Use the Open Port Checker to check if a TCP port is open and accessible from the general Internet.

Open Port Checker

Use the Open Port Checker to check if a TCP port is open and accessible from the general Internet.


E.g. www.google.com, 8.8.8.8, 2a00:1450:4009:807::2004
or

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You can pre-select the port you want to check by appending ?port=123 to the URL. For example:

https://soliddevtools.com/network-tools/open-port-checker?port=9912
https://soliddevtools.com/network-tools/open-port-checker?port=443