Essential for operation and maintenance: 20 common service ports and their corresponding service information

In the operation and maintenance process, it is crucial to understand the commonly used ports and their corresponding services. Ports are interfaces for communication between computers and networks, while services are applications that run on specific ports. This article introduces 20 ports that are often used in operation and maintenance work and their corresponding services to help you better manage and maintain the system.

List of common ports and services

(1) Port number: 21

Service Name: FTP

Service Description: File Transfer Protocol, used to transfer files between client and server.

(2) Port number: 22

Service Name: SSH

Service Description: Secure Shell Protocol, used to securely log in and execute commands remotely in the network.

(3) Port number: 23

Service Name: Telnet

Service Description: Used to remotely log in to the remote host and execute commands.

(4) Port number: 25

Service Name: SMTP

Service Description: Simple Mail Transfer Protocol, used to send emails.

(5) Port number: 53

Service Name: DNS

Service Description: Domain Name System, used to resolve domain names into their corresponding IP addresses.

(6) Port number: 80

Service Name: HTTP

Service Description: Hypertext Transfer Protocol, used to transfer data between web browsers and web servers.

(7) Port number: 110

Service Name: POP3

Service Description: Post Office Protocol version 3, used to receive email from a mail server.

(8) Port number: 143

Service Name: IMAP

Service Description: Internet Message Access Protocol, used to receive and manage email from a mail server.

(9) Port number: 161

Service Name: SNMP

Service Description: Simple Network Management Protocol, used to manage and monitor network devices.

(10) Port number: 443

Service Name: HTTPS

Service Description: Secure Hypertext Transfer Protocol, protects Web data transmission through encrypted communication.

(11) Port number: 465

Service Name: SMTPS

Service Description: An encrypted version of SMTP used to send email securely.

(12) Port number: 587

Service Name: SMTP

Service Description: Another common port for SMTP, used for sending emails.

(13) Port number: 993

Service Name: IMAPS

Service Description: An encrypted version of IMAP for securely receiving and managing email.

(14) Port number: 995

Service Name: POP3S

Service Description: An encrypted version of POP3 for receiving email securely.

(15) Port number: 1433

Service Name: MSSQL

Service Description: The default port for the Microsoft SQL Server database management system.

(16) Port number: 1521

Service Name: Oracle

Service Description: The default port of the Oracle database management system.

(17) Port number: 3306

Service Name: MySQL

Service Description: The default port of the MySQL database management system.

(18) Port number: 3389

Service Name: RDP

Service Description: Remote Desktop Protocol, used to remotely access and control computers.

(19) Port number: 5432

Service Name: PostgreSQL

Service Description: The default port of the PostgreSQL database management system.

(20) Port number: 8080

Service Name: HTTP

Service Description: An alternative port for HTTP, commonly used in proxy servers and development environments.

My conclusion

It is very important for operation and maintenance personnel to understand the commonly used ports and their corresponding services. By mastering the basic knowledge of these ports and services, you can better diagnose and solve network and system problems. At the same time, the reasonable configuration and management of these services can also improve the security and performance of the system. I hope this article will be helpful for your operation and maintenance work!