Domestic Tools

Use the port scanner from 站长工具 (Zhanzhang Tool). Enter the IP address or domain name and port, then click “Start Scan”.

If it shows “Closed”, the port is not open or cannot be connected.

Tool Link: Port Scan – 站长工具

Foreign Tools

Use yougetsignal’s Port Forwarding Tester for scanning.

Upon entering, it will automatically fill in your IP and port 80. You can change it to the desired IP and port, then click “Check”.

If a red flag appears and displays port ** is closed on ***.***.***.***, the port is not open or cannot be connected.

Tool Link: Open Port Check Tool – Test Port Forwarding on Your Router