Technical Terms and Definitions

ARIN - Organizations

ARIN is a non-profit organization established for the purpose of administration and registration of Internet Protocol (IP) numbers for the following geographical areas:

  • North America,
  • South America,
  • the Caribbean and
  • sub-Saharan Africa.

ARIN is one of three Regional Internet Registries (RIRs) worldwide which collectively provide IP registration services to all regions around the globe. The others are:
  • RIPE NCC - Europe, Middle East, parts of Africa
  • APNIC Asia Pacific

Other registry organizations are separately responsible for registering and maintaining domain names, which are commonly used unique identifiers that are translated into numeric addresses (IP numbers). IP numbers are globally unique, numeric identifiers that computers use to identify hosts and networks connected to the Internet.

ARIN is responsible for maintaining a public trust. Among its responsibilities, ARIN promotes the conservation of IP address space, maintains impartiality while determining the size of address blocks to be allocated or assigned, and supports efforts to keep the global routing tables to a manageable size to ensure routability of information over the Internet. Continued operation of the Internet depends, in part, upon the conservation and efficient use of IP address space.

Among ARIN's tasks are the management of IP numbers, autonomous system numbers (ASNs), and IN-ADDR.ARPA or IP6.INT inverse mapping, as well as database maintenance, verification of reassignment information, and maintaining a routing registry where network operators can submit, maintain, and retrieve router configuration information. Open structures and processes are maintained in all of ARIN's daily operations to ensure that the needs of the Internet community are adequately met.