According to TCP/IP protocol, IP address is composed of 32-bit binary numbers, which is unique within the scope of the Internet. For example, the IP address of a computer connected to the Internet is:

1 10 100 10 0 100 100 1 1000 1 100 000000 10

Port number-the identification number of the application software with network function. Note that the port number is not fixed, that is, it can be assigned manually by the user (of course, it is usually defined when writing software). Of course, many applications recognize the default port, such as FTP: 20 and 2 1, http: 80, telnet: 23 and so on.

The Mac address is the address used by the media access layer, and the popular saying is the physical address of the network card. At present, the Mac address is generally 48 bits with 6 bytes (there were 2 bytes of 16bit Mac address in the early days).

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