Port | Service | Description |
21 | FTP | Port opened by the FTP server. It is for uploading and downloading. |
22 | SSH | Port 22 is the SSH port used to remotely connect Linux system servers via command-line mode. |
25 | SMTP | Port opened by the FTP server. It is for sending mail. |
80 | HTTP | It is used to provide external access for website services such as IIS, Apache, and Nginx. |
110 | POP3 | Port 110 is open for POP3 (mail protocol 3) services. |
137,138,139 | NETBIOS Protocol | Among them, 137 and 138 are UDP ports, which are used when transferring files through the network neighborhood. Port 139: Connections coming through this port attempt to get NetBIOS/SMB services. This protocol is used for Windows file and printer sharing and SAMBA. |
143 | IMAP | Port 143 is mainly used for "Internet Message Access Protocol" v2 (Internet Message Access Protocol, abbreviated as IMAP). Like POP3, it is a protocol for receiving email. |
443 | HTTPS | A web browsing port and another type of HTTP that provides encryption and transmission through secure ports. |
1433 | SQL Server | Port 1433 is the default port of the SQL Server, which uses two ports: TCP-1433 and UDP-1434. Port 1433 is used for SQL Server to provide external services, whereas port 1434 is used to respond to the requester regarding which TCP/IP port is being used by SQL Server. |
3306 | MySQL | Port 3306, the default port of MySQL database, is used for MySQL to provide external services. |
3389 | Windows Server Remote Desktop Services | Port 3389 is the service port for Windows Server Remote Desktop. You can use the Remote Desktop connection tool to connect to remote servers through this port. |
8080 | Proxy Port | Similar to port 80, port 8080 is used for the WWW proxy service for web browsing. The port number extension ":8080" is often appended to the URL when users visit a website or use a proxy server. In addition, after the Apache Tomcat web server is installed, the default service port is port 8080. |
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