Online Port Scanner

A port scanner is a tool that checks which network ports on a computer or server are open, closed, or filtered. Open ports run services that accept connections — like a web server on port 80 or SSH on port 22. Port scanning helps administrators audit their network security and find services that shouldn't be exposed.

Scanning your own servers and networks is perfectly legal and a standard security practice. Scanning someone else's network without permission may violate computer misuse laws in some jurisdictions. Always scan only IPs you own or have written authorization to test.

An open port means a service is actively listening for connections on that port. For example, an open port 443 means a web server is serving HTTPS traffic. An open port isn't inherently dangerous — but unnecessary open ports increase your attack surface and should be closed or firewalled.

A closed port explicitly rejects connection attempts — the server is reachable but no service is running. A filtered port gives no response at all, usually because a firewall is silently dropping packets. Filtered is generally more secure because attackers can't even confirm the host exists.

Regular port scanning helps you discover services you didn't know were running, verify that firewall rules are working correctly, and detect unauthorized changes. It's a fundamental part of network security hygiene — the same technique penetration testers use.

Yes. When connected to MegaV VPN, your real IP is hidden behind the VPN server's IP. Port scans against your real IP will time out because the traffic never reaches your device. This is one of the simplest ways to protect home servers and IoT devices.