Is your port really open from the outside?

We connect to your target from our scanning server. This is exactly what anyone on the internet sees.

This request comes from 216.73.216.224.

The most commonly asked-about ports. Test your own IP with one click.

Separate with commas. Up to 24 ports per scan.

How does the test work?

A port test simply tries to open a connection to the given port from outside. If the connection succeeds the port is open, if it is refused it is closed, and if no answer arrives at all it is considered filtered.

UDP is a connectionless protocol; silence can mean either open or filtered, so the result is shown as Open or filtered. For well-known services we send protocol-specific probe packets.

An open port is not dangerous by itself; the danger is an unnecessary or outdated service listening on it. We show warnings for remote desktop, database and file sharing ports.

Frequently asked questions

I forwarded the port but it still shows as closed.

Check these in order: does the forwarding rule point to your device's current local IP, does the device's own firewall allow the port, is the service actually running, and most importantly is your connection behind carrier-grade NAT (CGNAT). With CGNAT, router forwarding cannot work; you need a real public IP from your provider.

Port 25 always shows as closed.

Outgoing SMTP traffic is blocked by most home and cloud providers because of spam. Use port 587 or 465 for sending e-mail.

Can I scan someone else's IP address?

This tool only tries a handful of well-known service ports one by one and applies an hourly quota. It is designed for verifying your own server and your own connection. Scanning systems you are not authorised to test is illegal in many countries; private and reserved IP ranges are blocked entirely.

Are the results stored?

Scan records are kept for statistics and abuse prevention. The result page does not create a public link; nobody else can see your scan.