The Number Resource Organization ( NRO) is an unincorporated organization uniting the five RIRs. The NRO has entered into an agreement with ICANN for the establishment of the Address Supporting Organisation (ASO), which undertakes coordination of global IP addressing policies within the ICANN framework. Collectively, the RIRs participate in the Number Resource Organization (NRO), formed as a body to represent their collective interests, undertake joint activities, and coordinate their activities globally. The Internet Assigned Numbers Authority (IANA) delegates Internet resources to the RIRs who, in turn, follow their regional policies to delegate resources to their customers, which include Internet service providers and end-user organizations.
Regional Internet registries are components of the Internet Number Registry System, which is described in IETF RFC 7020. Regional Internet registries until 2002 Internet Assigned Numbers Authority
