Scan your network for open ports that could be security risks. Check common ports like HTTP (80), HTTPS (443), SSH (22), and more. Free online port checker.
A port scanner checks which network ports on your device or network are open and accepting connections. Open ports can expose services to the internet, creating potential security vulnerabilities if those services are outdated or misconfigured.
Click scan to check common ports on your current IP address. The scanner tests well-known ports including HTTP (80), HTTPS (443), SSH (22), FTP (21), SMTP (25), DNS (53), and others. Results show which ports are open, closed, or filtered.
A port scanner is a tool that probes a server or host for open ports. Ports are virtual endpoints where network connections start and end. Each port is associated with a specific service or protocol.
Scanning your own network is legal. Scanning networks you do not own without permission may violate computer fraud laws in many jurisdictions. Only scan networks you are authorized to test.
Ideally, all ports should be closed unless you specifically need them open. Common ports that should NOT be open on home networks include: 21 (FTP), 23 (Telnet), 445 (SMB), and 3389 (RDP).