Open Port Checker

Open Port Checker: what it is for

Enter your IP (or use the Use my IP button) or a server and choose up to 10 ports to test: SSH, RDP, HTTP, HTTPS, FTP, MySQL, PostgreSQL, MongoDB, Minecraft, cameras and DVRs and others. The test runs from a cloud server, as if someone outside were trying to connect, and shows whether each port is open, closed or filtered, with the connection time.

Useful for checking router port forwarding.

How to use

1. Enter the IP or domain, or use your own IP.
2. Pick the ports or type the numbers.
3. Tap Test ports.

When to use it

• Check port forwarding for a camera or DVR.
• Test whether your Minecraft server is reachable.
• Check whether a database was exposed to the internet.

Frequently asked questions

What is a port test for?

To know whether a service is reachable from outside your network: a security camera, a Minecraft server, remote access (RDP or SSH) or a site hosted at home. If the port shows closed, the router, the firewall or the provider is blocking it.

The port shows closed but I forwarded it on the router. Why?

The most common causes: the program isn't running or listening on that port, the computer's firewall is blocking it, the forwarding points to the wrong local IP, or the provider uses CGNAT and your router has no public IP of its own.

Why can't port 25 be tested?

Port 25 is used for email between servers, and cloud providers block connections on it to prevent spam. To test a mail server, use ports 587 or 465.

Is leaving ports open dangerous?

Each open port is a way in. Only keep open the ones you use, keep the program updated and use strong passwords. Databases like MySQL and MongoDB should never be open to the internet.

Is it really free?

Yes, 100% free. No sign-up, no subscription and no usage limits. All Tools123 are free.

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