Common Server Ports

Last updated: 2019-11-05 12:15:16
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The following describes the common server ports. For more information about service application ports for Windows, see the official Microsoft document (Windows Service Overview and Network Port Requirements).

Port number Service Description
21 FTP An open FTP server port for uploading and downloading.
22 SSH Port 22 is the SSH port. It is used to remotely connect to Linux system servers in CLI mode.
25 SMTP SMTP server's open port for sending emails.
80 HTTP This port is used for web services such as IIS, Apache, and Nginx to provide external access.
110 POP3 Port 110 is open for the POP3 (email protocol 3) service.
137, 138, 139 NetBIOS protocol Ports 137 and 138 are UDP ports for transferring files via My Network Places.
Port 139: Connections over port 139 attempt to access the NetBIOS/SMB service. This protocol is used for file and printer sharing on Windows and SAMBA.
143 IMAP Port 143 is mainly used for Internet Message Access Protocol (IMAP) v2, a protocol for receiving emails akin to POP3.
443 HTTPS Web browsing port. This is another type of HTTP that provides encryption and transmission over secure ports.
1433 SQL Server Port 1433 is the default port for SQL Server. The SQL Server service uses two ports: TCP-1433 and UDP-1434. Port 1433 is used for SQL Server to provide external services, while port 1434 is used to respond the requester that which TCP/IP port is being used by SQL Server.
3306 MySQL Port 3306, the default port for MySQL databases, is used by MySQL to provide external services.
3389 Windows Server Remote Desktop Services Port 3389 is the service port for remote desktop on Windows 2000/2003 Server, through which you can connect to a remote server by using the Remote Desktop connection tool.
8080 Proxy port Similar to port 80, port 8080 is used for the WWW proxy service for web browsing. Port number ":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.