How to divide IPv4 subnets? What are the categories of IPv4 addresses?

The network number and subnet mask corresponding to this address are respectively.

Network ID: Subnet Mask: 1111 1111 1111 1111 1111 1111 0000 0000

The network is divided into 4 subnets, and the new subnet mask is to add 2 bits (4=2 to the 2nd power) on the basis of the original subnet mask;

The new subnet mask is: 1111 1111 1111 1111 1111 1111 1100 0000

Bitwise and arithmetic the address range with the new subnet mask yields four network addresses.

Corresponding host address range.

Corresponding host address range.

Corresponding host address range.

Corresponding host address range.

Because the last 6 bits of the subnet mask are 0, and the result of the operation is definitely 0, so in fact, only the new two bits can be used*

IP subnetting: The process of designing a subnet mask.

It consists of a 1-byte network ID and a 3-byte host ID, and the highest bit of the network ID must be "0". The range of Class A IP addresses is: There are a total of 27-2 available Class A networks, i.e., 126. <

Demo model: Huawei MateBook X System version: Win10 IPv4 addresses are divided into Class A addresses, Class B addresses, Class C addresses, Class D addresses, and Class E addresses.

There are a total of 27-2 available Class A networks, or 126; Each network has 224-2 available IP addresses, i.e., 1677214.

With a Class B network, there are 214-2, or 16,384, and each network has 216-2, or 6,5534 available IP addresses.

It consists of a 3-byte network number and a 1-byte host number, and the highest digit of the network number must be 110. The range of Class C IP addresses is 28-2, or 254, available in each Class C network.

4. Class D address: Class D IP address is not divided into network number and host number, it is fixed to start with "110, and the value range is:. Class D IP addresses do not point to a specific network, and are currently used in multicast communications.

In order to facilitate the management of IP addresses, IPv4 addresses can be divided into the following five categories based on the first byte of IPv4 addresses.

Class A: 0 127.

Class B: 128 191.

Category C: 192 223.

Category E: 240 254, reserved for use as a research test.

1. Class A IP address.

A Class A IP address is one in which the first of the four segments of an IP address is the network number and the remaining three segments are the local computer number. The length of the network identity in the Class A IP address is 8 bits, the length of the host ID is 24 bits, and the number of Class A network addresses is small, with 126 networks, and each network can accommodate more than 16 million hosts.

Class A IP addresses range to.

2. Class B IP address.

A Class B IP address is one in which the first two segments of the four segments of the IP address are network numbers. The length of the network identity in the Class B IP address is 16 bits, and the length of the host ID is 16 bits, and the Class B network address is suitable for medium-sized networks, with 16,384 networks, and the number of computers that can be accommodated in each network is more than 60,000.

Class B IP address address range.

3. Class C IP address.

A Class C IP address refers to a four-segment IP address in which the first three segments are network numbers and the remaining segments are local computer numbers. In the Class C IP address, the length of the network identity is 24 bits, the length of the host ID is 8 bits, and the number of Class C network addresses is relatively large, with more than 2.09 million networks. Suitable for small-scale LANs with a maximum of 254 computers per network.

Class C IP address range.

4. Class D IP address.

Historically, Class D IP addresses have been called multicast addresses, i.e., multicast addresses. In Ethernet, a multicast address names a set of sites that should be received by an application in that network. The highest bit of a multicast address must be "1110", ranging from to.

5. Class E IP address.

Class E IP addresses start with "11110", and Class E IP addresses are reserved for future and experimental use.

Initially, an IP address is split into two parts: the net identifier in the high-level byte of the address and the host identifier in the rest. To overcome this limitation, the high-digit byte of an address was redefined as a class of the network in the classification networks that followed, and this system defined five classes:

a, b, c, d and e.

Class A: Starts with 1.

Category B: Starts with 11.

Class C: Starts with 111.

Class D: Starts with 1111.

Class E: 11111.

The network number and subnet mask corresponding to this address are respectively.

Network ID: Subnet Mask: 1111 1111 1111 1111 1111 1111 0000 0000

The network is divided into 4 subnets, and the new subnet mask is to add 2 bits (4=2 to the 2nd power) on the basis of the original subnet mask;

The new subnet mask is: 1111 1111 1111 1111 1111 1111 1100 0000

The address range Fengzhen and the new subnet mask are bitwise and arithmetic to obtain four network addresses.

Corresponding host address range.

Corresponding host address cryptic plexus range.

Corresponding host address range.

Corresponds to the address range of the main stove cherry machine.

Because the last 6 bits of the subnet mask are 0, and the result of the operation is definitely 0, so in fact, only the new two bits can be used*

There are five main categories of IPv4 address classification, which are Class A addresses, Class B addresses, Class C addresses, Class D addresses and Class E addresses, Class A is reserved for ** institutions, Class B is allocated to medium-sized companies, Class C is allocated to anyone who needs it, Class D is used for multicast, Class E is used for experiments, and the number of addresses that can be accommodated for each type is also different.

In addition, the five categories of IPv4 addresses are also very different in terms of characteristics, for example, the characteristics of the three types of IP addresses are that when the IP address is written in binary form, the first digit of the Class A address is always 0, the first two digits of the Class B address are always 10, and the first three digits of the Class C geochain site are always 110.

In general, IP is the basic communication protocol, and IP is an important part of the network in the OSI Layer 7 protocol, and it is also the foundation of the modern Internet. IPv4 is the fourth version of the IP protocol, and IPv6 is the sixth version of the IP protocol. The IPv4 version of the IP address is composed of 4 numbers (that is, a 32-bit binary address), and IPv6 is the sixth version of the IP protocol, and the address is 128 bits long, so IPv6 has more addresses, which can basically meet the public IP requirements of any device to go online.