We’ve added a new VLSM Subnetting Calculator.
- Variable-length subnetting: Enter the required host count for each department or purpose, and get a subnet sized exactly to fit. Wastes far less address space than splitting everything into equal-sized subnets.
- Optimal auto-placement: Larger requirements are placed first so the block fills with no gaps.
- Usage summary: See used, free, and wasted address counts across the whole block at a glance.
- Copy result: Copy the full allocation as a table with one click.
- All calculations happen entirely in your browser — nothing you enter is sent to or stored on a server.