TCP Port Checker
TCP Port Checker with server-side checks of public network targets and result export.
TCP Port Checker
Specify one public host and up to 20 TCP ports (1–65535). This server attempts connections and distinguishes open, refused, timed-out and unreachable results. A connection does not prove application health; UDP is not tested.
The target and options are sent to this server, which connects to the target. Results reflect the server’s network connection.
Processed content stays in this page’s memory and cannot be recovered after clearing or closing.
About this tool
Specify one public host and up to 20 TCP ports (1–65535). This server attempts connections and distinguishes open, refused, timed-out and unreachable results. A connection does not prove application health; UDP is not tested. The target and options are sent to this server; results reflect its network. Inputs and results are not stored. Metrics only include status, timing, counts and copy/download actions.
How to use
- Enter a public URL or host/IP and choose a method or ports.
- Run the check; cancel at any time. Up to 12 checks per session per minute.
- Review status, validation or individual port results; copy/download JSON. Certificates can also be downloaded as PEM.
Frequently asked questions
Why does this differ from my computer?
Checks originate from this server; DNS, network egress, firewalls and CA stores may differ. Private, loopback and reserved addresses are blocked. A TCP connection does not prove application health, and revocation is not checked.
Discussion & comments
Share your experience and discover more ways to use this tool.
Loading comments…