1. CIDR - Noun
2. CIDR - Proper noun
CIDR
Acronym of Classless Inter-Domain Routing; normally an IP address notation such as 192.168.1.0/24 indicating a block of addresses. The number after the slash indicates how many bits are in the mask; bits to the right are not masked.
192.168.1.35 and 192.168.1.252 are both valid addresses in the CIDR block 192.168.1.0/24, but 192.168.2.35 is not.
CIDR
Initialism of controlled internal drug release (“technology for the controlled release of a hormone or drug, for example to release progesterone in beef cattle”).
All of these CIDR prefixes would be used, at different locations in the network. Source: Internet
An address can match multiple CIDR prefixes of different lengths. Source: Internet
An IP address is part of a CIDR block, and is said to match the CIDR prefix if the initial n bits of the address and the CIDR prefix are the same. Source: Internet
CIDR is based on variable-length subnet masking (VLSM) to allow allocation and routing based on arbitrary-length prefixes. Source: Internet
Assignment of CIDR blocks The Internet Assigned Numbers Authority (IANA) issues to regional Internet registries (RIRs) large, short-prefix CIDR blocks. Source: Internet
CIDR introduced an administrative process of allocating address blocks to organizations based on their actual and short-term projected needs. Source: Internet