Free browser tool
Run SSL Certificate Checker
Ready for resultsEnter a hostname and run the check.
Website Tools
SSL Certificate Checker
Check whether a hostname is reachable over trusted HTTPS from your browser and review DNS signals that affect certificate issuance.
HTTPS ReachabilityDNS CAA CheckNo Registration Required
What this browser check can confirm
If the HTTPS connection succeeds, the browser was able to reach the hostname over HTTPS and did not reject the certificate before the connection completed. This is a useful quick signal for hostname trust, DNS routing, server availability, and certificate acceptance from your current network.
What still needs deeper review
Browser JavaScript cannot read the full certificate issuer, serial number, validity dates, or intermediate chain. For production decisions, confirm those details in your hosting dashboard, CDN dashboard, certificate authority account, or a server-side TLS tool.
Common causes of failure
HTTPS can fail because the hostname does not resolve, port 443 is closed, the server presents the wrong certificate, the certificate expired, the chain is incomplete, a CDN edge has stale configuration, or a firewall blocks the connection.