Classful Addressing
Definitions
Classful Addressing is a DNS and IP Addressing term for the older IPv4 class A, B, and C way of describing address blocks before CIDR became the normal way to express prefixes. 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.
“Classful Addressing showed up like an old textbook and CIDR politely took the marker.”
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