Network Tools

Diagnose, test, and explore network-related utilities - measure your internet speed with our speed test, build cron expressions visually, test regular expressions in real-time, parse user agent strings, look up HTTP status codes, and browse well-known port numbers. All tools run locally in your browser with no signup required.

Network Tools

6 tools

Speedtest-Lite (Download/Upload Estimator)

Estimate internet connection speed by downloading a test payload and timing it. Measures download speed (Fetch API + Streams), upload speed (generated payload), and latency (median of HEAD request samples). Visual gauge with progress tracking, speed ratings (Very Fast to Slow), and test history with summary stats. All processing runs locally in your browser - free online Speedtest-Lite, no signup required.

Cron Expression Generator & Explainer

Build cron expressions visually by selecting minute, hour, day, month, and weekday with wildcard, value, range, step, and list modes. See human-readable explanations and next 5 run times. 18 common presets (every hour, daily, weekly, monthly, etc.). Copy to clipboard - all processing runs locally in your browser, no signup required.

Test regular expressions in real-time - enter pattern and test strings, see matches highlighted with capture groups. Supports flags (g, i, m, s, u, y). Quick reference table of common patterns. All local, no data sent anywhere.

User Agent Parser & Decoder

Parse any User-Agent string into browser name, version, rendering engine, operating system, device type (Desktop/Mobile/Tablet/Bot), and architecture. Compare two UA strings side-by-side, detect bots and spoofing attempts, see browser market share context, and get confidence scores. Includes 8 example UAs, recent parsing history, and localStorage persistence - all processing runs in your browser, no signup required.

HTTP Status Code Reference

A complete, searchable reference of all HTTP status codes (1xx-5xx) with descriptions, meanings, and usage notes. Browse over 50 status codes from standard HTTP, WebDAV, and experimental specifications. Search by code or keyword, filter by category (1xx-5xx), and access detailed explanations, practical usage guidance, and RFC sources. Copy any status code with one click. Free online HTTP status code reference - no signup required.

Port Checker (Client-Side Reference)

Browse and search over 200 well-known TCP/UDP port numbers with service names, descriptions, protocols (TCP/UDP/SCTP), and IANA registration status. Filter by category (Web, Email, Database, Gaming, Security, File Transfer, Remote Access). Real-time search by port number or service name. All data bundled - works offline, no signup required.