The regional Internet registries are informally liaised through the unincorporated Number Resource Organization (NRO), which is a coordinating body to act on matters of global importance.

[8] Collectively, the RIRs participate in the Number Resource Organization (NRO),[9] formed as a body to represent their collective interests, undertake joint activities, and coordinate their activities globally.

The NRO has entered into an agreement with ICANN for the establishment of the Address Supporting Organisation (ASO),[10] which undertakes coordination of global IP addressing policies within the ICANN framework.

[9] It came into existence on October 24, 2003, when the four existing RIRs entered into a memorandum of understanding (MoU) in order to undertake joint activities, including joint technical projects and policy coordination.

[11] Most LIRs are Internet service providers, enterprises, or academic institutions.