Yesterday I created a new tool, that let’s you check the firewall configuration of your network and other networks for outgoing open ports.
Many public networks do not allow the full port range to be used and figuring out, which ports can be used and which cannot be used, may give you a hard time. This tool allows you to check this directly in your browser.
The host openports.jan.philippi.name listens on all ports for incoming HTTP/s connections and replies on all ports. Clear text HTTP connections will receive a “301 Permanently Moved” HTTP status code. HTTPs connections will receive a “200 OK” status code.
You can find this cool new tool here: https://openports.jan.philippi.name/
- A lot of ports are blocked by your browser. Currently it seems like there is no way around it, but you can use different tools like curl, wget, etc. to check this.