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It replaced the previous generation of IP address syntax.
CIDR is principally a bitwise, prefix-based standard for the interpretation of IP addresses. It facilitates routing by allowing blocks of addresses to be grouped together into single routing table entries. These groups, commonly called CIDR blocks , share an initial sequence of bits in the binary representation of their IP addresses.
It uses Variable length subnet mask (VLSM).
A subnet mask encodes the same information as a prefix length, but predates the advent of CIDR.
One more property that CIDR has is that it allows super-netting .
Format of CIDR n denotes the prefix. Example :- Find the first address in the block if one of the addresses is 22.214.171.124/20 . Ans: 126.96.36.199/20 . (CIDR Form)