In what type of IP address, the first 16 digits represent the network number and the last 16 digits represent the host number.

The first 16 digits of the Class B IP address represent the network number, and the last 16 digits represent the host number. The length of the network identifier in the Class B IP address is 16 bits, and the length of the host identifier is 16 bits. Class B network addresses are suitable for medium-sized networks. There are 16,384 networks, and each network can accommodate more than 60,000 computers. tower.

The operating environment of this tutorial: Windows 10 system, Dell G3 computer.

IP address (Internet Protocol Address) refers to the Internet Protocol address, also translated as Internet Protocol address.

The IP address is a unified address format provided by the IP protocol. It assigns a logical address to each network and each host on the Internet to shield the differences in physical addresses.

IP address addressing method

When the Internet was originally designed, in order to facilitate addressing and hierarchically construct the network, each IP address includes Two identification codes (ID), namely network ID and host ID. All hosts on the same physical network use the same network ID. A host on the network (including workstations, servers, routers, etc.) on the network has a host ID corresponding to it. The Internet Committee has defined 5 IP address types to suit networks of different capacities, namely Class A ~ Class E.

Among them, categories A, B, and C3 (table below) are uniformly allocated globally by InternetNIC, and categories D and E are special addresses.

Class A IP address

A Class A IP address means that among the four numbers in the IP address, the first number is the network number, and the remaining three numbers are is the number of the local computer. If the IP address is represented in binary, the Class A IP address consists of a 1-byte network address and a 3-byte host address. The highest bit of the network address must be "0". The length of the network identifier in a Class A IP address is 8 bits, and the length of the host identifier is 24 bits. The number of Class A network addresses is relatively small, with 126 networks, and each network can accommodate more than 16 million hosts.

Class A IP address address range 1.0.0.1 to 127.255.255.254 (binary representation: 00000001 00000000 00000000 00000001 - 01111111 11111111 11111111 11111110). The last one is the broadcast address.

Class B IP address

A Class B IP address means that among the four numbers in the IP address, the first two numbers are network numbers. If the IP address is represented in binary, the Class B IP address consists of a 2-byte network address and a 2-byte host address. The highest bit of the network address must be "10".The length of the network identifier in the Class B IP address is 16 bits, and the length of the host identifier is 16 bits. Class B network addresses are suitable for medium-sized networks. There are 16384 networks, and each network can accommodate The number of computers is more than 60,000.

Class B IP address range 128.0.0.1-191.255.255.254 (binary representation: 10000000 00000000 00000000 00000001----10111111 11111111 11111111 11111110). The last one is the broadcast address.

The subnet mask of Class B IP address is 255.255.0.0, and the maximum number of hosts supported by each network is 256 to the power of 2-2=65534.

Class C IP address

A Class C IP address means that among the four numbers in the IP address, the first three numbers are network numbers, and the remaining A number is the number of the local computer. If the IP address is represented in binary, the Class C IP address consists of a 3-byte network address and a 1-byte host address. The highest bit of the network address must be "110". The length of the network identifier in a Class C IP address is 24 bits, and the length of the host identifier is 8 bits. There are more Class C network addresses, with more than 2.09 million networks. Suitable for small-scale local area networks, each network can only contain up to 254 computers.

Class C IP address range 192.0.0.1-223.255.255.254 (binary representation is: 11000000 00000000 00000000 00000001 - 11011111 11111111 11111111 11111110).

The subnet mask of Class C IP address is 255.255.255.0, and the maximum number of hosts supported by each network is 256-2=254 units

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##B 16384(2^14) 128.0.0.1-191.255.255.254 65534 172.16.0.0-172.31.255.255 C 2097152(2^21) 192.0.0.1-223.255.255.254 254

Category	Maximum number of networks	IP address range	Maximum number of hosts in a single network segment	Private IP address range
A	126(2^7-2)	1.0.0.1-127.255.255.254	16777214	##10.0.0.0-10.255.255.255
			##192.168.0.0-192.168.255.255

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