculator to plan efficient IP allocations. Enter your base CIDR block, explore the splits, and export the structure your network team needs.
Split with precision
Choose target masks, split subnets in bulk, and visualise how each branch of the hierarchy expands.
Share the plan
Export the CIDR tree to reuse in documentation, change requests, or automation workflows.
CIDR Splitter Features
Focused on network architects, the tool highlights the insights that make CIDR planning faster and more reliable.
Real-time subnet table
Inspect every split with live updates to masks, host counts, and CIDR notations.
Bulk operations
Apply new subnet masks to multiple nodes simultaneously to test alternative capacity plans.
Export-ready outputs
Download structured data that fits easily into change control documentation, CSV imports, or audit reports.