What Is Port Scanning?
Port scanning is the process of checking the availability of network ports on a remote server. Each port is associated with a specific service: port 80 — HTTP, 443 — HTTPS, 22 — SSH, 1080 — SOCKS, 3128 — HTTP proxy, etc. Knowing which ports are open helps determine what services are running on the server.
For proxy work, port scanning helps: verify that the proxy server is actually listening on the specified port, determine proxy type by port number, and check your own proxy server configuration.
How Does Our Scanner Work?
The tool checks up to 20 ports from a preset whitelist (popular web ports, proxy ports, database ports). For each port, a TCP connection attempt is made with a 2-second timeout. Result: "Open" (port is listening) or "Closed" (port is closed or filtered).
Port Presets
Common: 21, 22, 80, 443, 8080, 8443 — basic ports
Proxy: 1080, 3128, 8080, 8888, 9050, 9150 — proxy ports
Web: 80, 443, 8000, 8080, 8443, 3000 — web servers
FAQ
Is this legal? Scanning your own servers and servers you have permission for is legal. We limit the port whitelist to prevent abuse.
Why the 20-port limit? To prevent abuse and reduce load on target servers.