Paste a hostname. Certscan opens a real TLS connection, reads the certificate the server actually presents, and tells you in plain language: when it expires, who issued it, every hostname it covers, and whether the chain the server sent is complete.
Note: A host behind Cloudflare cannot be reached from this check. Use the live check on any other host.
Most certificate checkers stop at the expiry date. Expiry matters, but the failure that actually costs a weekend is the one nobody looks for: a server that sends only the leaf certificate without its intermediate. Desktop browsers paper over it from cache. Mobile clients refuse to load the page. That problem is invisible to anyone checking only the date.
How many days until the certificate expires, or when it already has. One sentence, no arithmetic.
How many certificates the server actually sent. A leaf alone is a red flag. A full chain with intermediates is green.
Who issued the certificate, and every hostname it covers — Subject Alternative Names listed plainly, not buried in a hex dump.
Serial number, fingerprint, validity window, and every certificate in the chain, available for inspection.
Just the hostname — no scheme, no path. A plain address like github.com.
A server-side TLS handshake reads the certificate chain the way a browser would. There is no cache, no proxy, no local store — the answer is always live.
Expiry date, days remaining, issuer, SANs, chain length. A sentence you can forward to whoever owns the server.
No account, no alerts, no scheduled re-checks. This tool answers when you ask it and forgets immediately. Your hostname is never stored.
A verdict rendered as a lead sentence, with quiet fields beneath it — a lab report you can hand to whoever fixes the server.