- Autonomous System
- Cloud
- Compliance
- Connectivity
- Enterprise
- gateway
- Incident Response
- Interconnection
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Who is ARIN?
The American Registry for Internet Numbers (ARIN) is a Regional Internet Registry responsible for the allocation and registration of Internet number resources, including IP addresses and Autonomous System Numbers, for organizations in its service region.
- Allocation and assignment of IPv4 and IPv6 address space (IP address management)
- Registration and management of Autonomous System Numbers (ASNs) (routing and interconnection)
- WHOIS and related directory services for Internet number resource registration data (network registry services)
- RDAP and related query services for machine-readable access to registration data (protocol-based registry access)
- Policy development and community coordination for Internet number resource administration (governance and coordination)
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More About ARIN
ARIN administers Internet number resources for organizations in Canada, the United States, and parts of the Caribbean and North Atlantic regions, providing allocation, assignment, and registration services for IPv4 and IPv6 address space and Autonomous System Numbers (ASNs). Enterprise network operators, service providers, cloud platforms, and large institutions interact with ARIN when requesting IP address space, obtaining or managing ASNs, and maintaining accurate registration records associated with their network infrastructure.
ARIN’s core services operate within the framework defined by the global Internet number resource system coordinated through the Internet Assigned Numbers Authority (IANA) and the Regional Internet Registries (RIRs). Organizations typically engage ARIN when planning or extending BGP-based (routing and interconnection) architectures, deploying multi-homed connectivity, or managing routable address blocks that underlie data centers, wide area networks, and Internet-facing services. ARIN issues and tracks IP address allocations and ASNs that are then used in routing policies, peering arrangements, and connectivity agreements between networks.
ARIN maintains public registry services, including WHOIS (network registry services) and the Registration Data Access Protocol (RDAP) (protocol-based registry access), which provide query access to registration information for IP address blocks and ASNs. These services support operational use cases such as incident response, abuse handling, routing troubleshooting, and network coordination. Network engineers and security teams query ARIN’s data to identify resource holders, contact points, and registration details that support day-to-day Internet operations and governance.
In addition to allocation and registry functions, ARIN supports a community-driven policy development process for Internet number resource management in its region. Stakeholders from service providers, enterprises, academic networks, and other organizations participate in open forums and working processes that define how IPv4 and IPv6 address space and ASNs are distributed and managed. ARIN implements these policies in its internal systems, customer portals, and registry workflows.
ARIN also provides routing-related services such as route registry entries and support for Resource PKI (RPKI) (routing security), which enterprises and providers use to document routing intentions and improve validation of Border Gateway Protocol (BGP) announcements. These capabilities integrate with operators’ routing, security, and compliance architectures, helping align registered number resources with operational routing configurations. In directory and marketplace taxonomies, ARIN fits within Internet infrastructure governance, IP address management, routing coordination, and registry and directory services for Internet number resources.
Our description of ARIN. Updated December 2025.
