Diagnostic tool

Enter a URL to fetch and diagnose, or paste a JSON blob for local analysis. Results are never stored.

Note: A Cloudflare Worker cannot connect to hosts that are themselves behind Cloudflare (e.g. example.com, cloudflare.com). Those domains report as unreachable. Verified reachable: github.com, wikipedia.org, news.ycombinator.com.
The URL is fetched server-side via the Cloudflare Worker. Privacy policy
Fetching URL and analysing response…