There are several address formats in computer networks

There are 5 address formats in computer networks, which are: 1. The network identifier of a class A address is represented by the first group of 8-bit binary numbers; 2. The network identifier of a class B address is represented by the first two groups of 8-bit numbers. Represented by binary numbers; 3. The network identification of Class C addresses is represented by the first three groups of 8-bit binary numbers; 4. Class D is used for multicast; 5. Class E is reserved.

There are 5 address formats in computer networks, namely:

In order to facilitate addressing and hierarchical When constructing a network, IP addresses are divided into five categories: A, B, C, D, and E.

Only three categories, A, B, and C, are used in commercial applications.

1. Class A address: The network identifier of a Class A address is represented by the first group of 8-bit binary numbers.

The host identifier in the network occupies 3 groups of 8-bit numbers. Binary number,

The characteristic of Class A address is that the value of the first binary digit of the network identifier must be "0".

It is not difficult to calculate that Class A addresses allow 126 network segments, and each network allows approximately 16.7 million hosts. They are usually allocated to networks with a large number of hosts (such as backbone networks) ).

2. Class B address: The network identifier of the Class B address is represented by the first two sets of 8-bit binary numbers.

The host identifier in the network occupies two sets of 8-bit numbers. Binary number,

The characteristic of Class B address is that the value of the first two binary numbers of the network identifier must be "10".

Class B addresses allow 16384 network segments, and each network allows 65533 hosts. It is suitable for networks with many nodes

(such as regional networks).

3. Class C address: The network identifier of the Class C address is represented by the first three groups of 8-bit binary numbers.

The host identifier in the network occupies one group of 8-bit binary numbers. Number,

The characteristic of Class C address is that the value of the first three binary digits of the network identifier must be "110".

A network with a Class C address allows 254 hosts, which is suitable for networks with relatively few nodes (such as campus networks).

4, Class D

224.0.0.0 to 239.255.255.255

is used for multicast broadcast

5 , Class E

240.0.0.0 to 255.255.255.254 are reserved

among which 255.255.255.255 is used for broadcast

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