Overview

A regional Internet registry (RIR) is a specialized organization that administers the distribution and registration of Internet number resources, such as IPv4 and IPv6 address blocks and autonomous system (AS) numbers, for a defined geographic area. RIRs act as the primary point of contact for providers, network operators and governments seeking official assignments and public records of these resources. They maintain authoritative registries and publish information used by operators and network tools.

Core responsibilities

Typical responsibilities include allocating address space to local Internet registries (LIRs), validating requests, maintaining public databases (often called WHOIS or RDAP), delegating reverse DNS zones, and supporting routing security through systems like RPKI. RIRs also collect and provide statistics about address distribution and offer training, outreach and technical assistance to their communities.

History and coordination

The RIR system emerged to replace earlier informal practices and to introduce regional governance for scarce public resources. Global coordination links RIRs with the Internet Assigned Numbers Authority (IANA), which assigns large address blocks to RIRs. RIRs work together through cooperative forums and an umbrella body that represents collective interests and facilitates technical liaison and policy harmonization.

Policies and regional differences

Policy development at each RIR is community-driven and relies on open, bottom-up processes that allow stakeholders to propose and adopt rules for allocation and transfer. Because policies reflect regional needs and consensus, practices can differ between registries—especially around address transfer rules, scarcity management and membership models. These differences can affect how organizations obtain resources in different parts of the world.

Practical importance and services

RIRs provide services that keep the global Internet functioning reliably: accurate resource records help operators manage routing, mitigate abuse, and validate origin announcements. They also facilitate transfers and reclamation when address space becomes scarce. For more technical details about the types of resources they register, see Internet number resources.

Active registries

  • AFRINIC — Africa
  • APNIC — Asia Pacific
  • ARIN — North America
  • LACNIC — Latin America and Caribbean
  • RIPE NCC — Europe, Middle East and parts of Central Asia

Although regional in scope, RIRs are essential components of the global addressing system. They balance technical allocation, community governance and public record keeping to support interoperable and secure Internet operations worldwide.