CIDR
Definitions
CIDR is a DNS and IP Addressing term for Classless Inter-Domain Routing notation, such as /8 or /24, used to describe the network prefix length of an IP block. It helps people and agents name the signal, source, and safe next step without pretending an automation, campaign, DNS record, RFC, or network path did more than the evidence shows. Source context: IETF DNS technology; RFC 1918 private address space; RFC 6598 shared address space.
“CIDR made the subnet fit on one sticky note instead of three confusing paragraphs.”
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