Your data stays yours.
Your calculations run within the browser and are not sent to an API.
Subnet planning, address checks and transfer estimates — made simple, quick and private. No account needed.

Four focused tools to answer everyday network questions, instantly and privately.
Find network boundaries, usable hosts and the binary address layout.
Enter required hosts to get aligned, non-overlapping IPv4 subnets.
| Segment name | Hosts | Allocated subnet | Network address | Broadcast |
|---|
See whether two IPv4 blocks match, intersect or contain one another.
Estimate backup and file-transfer times using link speed and efficiency.
A focused workspace for the decisions that keep your infrastructure running.
Your calculations run within the browser and are not sent to an API.
No sign-in, setup, or unnecessary steps between you and the result.
Copy network results or export an address plan to CSV.

An independent set of privacy-minded tools for developers, IT teams and curious minds.
Planning results are aids: always verify settings before applying them to a live network.