CIDR
Speech parts
1. CIDR - Noun
2. CIDR - Proper noun
Meaning
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”).
Anagrams
Examples
All of these CIDR prefixes would be used, at different locations in the network.
An address can match multiple CIDR prefixes of different lengths.
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.
CIDR is based on variable-length subnet masking (VLSM) to allow allocation and routing based on arbitrary-length prefixes.
Assignment of CIDR blocks The Internet Assigned Numbers Authority (IANA) issues to regional Internet registries (RIRs) large, short-prefix CIDR blocks.
CIDR introduced an administrative process of allocating address blocks to organizations based on their actual and short-term projected needs.