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Common Server Ports

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Last updated: 2025-07-22 10:45:09

The following describes the common server ports. For more information on 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 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 through 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 that is similar to POP3.
443
HTTPS
A web browsing port. HTTPS is another type of HTTP that provides encryption and transmission through secure ports.
1433
SQL Server
Port 1433 is the default port for SQL Server. SQL Server uses two ports: port 1433 for TCP and port 1434 for UDP. 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 is the default port for MySQL databases and is used to provide external services.
3389
Windows Server Remote Desktop Services
Port 3389 is the port for remote desktop service 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. 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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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 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 through 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 that is similar to POP3.
443	HTTPS	A web browsing port. HTTPS is another type of HTTP that provides encryption and transmission through secure ports.
1433	SQL Server	Port 1433 is the default port for SQL Server. SQL Server uses two ports: port 1433 for TCP and port 1434 for UDP. 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 is the default port for MySQL databases and is used to provide external services.
3389	Windows Server Remote Desktop Services	Port 3389 is the port for remote desktop service 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. 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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