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This article mainly introduces what the network prefix length refers to, the article is very detailed, has a certain reference value, interested friends must read!

The network prefix length network prefix, the IP address part corresponding to the network portion of the address, is used to uniquely identify the network number of a network connected to the Internet, called the network prefix.

1. Network prefix network prefix:

The IP address portion that corresponds to the network portion of the address; for example, the network prefix of a Class B address is / 16 (that is, the first 16 bits represent the network portion of the address, and 255.255.0.0 is the corresponding default subnet mask

The network number used to uniquely identify a network connected to the Internet, called the network prefix.

2. Standard A/B/C address with fixed network prefixes of 8, 16 and 24 bits. The network prefix 20 mentioned in the title is an address segmentation strategy based on the concept of CIDR.

3. CIDR reconstructs the classful routing process that was used to assign class A, class B and class C addresses. CIDR replaces the limitations of the original address structure on the network portion of the address with a prefix of 13-27 bits (the network portion of the three types of addresses is limited to 8 bits, 16 bits and 24 bits, respectively). In the address block that the administrator can assign, the number of hosts ranges from 32 to 500 million, which can better meet the special needs of the organization for addresses.

The CIDR address contains the standard 32-bit IP address and information about the number of network prefix bits. Take the CIDR address 222.80.18.18ax 25 as an example, where "/ 25" indicates that the first 25 bits in the previous address represent the network portion, and the remaining bits represent the host portion.

4. So the network prefix in the topic is 20, that is, a class B address (standard network prefix 16) is subdivided into more subnet segments, and the network prefix increases to 20.

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