Classless Inter-Domain Routing
Bit-level, prefix-based IP address standard analysis method presenting Subnet mask
With the introduction of CIDR, IP addresses can be divided into network segments more flexibly than the Class system
CIDR can also be used with IPv6 addresses, where due to the longer address length, the prefix length ranges from 0 to 128. The same syntax is used in this case as well
CIDR Notion
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