Website diagnostic tools
Choose a tool to check SSL, DNS, HTTP headers, redirects and website indexing.
HTTP/2 / HTTP/3 checker
Test actual HTTP/2 and HTTP/3 connections to your HTTPS URL.
WHOIS / RDAP lookup
Look up public domain registration data, registrar, dates and nameservers.
Ping test
Measure ICMP replies from a public host with a bounded four-packet test.
Traceroute
Inspect a bounded network route to a public host.
SSL / TLS checker
Check certificate trust, hostname coverage and expiry before visitors encounter a warning.
Gzip & Brotli checker
See the actual content encoding and response sizes for identity, Gzip and Brotli requests.
Redirect checker
Follow HTTP redirects, inspect status codes and identify loops or unnecessary hops.
HTTP headers checker
Inspect the headers returned by your website, including caching and content type.
Security headers checker
Review browser security headers and understand what each policy is intended to protect.
DNS lookup
Look up A, AAAA, MX, NS, TXT and CAA records with clear, readable output.
Website availability checker
Check HTTP connectivity and response timing, with an optional comparison from a remote server.
Mail DNS
Inspect SPF, DMARC and the DKIM record for a supplied selector at the submitted hostname.
Email test
Send an email to a temporary address. Check SPF, DKIM, DMARC, the sending server and message structure.
DNSSEC
Observe whether the selected DNS resolver confirms DNSSEC validation.
robots.txt
Read robots.txt and simulate Googlebot and Bingbot rules for the exact submitted URL.
Sitemap
Fetch one sitemap XML document and inspect its type, entry count and sample URLs.
Indexability
Inspect the returned HTML title, description, canonical and indexing directives.
Open Graph
Inspect Open Graph tags that describe the page for link previews.
Cache analysis
Inspect response headers that describe caching and resource validation.
