About IPCombo

IPCombo is a single-page web app that runs a battery of network probes directly inside your browser — IP echo, WebRTC leak detection, DNS observation, and reachability tests against 45+ popular services. The whole thing is client-side: no proxy hop, no upload, no server-side log of what your network did.

Anyone who runs a proxy, VPN, or split-routing setup and wants to verify, in 5 seconds, whether traffic is exiting where they think it is. The target users are power users in regions where ChatGPT, Netflix, and similar services are region-locked or unstable.

Every probe is a normal browser network call (fetch, WebRTC ICE, or image load). For reachability we hit each service's own cdn-cgi/trace endpoint, which gives us the public IP *as seen by that service* — the most reliable way to detect which exit your traffic actually used. We then run lightweight routing inference to bucket your network as direct / proxy / CDN / smart-routing.

We don't ask for an email, a phone number, or any identifier. We don't run a backend for the diagnostic itself. The optional share link uses a Cloudflare Worker that stores an opaque blob for 30 days, then deletes it — no IP, no fingerprint, no PII.

Next.js 15 on Vercel, with a tiny Cloudflare Worker for the share API and rate-limited IP echo. All probes run in your browser.

The diagnostic engine is closed source in v1.0. We're publishing a read-only public roadmap, and we plan to open-source the routing-inference ruleset and ASN dataset in a follow-up release. The Worker API is unit-tested (53 tests) and the test cases will be released alongside the source.