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The Internet Assigned Numbers Authority (IANA) is responsible for the global coordination of the DNS Root, IP addressing, and other Internet protocol resources. Following the IANA Stewardship Transition in 2016, the IANA function is carried out by Public Technical Identifiers (PTI), a purpose-built organisation wholly owned by ICANN.

With regard to Internet number resources, IANA's role is to allocate IP addresses and AS Numbers from the pools of unallocated resources to the Regional Internet Registries (RIRs) according to their needs, and to document protocol assignments made by the IETF. When an RIR requires more IP addresses for allocation or assignment within its region, IANA makes an additional allocation to the RIR. The five Regional Internet Registries have a Service Level Agreement with ICANN regarding provision of those IANA functions relating to Internet number resources (IP addresses and AS Numbers).

IANA does not make allocations directly to ISPs or End Users except in specific circumstances, such as allocations of multicast addresses or other protocol-specific needs.

Global Policy Development

The policies under which the IANA role is carried out are referred to as Global Addressing Policies, and must be agreed to by all of the five RIR communities. Any new policy proposal must go through the Policy Development Process in each RIR and be ratified by each community, and this process will then be reviewed by the ASO Address Council (ASO AC) before the new global policy is adopted.

More information:


  • Publications / News
    The Address Council of the New IANA

    Position Statement of the existing Regional Internet Registries v1.024 July 1998SCOPEThis statement proposes structures and processes that address oneaspect of the 'New Corporation' proposed by, among others, the USGovernment 'White Paper' on Internet governance. In this statement werefer to this e

    NewsItem iana aso internet coordination news
  • Publications / News
    Considerations for the Establishment of the 'New IANA'

    v1.0.24 July 1998SCOPEThis statement describes some considerations for the 'New Corporation' proposed by, among others, the US Government 'White Paper' on Internet governance. In this statement we refer to this entity as the 'New IANA'. This statement describes the position of the existing three re

    NewsItem iana internet coordination news