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How to check the server port

2025-12-20 13:15:25 science and technology

How to check the server port

In daily server management and network operation and maintenance, querying the server port is a basic and important operation. Whether checking port occupancy or troubleshooting network faults, mastering port query methods can improve work efficiency. This article details how to query a server port and provides structured data for quick reference.

1. Why do you need to query the server port?

How to check the server port

The server port is the entry point for network communication, and each service is usually bound to a specific port. For example, the HTTP service uses port 80 by default, and HTTPS uses port 443. Querying the port can help us:

  • Confirm that the service is running properly
  • Check whether the port is occupied
  • Troubleshoot network connection issues
  • Configure firewall rules

2. Commonly used port query methods

The following are several common methods for querying server ports, applicable to Windows and Linux systems.

operating systemCommands/ToolsDescription
Windowsnetstat -anoList all active network connections and listening ports, and display the corresponding process ID
Windowstelnet [IP] [port]Test whether a certain port is open (Telnet client needs to be enabled first)
Linuxnetstat -tulnDisplay all listening TCP/UDP ports
Linuxss-tulnFunction similar to netstat, but more efficient
Linuxlsof -i :[port]Check the occupancy status of the specified port

3. Detailed operation steps

1. Windows system query port

In Windows systems, you can use the following command to query the port:

  • netstat -ano: List all ports and corresponding process IDs.
  • tasklist | findstr [process ID]: Find specific applications based on process ID.
  • telnet 127.0.0.1 80: Test whether the local port 80 is open.

2. Linux system query port

In Linux systems, commonly used port query commands include:

  • netstat -tuln: Display all TCP/UDP listening ports.
  • ss-tuln: A more modern alternative command with better performance.
  • lsof -i :80: Check the occupancy of port 80.

4. Common port list

Here are some common services and their default ports:

serviceDefault port
HTTP80
HTTPS443
FTP21
SSH22
MySQL3306
Redis6379

5. Summary

Querying server ports is an essential skill for network management and troubleshooting. Whether it is a Windows or Linux system, you can quickly obtain port information through command line tools. Mastering these methods can help us manage servers more efficiently and optimize network configuration.

If you have other questions about server ports, please leave a message in the comment area to discuss!

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