What are the IP addresses of categories A, B, C

Class A addresses: Ranging from 0-127, 0 is reserved and represents all IP addresses, while 127 is also reserved and is used for testing loopback. Therefore, the range of Class A addresses is actually between 1-126.

For example, the first segment number is the network number, and the remaining three segments are the local computer number. Converted to binary, a Class A IP address consists of a 1-byte network address and a 3-byte host address, with the highest bit of the network address being "0" and the address range from to .

There are 126 Class A networks available, each capable of accommodating more than 100 million hosts (2 to the 24th power of hosts).

Distinguish by subnet mask:

Class B address: range from 128-191, e.g., the first and second segments are network numbers, and the remaining two segments are local computer numbers. Converted to binary, a Class B IP address consists of a 2-byte network address and a 2-byte host address, with the highest bit of the network address must be "10" and the address range is from to.

There are 16,382 Class B networks available, each capable of accommodating more than 60,000 hosts.

Distinguish by subnet mask:

Class C address: range from 192-223, e.g., the first, second, and third segments of the number are network numbers, and the remaining last segment of the number is the number of the local computer. Converted to binary, a Class C IP address consists of a 3-byte network address and a 1-byte host address, and the highest bit of the network address must be "110".

There are more than 2.09 million networks ranging from to class, and each network can accommodate 254 hosts.

Distinguish by subnet mask:

Class D addresses: Ranging from 224-239, the first byte of a Class D IP address starts with "1110", which is a specially reserved address. It does not point to a specific network, and is currently used for multicasting.

A multicast address is used to address a group of computers at a time, and it identifies a group of computers that share the same protocol.

Category E addresses: range from 240-254, starting with "11110" and reserved for future use. All zeros ("The address corresponds to the current host. The IP address of all "1" ("is the broadcast address of the current subnet.

To put it simply:

A Class A IP address consists of a 1-byte (8-bit each) network address and a 3-byte host address, with the highest bit of the network address having to be "0", i.e. the first numeric range is 1,126. Each Class A address can connect to 16387064 hosts, and the Internet has 126 Class A addresses.

2 Class B IP addresses.

A Class B IP address consists of a 2-byte network address and a 2-byte host address, and the highest digit of the network address must be "10", i.e. the first numerical range is 128 191. Each Class B address can connect to 64,516 hosts, and the Internet has 16,256 Class B addresses.

3 Class C IP addresses.

A Class C address consists of a 3-byte network address and a 1-byte host address, and the highest bit of the network address must be "110", i.e. the first numerical range is 192 223. Each Class C address can connect to 254 hosts, and the Internet has 2054512 Class C addresses.

The highest bit is 0, followed by a 7-bit network part and a 24-bit host part. In Class B addresses, the highest digit is non-zero, followed by a 14-bit network number and a 16-bit host number.

Class C addresses start with 110 and are followed by a 21-bit network number and an 8-bit host number. According to the conventional IP address, it is given by the dotted Zhefan character, and the address consists of four decimal numbers, separated by dots.

** rules for IP groups

The router is based on the network address only. When an IP packet passes through a router**, if the destination network is directly connected to the local router, the packet is delivered directly to the destination host, which is called direct delivery; Otherwise, the router looks up the routing information through the routing table and forwards the packet to the indicated next-hop router, which is called indirect delivery.

In indirect delivery, if there is a route to the destination network in the routing table, the packet is transmitted to the next-hop router specified in the routing table. If there is no route, but there is a default route in the routing table, the packet is routed to the specified default router; If there is neither, the packet is dropped and an error is reported.

Class A is: 0 127 Default Subnet Mask:

Class B is: 128 191 Default Subnet Mask:

Class C is: 192 223 Default Subnet Mask:

The difference is as follows: A type A IP address means that among the four segments of the IP address, the first segment number is the network number, and the remaining three segments are the local computer number. 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, and the highest bit of the network address must be "0".

The length of the network identity in a Class A IP address is 8 bits, and the length of the host ID is 24 bits.

A Class B IP address is one in which the first two segments of the four segments of the IP address 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, and the highest bit of the network address must be "10". In a Class B IP address, the length of the network identity is 16 bits, and the length of the host ID is 16 bits.

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. 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, and the highest bit of the network address must be "110". The length of the network ID in the Class C IP address is 24 bits, and the length of the host ID is 8 bits.

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

Class B IP addresses range from (binary representation is: 10000000 00000000 00000000 00000000001-101111111 11111111 11111111 11111110). The last one is the broadcast address.

Class C IP addresses range from (binary representation is: 11000000 0000000 000000000 00000001 - 11011111 11111111 11111111 11111110). The last one is the broadcast address.

3. The subnet mask is different

The subnet mask of a Class A IP address is.

The subnet mask of a Class B IP address is.

The subnet mask of a Class C IP address is:

4. The scope of application is different

The applicable type of Class A is a large network, with a small number of Class A network addresses, with 126 networks, and the maximum number of hosts supported by each network is 256 to the 3rd power - 2 = 16777214;

The applicable type of Class B is a medium-sized network, with a moderate number of Class B network addresses, with 16,384 networks, and the maximum number of hosts supported by each network is 256 to the 2nd power - 2 = 65,534 hosts;

Class C is applicable to small networks, with a large number of Class C network addresses, with more than 2.09 million networks, suitable for small-scale local area networks, and the maximum number of hosts supported by each network is 256 to the power of 2 - 2 = 254.

Class A. IP addresses range from - Generally used for large networks.

For a Class A address, the first segment number is the network and the next three segments are the host number, so the number of networks that can be assigned is very small, only 126, and the number of hosts that can be assigned to each network is very large, with 16777214.

Category B. IP addresses range from - Generally used for medium-sized networks.

The first two segments of a Class B address are the network number, and the last two segments are the host number. A Class B address can be assigned 16,384 networks, and each network can be assigned 65,534 hosts.

Category C. IP addresses range from - Generally used for small networks.

The first three segments of a Class C address are the network number and the last segment is the host number, so the number of networks that can be allocated is 2097152, and the number of hosts that can be assigned to each network is 254.

Category D. IP addresses range from -

A Class D IP address is a multicast address and is generally used for multicast users.

Category E. The IP address range is -

This class is reserved for special purposes.

In addition to the IP addresses mentioned above, there are also some special IP addresses, such as those corresponding to the current host. is the broadcast address of the current subnet. These addresses are used for loop testing, and can also represent local IPs, for example.

In fact, for the host number, it can also be split into a subnet number and a host number when applying, so by adding a subnet mask to the IP address, the IP address can be divided into a network number, a subnet number and a host number.

I don't know if I digress.

You go to the one in it and ask!

Someone told you!

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