portscan.io - free online port scanner

Your IP address:


How to use it:

Enter a port and click "Scan"

Don't do this from a network that you don't have permission to scan!

How does it work?

  1. We get your IP address from the connection you make to this server
  2. We try to connect to the TCP port you specify, at your IP.
  3. If we get a response, the port is open.
  4. If we get no response, the port is assumed closed.