Internet Registry IP Allocation Guidelines
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K. Hubbard, M. Kosters, D. Conrad, D. Karrenberg, J. Postel · 1996-11
Abstract
RFC 2050 documents the policies and procedures by which Regional Internet Registries (RIRs) and Local Internet Registries (LIRs) allocate and assign IPv4 address blocks. It establishes the hierarchical registry model (IANA → RIR → LIR → end user) and the conservation principles (registration, conservation, aggregation) that govern allocation decisions.
Why This RFC Matters
RFC 2050 formalized the RIR model—ARIN, RIPE NCC, APNIC, LACNIC, AFRINIC—that remains the governance structure for IP address space today. Its conservation principles were intended to slow IPv4 exhaustion by requiring demonstrated utilization before new allocations. The registry hierarchy and justification requirements it describes laid the groundwork for RPKI, which anchors cryptographic certificates to the same RIR-issued resources.