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) ).

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).

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).

224.0.0.0 to 239.255.255.255

is used for multicast broadcast

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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