Methods of IP address division for computer networks

IP address refers to the Internet Protocol address, which is the abbreviation of IP address, IP address is a unified address format provided by the IP protocol, which assigns a logical address to every network and each host on the Internet, so as to mask the difference in physical addresses.

IP is a protocol for interconnection between networks, that is, a protocol designed for computer networks to connect to each other and communicate, in the Internet, it is a set of rules that can enable all computer networks connected to the network to communicate with each other, and stipulates the rules that computers should abide by when communicating on the Internet. Any computer system produced by any manufacturer can be interconnected with the Internet as long as it adheres to the IP protocol.

An IP address is a 32-bit binary number, usually split into four octal binary numbers, and the IP address is commonly expressed in dot decimal form as ABCD. where abcd is a decimal integer between 0-255.

IP address is a way to address a host on the Internet, also known as a network protocol address, and common IP addresses are divided into two categories: IPv4 and IPv6.

IP address addressing scheme, IP address compilation scheme, divides the IP address space into five classes: A, B, C, D, and E, where A, B, C are the basic classes, and D, and E are used as multicast and retention.

IP V4 is a four-segment number, each with a maximum of 255, due to the vigorous development of the Internet, the demand for IP addresses is increasing, making the issuance of IP addresses more and more strict.

Classification of IP addresses.

Class D addresses and Class E addresses, regardless of host address and network address.

A detailed explanation of the subnet division of IP addresses.

IPv4 addresses are classified into categories A, B, C, D, and E.

Class A: , default subnet mask 8, ie.

Among them, it is a loopback address, which is used for local loopback testing and other purposes);

Class B: , default Zibi Zheng blocking mask 16, ie;

Class C: , default subnet mask 24, ie;

Class D: Generally used for multicast.

Each IP address consists of 4 digits less than 256, with a ". " between the digits"Separate. The IP address is 32 bits and 4 bytes.

It is presented in two formats: binary format and decimal format. Binary format is a format recognized by computers, and decimal format is "translated" from binary format, mainly for ease of use and mastery.

For example, the decimal IP address is the same as the binary 10000001 01100110 00000100 00001011.

The domain name and IP address are one-to-one.

1) Class A network addresses occupy 1 byte (8 bits), the highest bit is defined as 0 to identify such addresses, and the remaining 7 bits are real network addresses. The last 3 bytes (24 bits) are the host addresses, and the number of hosts is 2 24-2. The minus 2 is all 0 and all 1, that is, in a certain network, all 0 host numbers are network addresses, and all 1 host numbers are broadcast addresses.

The others are the host addresses. The range is:

2) Class B network addresses occupy two bytes (16 bits), the highest two digits are defined as 10 to identify such addresses, and the remaining 14 bits are real network addresses. The host address accounts for the next two bytes (16 bits), and the number of hosts is 2 16-2. The range is:

3) A Class C network address occupies 3 bytes (24 bits), which is the most versatile Internet address. The highest three bits, 110, are used to identify such addresses, and the remaining 21 bits are true network addresses, so Class C addresses support 2 21-2 networks. The host address accounts for the last byte (8 bits) and can have up to 2 8-2 hosts per network.

The range is: 4) Class D addresses are fairly new. Its identification header is 1110 and is used for multicast, e.g. for router modifications. The range is:

5) For Class E addresses, the identification header is 1111. The range is:

The subnet mask is a special IP address and is used to indicate the network number part and the host number part of the IP address. The format of the subnet mask is the same as that of the IP address, and all parts corresponding to the network number are filled in with 1, and all parts corresponding to the host number are filled in with 0. That is, the subnet mask represents all 1 network numbers and all 0 host numbers of the IP address.

01 There are three main categories of IP addresses, Class A, Class B and Class C, Class D, and Class E.

02 First of all, Class A addresses are scrambling starting with 0, with a total of 126 network segments, and this type of address is mainly allocated to the backbone network for re-allocation.

03 Class B addresses, which start with 10, that is, the first two must be 10, and there are about more than 16,000 network segments, which are mainly used for medium-sized networks.

04 Finally, there is the C type address, which is fixed to the first three digits and fixed to 110, and each network segment can only connect to 254 hosts.

05 Class D and Class E are less commonly used in the state, where Class D is used for multicast, and Class E is only for trial.

The first set of numbers for a category A address is 1,126. (Note that the digits 0 and 127 are not Class A addresses, the digits 127 are reserved for the internal loopback function, and the digits 0 indicate that the address is a local host and cannot be delivered.) ）

The first set of numbers for category B addresses is 128,191.

The first set of numbers for category C addresses is 192,223.

An IP address is a 32-bit binary number that is usually split into 4 "8-bit binary numbers" (i.e. 4 bytes). IP addresses are usually expressed in the form of "dot decimal", where a, b, c, d are decimal integers between 0 and 255.

An IP address is a way to address a host on the Internet, also known as a network protocol address. Common IP addresses are divided into two categories: IPv4 and IPv6.