elitesystem.net

Free tools / Network

TLS certificate and protocol checker

Resolves the public A and AAAA addresses, connects on port 443, and reports the address used for the handshake, certificate, trust result, hostname match, protocol versions, cipher, ALPN, expiry, key strength, fingerprint, and presented chain.

Only public destinations on TCP port 443 are permitted. Private, loopback, link-local, and reserved addresses are blocked after DNS resolution.