Find out what the internet can see of your machine.
Free Security, Privacy and Network Tools
Start with the firewall test. It checks which ports on your internet connection answer from the outside. It runs from our server against the address your connection is using right now, so what you see is roughly what anyone else on the internet would see.
Scan any port or range up to 1,024, or run a quick check of ten common ports. Each port comes back with one of four answers, answered, refused, no reply or could not test, and the page explains each one in plain words.
Free, with nothing to sign up for. Test your own connection only. At work, at school, in a hotel or on shared wifi, the address belongs to the network.
- 21no reply
- 22refused
- 23no reply
- 80answered
- 135no reply
- 139no reply
- 443answered
- 445refused
- 3389no reply
- 5900no reply
- answered
- refused
- no reply
- could not test
Recheck at the end: 80 and 443 answered again.
Refused and no reply are both ordinary, and neither one leaves anything listening. An answering port is not automatically a problem. It becomes one when you did not mean to open it.
This is an example. Run the test to see your own connection.