SSL/TLS Checker

Inspect the TLS protocol version and cipher suite a website negotiates — distinct from the certificate itself.

About this tool

A website's certificate and its TLS configuration are two different things — a perfectly valid certificate can still be served over an outdated, weaker TLS protocol version. This tool inspects specifically the protocol and cipher negotiated for the connection, not the certificate's own validity (see SSL Checker for that).

What counts as modern here

TLS 1.2 and TLS 1.3 are the current, secure protocol versions in wide use today. Older versions (TLS 1.0, TLS 1.1, and SSL 3.0/2.0) have known weaknesses and are deprecated across major browsers — a server that only offers those to this checker would be a meaningful finding.

Related tools:

SSL Checker SSL Certificate Checker Website Security Checker