Click "Start → Run" in turn, enter "cmd" and press enter to open the command prompt window. Type "netstat -a -n" at the command prompt, and then press Enter to view the port number and status of TCP and UDP connections displayed in digital form.
If you want to open the port, just select Automatic in the startup type, click OK, then open the service, click Start Enable Port in the service status, and finally click OK.
2 1 port: 2 1 port is mainly used for FTP (file transfer protocol) service.
Port 23: Port 23 is mainly used for Telnet (Remote Login) service, which is a login and simulation program widely used on the Internet. Port 25: Port 25 is opened by SMTP (Simple Mail Transfer Protocol) server and is mainly used for sending mail. Now, most mail servers use this protocol.
Port 53: Port 53 is opened by DNS (Domain Name Server) server and is mainly used for domain name resolution. DNS service is the most widely used service in NT system.
Ports 67 and 68: Ports 67 and 68 are open ports for Boot Protocol Server and Boot Protocol Client serving Bootp respectively.
Port 69: TFTP is a simple file transfer protocol developed by Cisco, similar to FTP.
Port 79: Port 79 is open for Finger service, and is mainly used to query the online users of remote hosts, operating system types, whether the buffer overflows and other details.
Port 80: Port 80 is open to HTTP (Hypertext Transfer Protocol), which is the most commonly used protocol for surfing the Internet and is mainly used for transmitting information on WWW (World Wide Web) services.
Port 99: Port 99 is used for a service called Metasyntax Relay (sub-game delay), which is rare and generally not used.
109, 1 10 port: 109 port is open for post office protocol 2 (post office protocol version 2) service, 1 10 port is open for POP3 (mail protocol 3) service, and both POP2 and POP3 are mainly used for receiving.
1 1 1 port: 1 1 port is an open port of SUN's RPC (Remote Procedure Call) service, which is mainly used for internal process communication between different computers in a distributed system. RPC is an important component in various network services.
1 13 port: 1 13 port is mainly used for "authentication service" of Windows.
Port 1 19: Port 1 19 is open for network news transfer protocol (NNTP for short).
Port 135: Port 135 is mainly used to provide DCOM (Distributed Component Object Model) services by using RPC (Remote Procedure Call) protocol.
Port 137: Port 137 is mainly used for "NetBIOS name service".
Port 139: Port 139 is provided for "NetBIOS session service", which is mainly used to provide Windows files and printers * * * and Samba services in Unix.
Port 143: Port 143 is mainly used for Internet Message Access Protocol V2 (IMAP for short).
16 1 port: 16 1 port is used for Simple Network Management Protocol (SNMP).
Port 443: Port 43 is a web browsing port, mainly used for HTTPS service, and is another HTTP that provides encryption and transmission through a secure port.
Port 554: By default, port 554 is used for Real-time Streaming Protocol (RTSP).
Port 1024: In general, port 1024 is not fixed as a service, but is interpreted as "Reserved" in English.
Port 1080: Port 1080 is the port used by Socks proxy service. The WWW service that people usually use on the Internet uses the proxy service of HTTP protocol.
Port 1755: Port 1755 is used for "Microsoft Media Server" (MMS for short) by default.
4000 port: 4000 port is used for QQ chat tools that people often use, specifically, it is the open port of QQ client, and the port used by QQ server is 8000.
Port 5554: On April 30th this year, it was reported that a new worm appeared, worm. Sasser, appear for the lsass service of Microsoft. This virus can use TCP 5554 port to open FTP service, which is mainly used to spread the virus.
Port 5632: Port 5632 is the port opened by the familiar remote control software pcAnywhere.
8080 port: Like 80 port, 8080 port is used for WWW proxy service, which can realize the concept of web port. In network technology,
A port has two meanings:
One is physical ports, such as interfaces used by ADSL modems, hubs, switches and routers to connect other network devices, such as RJ-45 ports and SC ports.
The second is logical port, which generally refers to the port in TCP/IP protocol. Port numbers range from 0 to 65535, such as port 80 for browsing web services, port 2 1 for FTP services and so on.