What's My IP

Android app for ip.sprytnyk.dev, with the same design as the site. It shows your public IPv4 and IPv6 addresses, country, city and network organisation, runs a DNS leak test that lists the resolvers looking up names for you and flags those outside your network, and can look up any other address.

Privacy

Neither the app nor its backend collects your data.

• No tracking. No analytics, ads, crash reporting or accounts.
• One server. The app only talks to ip.sprytnyk.dev and its ipv4./ipv6. subdomains, and the DNS leak test looks up random names under its dns. subdomain, which the backend's own nameserver answers. Footer links open in a browser only when you tap them.
• Local GeoIP. The backend answers from local MaxMind GeoLite2 databases, so your address is never passed on to a third-party lookup service.
• History stays on your phone. Recent lookups are stored on the device only, and you can clear them at any time.
• Self-hostable. The backend is open source. Point the app at your own instance by changing API_HOST in src/lib/api.ts.

Develop

npm install        # also installs the git hooks (husky)
npx expo start     # scan the QR code with Expo Go on Android

Checks

npm run lint       # ESLint (eslint-config-expo) + Prettier
npm run typecheck  # tsc --noEmit
npm run format     # Prettier --write

The pre-commit hook runs lint-staged: eslint --fix and Prettier on staged files, then a project-wide tsc --noEmit.