What the status tiers mean
A browser cannot read the HTTP status of a cross-origin site it is not permitted to read. Anything claiming otherwise is guessing, so this tool reports which method produced each result.
VERIFIED — fetched through your Ghost Worker, which is server-side and sees the real response. The status code shown is the actual one.
REACHABLE — a no-cors browser probe completed. That proves DNS resolved, TLS negotiated and the server answered. It cannot distinguish 200 from 404 or 503, because the response is opaque by design. Treat it as "the host is alive", never as "the page is fine".
NO ANSWER — the probe failed outright: DNS failure, connection refused, timeout, or your own network blocking it. On a corporate network this often says more about the network than the site.
Checks are paced and run only when you ask. Results cache for 12 hours so re-opening the page does not re-probe every host. Nothing here is a substitute for the site's own status page.