A fast, dark, single-page toolbox for everyday network and dev work - no sign-in, no tracking, runs entirely in the browser.
- Subnet / CIDR - network, broadcast, netmask, wildcard, host range, usable hosts, address type.
- IP / ASN lookup - any IP (or your own): ASN, org, ISP, geo, timezone (keyless ipwho.is).
- Base converter - decimal / hex / binary / octal, synced, BigInt-safe.
- Timestamp - Unix epoch <-> local / UTC / ISO, live clock.
- Base64 / URL - encode + decode (UTF-8 safe).
- JSON - pretty-print, minify, validate.
- Regex - live tester with match highlighting.
- Generators - UUID v4, strong passwords, random hex (Web Crypto).
Everything is client-side except the IP lookup, which calls the keyless CORS-open ipwho.is API directly.
Static site -> Cloudflare Pages project net-toolbox via GitHub Action on push to master
(secrets CLOUDFLARE_API_TOKEN + CLOUDFLARE_ACCOUNT_ID).