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This article will explain in detail how to classify IP addresses for everyone. Xiaobian thinks it is quite practical, so share it with you for reference. I hope you can gain something after reading this article.

An IP address consists of two parts, a network address and a host address; the network address indicates which network it belongs to, and the host address indicates which host it belongs to; the two are master-slave relationships.

An IP address consists of four segments, each field is one byte, 8 bits, and the maximum value is 255.

An IP address consists of two parts: the network address and the host address. The network address indicates which network of the Internet it belongs to, and the host address indicates which host in that network it belongs to. The two have a master-slave relationship.

The four types of IP addresses identify a host on the network. IPv4 addresses are 32 bits in length and 4 bytes in total, but in practice we use dotted decimal notation.

IP addresses are divided into A, B, C and special addresses D and E according to the network number and host number. All zeros and all ones are left unused.

Class A: (1.0.0.0-126.0.0.0)(Default subnet mask: 255.0.0.0 or 0xFF00000) The first byte is the network number and the last three bytes are the host number. The prefix of this type of IP address is "0", so the network number of the address is between 1 and 126. Usually used in large networks.

Class B: (128.0.0.0-191.255.0.0)(Default subnet mask: 255.255.0.0 or 0xFFFF0000) The first two bytes are the network number and the last two bytes are the host number. The prefix of this IP address is "10", so the network number of the address is between 128 and 191. Usually used in medium-sized networks.

Class C: (192.0.0.0-223.255.255.0)(subnet mask: 255.255.0 or 0xFFFF00) The first three bytes are the network number and the last byte is the host number. The prefix of this IP address is "110", so the network number of the address is between 192 and 223. Usually used for small networks.

Class D: is a multicast address. The prefix of this IP address is "1110", so the network number of the address is between 224 and 239. Generally used for multicast users [1].

Class E: reserved address. The prefix of this IP address is "1111", so the network number of the address is between 240 and 255.

Of the three main types of IP addresses, three areas are reserved as private addresses, and the address ranges are as follows:

Class A addresses: 10.0.0.0~10.255.255.255

Class B addresses: 172.16.0.0~172.31.255.255

Class C addresses: 192.168.0.0~192.168.255.255

Return address: 127.0.0.1. Also a native address, equivalent to localhost or native IP. Generally used for testing. For example: ping 127.0.0.1 to test whether TCP/IP is normal.

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