SIMPLE SYSTEMS / ADMIN TOOLS
Certificate checker
Inspect the HTTPS certificate served for a public hostname and check expiry, hostname and TLS verification.
Checks port 443 from this server and inspects the certificate even when invalid. TLS verification is reported separately using the server’s CA trust store. The supplied chain may omit the root, which is normal. This is one endpoint snapshot; browsers, CDNs or other locations may see different certificates. Revocation, certificate transparency and all supported TLS versions are not tested. No private keys or sign-in credentials are needed.