TCP Port Checker
Open a real TCP connection from our global edge network to any host and port to confirm whether the service is reachable from the public internet, with connection timing.
About the TCP Port Checker
Open a real TCP connection from our global edge network to any host and port to confirm whether the service is reachable from the public internet, with connection timing.
Queries run from our global edge network, so you see what a neutral observer on the public internet sees — not what your local network or ISP resolver happens to have cached.
Frequently asked questions
What does the TCP Port Checker do?
Open a real TCP connection from our global edge network to any host and port to confirm whether the service is reachable from the public internet, with connection timing.
Is the TCP Port Checker free to use?
Yes. The TCP Port Checker is completely free with no account, no signup and no usage limits for normal use.
Do you log the lookups I run?
No. Queries are processed at the edge and returned straight to you. We do not retain, profile or sell your lookup history.