Free, browser-based diagnostic and monitoring utilities for developers, DevOps, and webmasters.
Check if any website is up right now from your browser.
Check whether a server is reachable and how fast it responds.
Measure download, upload, ping, and jitter against Cloudflare's edge.
Time a real HTTP request to any public endpoint, with TTFB and total.
Resolve A, AAAA, MX, TXT, NS, and CNAME records via DNS-over-HTTPS.
See your public IP, ISP, ASN, geolocation, and timezone.
Check whether a domain is registered using live RDAP data.
Test APIs, debug DNS, verify endpoints — without leaving the browser.
Quickly validate uptime, monitor latency, and triage incidents.
Confirm your site is live, your DNS resolves, and your domain is healthy.