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What are Regional Internet Registries (RIRs)?

A Regional Internet Registry, RIR in short, is an organization that manages the distribution and administration of unique IP addresses and autonomous system numbers (ASNs) within a particular geographic region.

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What are Regional Internet Registries (RIRs)?

A Regional Internet Registry, RIR in short, is an organization that manages the distribution and administration of unique IP addresses and autonomous system numbers (ASNs) within a particular geographic region.

Without IP addresses, devices would not be able to communicate with each other on the Internet. IP addresses must be globally unique for them to be routed correctly, and it is the responsibility of RIRs to ensure that there is no duplication or overlap in the IP address space. In addition to managing IP address allocation, RIRs also oversee ASN allocation within their respective regions. ASNs are used to identify network operators on the Internet and are required for BGP routing. Like IP addresses, ASNs must be globally unique. There are five RIRs, each responsible for a different region of the world.

The five RIRs

Each RIR is a non-profit organization governed by its membership community, which includes Internet service providers (ISPs), telecommunications companies, large corporations, academic institutions and other entities with a vested interest in the internet. RIRs operate under the authority of the Internet Corporation for Assigned Names and Numbers (ICANN), which is responsible for coordinating the global DNS and assigning unique IP address blocks to RIRs.

  • - AfriNIC (African region)
  • - APNIC (Asia-Pacific region)
  • - ARIN (North American region)
  • - LACNIC (Latin American and Caribbean region)
  • - RIPE (European region)


AfriNIC is the regional internet registry (RIR) for the African region. AfriNIC was created in 2006 in response to the need for a regional body to manage the continent's IP address allocation and assignment. AfriNIC is a member-based organization, and its members include internet service providers, telecommunication companies, government agencies, educational institutions and non-profit organizations. AfriNIC's mission is to promote the sustainable development and use of the internet in Africa.

AfriNIC manages several important resources, including the African Registry of Internet Numbers (AfRINIC), which maintains a database of IP addresses assigned to AfriNIC members. AfriNIC also allocates IP addresses to African countries and provides support for internet infrastructure development. In addition, AfriNIC educates Africans about the internet and provides training on internet technologies. AfriNIC has played a key role in promoting internet access and use in Africa, and it continues to be a vital resource for the continent's future.


APNIC is the RIR for the Asia-Pacific region. APNIC's mission is to foster internet development and cooperation in the Asia-Pacific region by providing leadership and support for technical coordination, educational activities and policy development. APNIC provides resources such as IP addresses and Autonomous System Numbers (ASNs) to members in the Asia-Pacific region. APNIC also operates services such as whois, rDNS, and reverse DNS that are used by the global Internet community. APNIC is a not-for-profit organization with over 6,000 members from over 100 countries.


ARIN is one of five regional Internet registries responsible for managing the distribution of unique Internet number resources, including IP addresses, within their respective regions. ARIN specifically manages these resources within the geographical region of North America, which includes Canada, several Caribbean and North Atlantic islands, and the United States of America. ARIN was founded in 1997, following the merging of the former NICs for Canada (CANetworks), the American Registry for Internet Numbers (ARIN), and the Caribbean Islands Registry Network (CARIN). ARIN's primary objective is to ensure that the Internet number resources within its region are utilized in a fair and impartial manner. To this end, ARIN manages a public database of whois information, provides tools and services to help people stay informed about internet number resources, and works with law enforcement agencies to help investigate cybercrime.


LACNIC is the Regional Internet Registry (RIR) for the Latin American and Caribbean region. LACNIC's mission is to ensure the stable and secure operation of the Internet in the region by providing public policies, training, and collaboration opportunities that foster the development of internet infrastructure and the use of internet technologies. LACNIC also works to promote the understanding and use of internet technologies in the region. LACNIC was founded in 2002 and is headquartered in Montevideo, Uruguay. LACNIC is a member-based organization with over 4,000 members from over 80 countries. LACNIC provides services such as IPv4 and IPv6 address allocation and assignment, ASN assignment, DNS resource registry and reverse DNS delegation. LACNIC also offers training and capacity building programs, as well as conferences and events, to support the growth and development of the Internet in the Latin American and Caribbean region.


RIPE is the regional Internet registry (RIR) for Europe, the Middle East and parts of Central Asia. It is responsible for assigning and managing IP addresses and autonomous system numbers within the RIPE service region, which includes all of Europe, the Middle East and parts of Central Asia. RIPE NCC also provides support and training to its members, helps to coordinate network operators' activities and promotes the development of a sustainable and open Internet. RIPE members include ISPs, telecommunications companies, large corporations, research networks and small-scale Internet enthusiasts. The organization operates under Dutch law as a non-profit membership association. Its headquarters are in Amsterdam, with offices in Dubai.

What do RIRs do?

So what exactly do RIRs do on a day-to-day basis? There are three main areas that RIRs focus on:

  1. Assigning IP addresses
  2. Supporting registry activities
  3. Promoting Internet infrastructure development

RIRs explained

RIRs play a vital role in ensuring the proper functioning of the Internet by managing key pieces of internet infrastructure. Without RIRs, there would be no coordination of the assignment of IP addresses or ASNs, both of which are essential to the proper routing of traffic on the internet. The five existing RIRs were established through a bottom-up, community-driven process, and they continue to be governed by their communities.

Your partner in IPv4 transfers

With a strong and proven track record in the RIPE and ARIN region, Prefix Broker is a trusted partner in reliable IPv4 brokerage and is able to mediate between parties and handle all details of an IPv4 address transaction. Whether you want to buy IPv4 address space or are looking to sell IPv4 addresses, our committed team is here for you.

Erik Bais

RIPE Specialist

“My expertise at Prefix Broker focuses on RIPE associated matters, including policies, procedures and knowledge within the community. Partly due to my knowledge and experience with ISP networks, I'm able to bridge the gap between client demand and community opportunities. This presence in the community causes many people to find us, upon which Prefix Broker picks up on demands and further engages transactions. I'm the primary point of contact for a number of named accounts, building on years of cooperation.“

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