PORT_SCANNER
Check open ports on a server (limited by browser security)
⚠️ Browser-based port scanning is very limited due to security restrictions. Only HTTP (80) and HTTPS (443) can be reliably detected. Other ports will show as "filtered" regardless of actual status.
What is a port scanner?
A port scanner checks which network ports are open on a server. Open ports indicate running services that accept connections.
Why are some ports shown as filtered?
Browser-based port scanning has limitations. We can only detect some open ports and cannot determine if they're truly closed or filtered by a firewall.
Is port scanning legal?
Scanning your own systems is fine. Scanning others without permission may be illegal in some jurisdictions. This tool only scans well-known public servers.
What do open ports mean for security?
Open ports aren't inherently bad - they're needed for services. However, unnecessary open ports increase attack surface. Always keep services updated.