● MinionsHQ / port-tls
Network · edge

Port & TLS Certificate Checker

Test whether a port is open and, for TLS-speaking services, inspect the certificate — issuer, validity, expiry countdown, SANs, negotiated protocol, and cipher suite. Runs on the global edge; no region selection needed.

Check a host

How it works

MinionsHQ opens a real TCP connection to each port you specify from our edge network — not your browser — so results reflect actual internet reachability rather than a path behind your local firewall or NAT. If a port completes a TLS handshake, we parse the certificate the server presents and surface issuer, subject, validity, SANs, protocol, and cipher.

Private, loopback, and link-local targets are blocked before any connection is attempted. Up to 10 ports per request.

Questions

Frequently asked

Is this free to use?
Yes — like every MinionsHQ tool, it’s free with no signup and no install.
What does the TLS check show?
When a port speaks TLS, you’ll see certificate subject, issuer, validity window, days until expiry, subject alternative names, negotiated TLS version, and cipher suite.
Are private or internal addresses blocked?
Yes. Requests to loopback, private, link-local, and other internal address ranges are blocked before any connection is attempted.
How many ports can I check at once?
Up to 10 ports per request, to keep results fast and the service fair for everyone.