Shulou(Shulou.com)06/01 Report--

Well-known ports are also known as commonly used ports, and the port number is 0-1023. They are closely tied to some special services and can no longer redefine their objects. So the remote Desktop connection can change the port number. Port 23 is dedicated to telnet service, port 25 is for smtp (mail) service, and port 135is for rpc (remote invocation service). These ports are usually not called by * programs.

Registered port, port number is 1024-49151, they are loosely bound with some services, these ports do not have clearly defined objects, different programs can define their own needs, these ports are very useful in the protection and killing of * * programs.

Dynamic and / or private ports, 49152-65535, common services will not theoretically be assigned to these ports. Changyu likes to use these ports very much and will not attract attention.

The above is divided by port number.

The following is divided by protocol type, divided into "tcp port" and "udp port", generally directly connected to the receiver using the tcp protocol. The udp protocol is used to just publish the information on the Internet without paying attention to whether it reaches the receiver.

Common ports using the tcp protocol:

1.ftp protocol port

2.telnet protocol port. The utility model relates to a port for remote login, through which users can log in remotely to the computer according to their own identity, through which a communication service based on dos mode can be provided. For example, a bbs server that supports a character-only interface will open port 23 to provide services.

3.smtp protocol port

4.pop3 protocol port: pop3 protocol is used to receive mail, usually using port 110. as long as there is a corresponding program that uses pop3 protocol, it can receive mail. For example, 126 website enters the mailbox.

Common ports using the udp protocol:

1.http protocol port

2.dns protocol port, port 53

3.snmp Port: simple Network Management Protocol, which is used to manage network devices.

4.qq protocol port. Using udp protocol, the qq server listens on port 8000 and the client on port 4000.

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