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Security

SSL/TLS Certificate Checker

Enter a public host and an optional port. One TLS connection is opened, the certificate the server presents is read, and you see the issuer, the names it covers, the protocol, and how many days remain before it expires. Private addresses are refused. The result is not stored.

TLS

Live certificate

Read the certificate from the handshake, including subject, issuer, serial, and the names it covers.

Expiry

See the valid-from and valid-until dates, and whether the certificate is expired or inside 30 days of expiry.

Name and chain

Check that the host name matches, then read the protocol, cipher, and the certificates in the chain.

Input

Enter a public host. One TLS connection reads the certificate the server presents.

Enter a public host. One TLS connection is opened and the certificate the server presents is read. Private addresses are refused, and the result is not stored.