172.16/12
Definitions
172.16/12 is a DNS and IP Addressing term for the RFC 1918 private IPv4 block from 172.16.0.0 through 172.31.255.255, a middle-size private range that people often misremember. 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.
“172.16/12 corrected the whiteboard before someone accidentally reserved half the internet.”
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