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[Source] Reserve the IP address CIDR block of the IPv4 private network

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Posted on 10/14/2023 11:09:59 AM | | |
IP addresses are divided into public IP and LAN IP, where public IP is usually used as a server and can be accessed by everyone, while private IP is usually limited to mutual access within a certain region or organization.

Private IP is divided into three CIDR segments

Class A CIDR segments: 10.0.0.1 - 10.255.255.254, available addresses: 16777214, CIDR:10.0.0.0/8
Class B CIDR segment: 172.16.0.1 - 172.31.255.254, Activation address: 1048574, CIDR:172.16.0.0/12
Class C CIDR segment: 192.168.0.1 - 192.168.255.254, available address: 65534, CIDR:192.168.0.0/16

Reserve IP address

In the Internet addressing structure, the Internet Engineering Task Force (IETF) and the Internet Assigned Numbers Authority (IANA) reserve many Internet Protocol (IP) addresses for special purposes.

range
Number of addresses
utility domain
use
0.0.0.0/80.0.0.0 – 0.255.255.255
16,777,216
SoftwareUsed to broadcast information to the current host.The hyperlink login is visible.
10.0.0.0/810.0.0.0 – 10.255.255.255
16,777,216
Private networkForThe hyperlink login is visible.local communication in theThe hyperlink login is visible.
100.64.0.0/10100.64.0.0 – 100.127.255.255
4,194,304
Private networkUsed inThe hyperlink login is visible.Service providers communicate with their users in the environment.The hyperlink login is visible.
127.0.0.0/8127.0.0.0 – 127.255.255.255
16,777,216
hostUsed to localhostThe hyperlink login is visible.。The hyperlink login is visible.
169.254.0.0/16169.254.0.0 – 169.254.255.255
65,536
LinkUsed between two hosts for a single linkThe hyperlink login is visible.without specifying an IP address separately, such as usually from The hyperlink login is visible.The IP address retrieved by the server.The hyperlink login is visible.
172.16.0.0/12172.16.0.0 – 172.31.255.255
1,048,576
Private networkForThe hyperlink login is visible.local communication in theThe hyperlink login is visible.
192.0.0.0/24192.0.0.0 – 192.0.0.255
256
Private networkIPv4 Special Purpose Address Table for IANA.The hyperlink login is visible.
192.0.2.0/24192.0.2.0 – 192.0.2.255
256
documentationAssigned as "TEST-NET" for use in documentation and examples, it should not be used publicly.The hyperlink login is visible.
192.88.99.0/24192.88.99.0 – 192.88.99.255
256
internetForThe hyperlink login is visible.The hyperlink login is visible.Relay.The hyperlink login is visible.(Abandoned.)The hyperlink login is visible.）
192.168.0.0/16192.168.0.0 – 192.168.255.255
65,536
Private networkForThe hyperlink login is visible.local communication in theThe hyperlink login is visible.
198.18.0.0/15198.18.0.0 – 198.19.255.255
131,072
Private networkUsed to test inter-network communication for two different subnets.The hyperlink login is visible.
198.51.100.0/24198.51.100.0 – 198.51.100.255
256
documentationAssigned to be used for "TEST-NET-2" in documentation and examples, it should not be used publicly.The hyperlink login is visible.
203.0.113.0/24203.0.113.0 – 203.0.113.255
256
documentationAssigned for "TEST-NET-3" in documentation and examples, it should not be used publicly.The hyperlink login is visible.
224.0.0.0/4224.0.0.0 – 239.255.255.255
268,435,456
internetUsed for multicast.The hyperlink login is visible.
233.252.0.0/24233.252.0.0 - 233.252.0.255
256
documentationAssigned as "MCAST-TEST-NET" for use in documentation and examples, it should not be used publicly
240.0.0.0/4240.0.0.0 – 255.255.255.254
268,435,455
internetFor future use.The hyperlink login is visible.
255.255.255.255/32255.255.255.255
1
SubnetUsed for restricted broadcast addresses.The hyperlink login is visible.

Reference address:The hyperlink login is visible.




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