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Category of IP address
2022-07-07 08:43:00 【Word_ Smith_】
We know more and more IP By using , It's not just a computer at home , It also includes television , Smart home and so on have been assigned to belong to them IP, Which means , More and more IP By using , However, the most widely used is already very mature IPV4 Address . It is because of IP Addresses are more and more widely used , In order to prevent IP Not enough use , Now there is IPV6.
IPV4 And IPV6 The difference between
IPV4 from 32 Bit binary structure , It is expressed in dotted decimal ;
IPV6 from 128 Bit binary structure , It is expressed in decimal system .
IP Address components
IP The address consists of network bit and host bit , The network bits are the same , Means in a broadcast domain , In a broadcast domain , Use the host bit to distinguish different hosts . Subnet mask to distinguish between network bits and host bits , The mask consists of consecutive 0 and 1 form , among 1 On behalf of network bit ,0 Represents the host bit .
Five category IP Address
IP The address is divided into A、B、C、D、E Five category , The specific classification rules are as follows :
A:0XXX XXXX (1-126)
B:10XX XXXX (128-191)
C:110X XXXX (192-223)
D:1110 XXXX (224-239)
E:1111 XXXX (240-255)
among :
A、B、C Class is unicast address , It can be used as a source IP Address , It can also be a goal IP Address
A:255.0.0.0 Big net
B:255.255.0.0 Medium network
C:255.255.255.0 Small network
But now we usually use C class IP Address . At present, there is no specific classification IP, We now directly put what we use IP It's called no category IP.
D Class is multicast address , Only as a target IP Address using , Cannot be used as a source IP Use
E Class is reserved address
special IP Address
1、 Loopback address :127.0.0.1 - 127.255.255.254
2、 Restricted broadcast address :255.255.255.255 , It can only be used as a target IP Use
3、 All the hosts 1 The address of :192.168.1.255/24, Is the direct broadcast address , It can only be used as a target IP Address using
4、 All the hosts 0 The address of :192.168.1.0/24 , Network segment ( network address , network number )
5、0.0.0.0 Express : It can mean that there is no IP Address can also mean all IP Address
6、 Local link address / Automatic private address :169.254.0.0/16
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