Site Diagnostic Tools
Check reachability, DNS, TLS, IPs, RDAP events, headers, page size, technology signals, and links.
Website Down CheckerAttempt a bounded public-web request and report reachability, response status, timing, and final URL.Protected server checkDNS LookupResolve common public DNS record types for a domain using the server resolver.Protected server checkDNS Propagation CheckerCompare A, AAAA, CNAME, MX, NS, or TXT answers across six independent named public recursive resolver operators.Protected server checkSSL CheckerOpen a TLS connection and report authorization, hostname matching, protocol/cipher, certificate subject/issuer, SANs, chain depth, expiry date, and days remaining.Protected server checkIP LookupResolve a hostname to public IPs or inspect an IP address family and reverse-DNS names.Protected server checkDomain Age CheckerQuery authoritative RDAP and report creation age, expiry, days to expiry, last update, registrar information when published, registry status, nameservers, and source events.Protected server checkHTTP Header CheckerFetch a public URL and list response headers from the final bounded response.Protected server checkPage Size CheckerFetch a bounded HTML response and report transferred body bytes, Content-Length when present, and truncation status.Protected server checkCMS / Website Technology CheckerInspect HTML and headers for transparent heuristic signals of common CMS and frontend platforms.Protected server checkBroken Link CheckerCrawl up to five same-origin HTML pages, discover up to 120 unique HTTP links, and test them concurrently with HEAD plus bounded GET fallback.Protected server check