For example, just add "/:204××" to the port number.

The port addresses in TCP and UDP segment structures are 16 bits, and can have port numbers in the range of 0-65535. Services provided by any TCP/IP implementation use port numbers between 1- 1023, which are managed by ICANN. The port number of1024-49151is the registered port number, which is designated as a special service by IANA. From 49 152-65535 are dynamic or dedicated port numbers.

Extended data:

The actual purpose and port number of each port.

1 and 1 serial ports

The POP3 server opens the 102 port to receive mail, and the client accesses the mail service on the server side; News newsgroup transport protocol, carrying USENET communication. The connection of this port is usually that people are looking for a USENET server; 137 and 138 are UDP ports, which are used when transferring files through my online neighbors.

2, 2 serial ports

The FTP server opens port 2 1 for uploading and downloading. The most common attacker is to find a way to open anonymous's FTP server. These servers have read-write directories; The connection between TCP and port 22 established by PcAnywhere may be to find ssh；; The purpose of scanning port 23 is to find the operating system running on the machine.