Online Ops Tools
Calculators and generators you reach for every day on the job. All pure frontend — open and use, no data leaves your browser. Every tool links to its tutorial: learn it, then use it.
⚠️ Honest note: real port scanning and SSL certificate lookup need server-side privileges or a public API. These tools generate the correct check command + the troubleshooting path, which you run on your own machine to get the real result. We don't pretend a browser can port-scan for you.
8 pure-frontend tools
| Tool | Value |
|---|---|
| CIDR subnet calculator | Enter a network, get host count / netmask / usable IP range |
| crontab generator | Build cron expressions visually with readable descriptions |
| regex debugger | Live match highlighting + common ops regex presets |
| port check command generator | Generate ss / nc / nmap commands + troubleshooting path |
| SSL cert check command generator | Generate expiry check commands + renewal reminder path |
| timestamp / Base64 / URL encode | High-frequency ops encoding conversions, pure frontend |
| Nginx config check | Generate nginx -t + common error lookup |
| log pattern extractor | Extract / tally patterns from logs, pure frontend |
Why online tools
A tutorial-only site is read and left; a tool stays in the workflow. Calculators and generators are used daily, are convenient, and carry their own search traffic — the most stable second engine for a content site. Tools and tutorials point at each other: hit a problem, read the tutorial; learn it, then compute on the tool page.