IP address category and Special IP Address

Class:0xxx XXXX. x/8, that is, 1 ~ 127, 126 available.

Because 0. x indicates all networks; 127. x/8 indicates the Back-to-loop address and the TCP/IP protocol test address.

=>10. x/8 is a private address.

Class B:10xx XXXX. x/16, that is, 128 ~ 191.

=>172.16.x.x ~ 172.31.x.x is a private address.

Class C:110x XXXX. x/24, that is, 192 ~ 223.

=>192.168.x.x/16 is a private address.

Class D:1110 XXXX. x, that is, 224 ~ Class 239 and Class D addresses are used as backups to transmit multi-destination information.

Class E:1111 XXXX. x, that is, 240 ~ 254. Class E addresses are retained and used only for Internet experiments and development.

Because 255. x is the network-wide broadcast address.

It indicates that the binary bits of the host are all 0 or all 1 cannot be used. All 0 indicates this site, and all 1 indicates this site broadcast.

Other special types of IP addresses:

(1) 0.0.0.0 indicates a set of unknown hosts and destination networks.

(2) broadcast bandwidth limit 255: the broadcast address cannot be forwarded by the router.

(3) 127.0.0.1 local address.

(4) 224.0.0.1 multicast address. Pay attention to the difference between it and broadcast. From 224.0.0.0 to 239.255.255.255. 224.0.0.1 refers to all hosts and 224.0.0.2 refers to all routers. After you enable the IRDP (Internet route Discovery protocol, use the multicast function) function, there will be such a route.

(5) 169.254.x.x if your host uses the DHCP function to automatically obtain an IP address, when your DHCP server fails or the response time is too long and exceeds the time specified by the system, the Windows system will assign you such an address.