About NetScope

A free, open-source network security toolkit that runs entirely in your browser. No tracking, no backend.

What It Does

Detects your public IP address, ISP, ASN, and maps your approximate location using free geolocation APIs.

Measures download, upload, ping, and jitter using multi-connection transfers via Cloudflare's global CDN.

Checks emails against XposedOrNot's breach database and passwords against Have I Been Pwned using k-anonymity.

Generates cryptographically secure passwords, PINs, passphrases, and hex keys with one-click presets or custom configuration.

Looks up DNS records and checks SPF, DMARC, DKIM, DNSSEC, and WebRTC leak status for any domain.

All processing happens in your browser. There is no backend server.
Passwords are SHA-1 hashed locally. Only the first 5 characters of the hash are ever transmitted (k-anonymity model).
No analytics, cookies, tracking pixels, or fingerprinting of any kind.
Sign-in is optional. You can use Google, GitHub, or email/password to save results — or skip sign-in entirely as a guest.
If signed in, test results are stored in your private Firebase collection. No one else can see them.
The password generator uses the Web Crypto API (crypto.getRandomValues) for secure randomness.

Pure HTML, CSS, and vanilla JavaScript. No frameworks, no build step, no dependencies beyond a few CDN libraries:

Leaflet + OpenStreetMap — Interactive maps
Firebase — Google, GitHub, and email/password auth + Firestore cloud storage
jsPDF — PDF report generation
ipify / ipapi.co — IP detection and geolocation
Have I Been Pwned — Password breach check (k-anonymity)
XposedOrNot — Email breach lookup
Google DNS-over-HTTPS — DNS record resolution
Cloudflare — Speed test infrastructure

NetScope was inspired by several outstanding tools and services:

DivergeIT Security Scanner — Created by Connor Bescos and Brian Yeo. An inspiration for NetScope's approach to client-side security scanning.
Ookla Speedtest — The gold standard for internet speed testing. Inspired NetScope's multi-connection speed test with animated gauges and jitter measurement.
Have I Been Pwned — Troy Hunt's pioneering breach notification service. NetScope uses HIBP's k-anonymity API for privacy-preserving password breach checks.

NetScope is open source under the MIT License. Contributions, issues, and forks are welcome.