Overview

The American Registry for Internet Numbers (ARIN) is a nonprofit organization responsible for managing and distributing Internet number resources, including IPv4 and IPv6 address space and Autonomous System Numbers (ASNs), within its service region comprising Canada, the United States, and many Caribbean and North Atlantic islands. Established in December 1997, ARIN plays a critical role in supporting the operation and growth of the Internet by ensuring the fair and efficient allocation of these resources. Beyond resource distribution, ARIN offers a suite of services to facilitate the management and security of Internet number resources, including:

• Registration and directory services (e.g., WHOIS)
• Reverse DNS delegation management
• Internet Routing Registry (IRR) services
• Resource Certification (RPKI)
• Training and educational resources

These services are accessible through the ARIN Online portal, providing organizations with the tools needed to manage their resources effectively.

Features and Capabilities

• IP Address & ASN Allocation: ARIN allocates IPv4 and IPv6 address space and Autonomous System Numbers to organizations within its service region.
• Registration Services: Provides WHOIS and RDAP directory services for public visibility of resource allocations.
• Reverse DNS Management: Offers tools for managing reverse DNS delegations, ensuring proper mapping of IP addresses to domain names.
• Internet Routing Registry (IRR): Allows network operators to submit, maintain, and retrieve router configuration information.
• Resource Certification (RPKI): Enhances routing security by certifying resources, helping to prevent IP address hijacking.
• ARIN Online Portal: A secure platform for managing resources, submitting requests, and accessing support services.
• Legacy Resource Support: Provides services to organizations with legacy resources, including WHOIS management and reverse DNS delegation.
• Educational Resources: Offers training materials, webinars, and guides to assist organizations in understanding and utilizing ARIN services.