Useful answers.
Visible workings.
Browser tools for network and platform engineers, built around precise results you can inspect.
The problem
A quick network calculation still needs a dependable answer. Boundaries, address counts, and assumptions should be visible enough to check before using the result.
Systrex turns those routine questions into focused tools for subnets, DNS, certificates, and other engineering tasks.
What I built
The subnet workbench handles IPv4 and IPv6, from a single prefix to address ranges, set operations, and allocation plans. Results include exact boundaries and an explicit address policy.
For example, the built-in input 192.0.2.130/26 resolves to the following block:
| Network | 192.0.2.128/26 |
|---|---|
| Final address | 192.0.2.191 |
| Total address slots | 64 |
Keep the calculation
in the browser
The subnet workbench runs locally in the browser. Its inputs are not stored or sent to a server, and results can be copied or exported when you choose.
It makes a useful boundary for the tool: calculate the address space and explain the result, with no need to upload the input.