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Server Common Port

Last updated: 2021-12-13 18:24:48

This document describes common server ports. For more information on service application ports for Windows, see Service Overview and Network Port Requirements for Windows.

Port Service Description
21 FTP An open FTP server port for uploading and downloading.
22 SSH An SSH port for remotely connecting to Linux servers in CLI mode.
25 SMTP An open SMTP server port for sending emails.
80 HTTP A port for web services, such as IIS, Apache, and Nginx, to provide external access.
110 POP3 A port 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 established through port 139 attempt to access the NetBIOS/SMB service. This protocol is used for file and printer sharing on Windows and SAMBA.
143 IMAP A port for Internet Message Access Protocol (IMAP) v2, which is a protocol for receiving emails like POP3.
443 HTTPS A port for web browsing. HTTPS is a variant of HTTP that provides encryption and transmission over secure ports.
1433 SQL Server Default port for SQL Server. The SQL Server service uses two ports: TCP-1433 and UDP-1434. Port 1433 is used to provide external services, and port 1434 is used to return a response to the requester to indicate the TCP/IP port used by SQL Server.
3306 MySQL Default port for MySQL databases, which is used by MySQL to provide external services.
3389 Windows Server Remote Desktop Services Service port for the Windows Server remote desktop, 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 in the WWW proxy service for web browsing. The port number ":8080" is often appended to the URL when you visit a website or use a proxy. In addition, after the Apache Tomcat web server is installed, its default service port is port 8080.
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