What is the ASO
The Address Supporting Organization (ASO) is one of the supporting organisations that the ICANN Bylaws say should be “formed through community consensus”. The purpose of the ASO is to review and develop recommendations on Internet Protocol (IP) address policy and to advise the ICANN Board.
In July 1999, the three existing Regional Internet Registries (APNIC, ARIN, and RIPE NCC) submitted a proposal to form the ASO on the basis of a Memorandum of Understanding. ICANN accepted this proposal on 26 August 1999.
The ASO was formed on 19 October 1999, when the MoU was signed by representatives of APNIC, ARIN, and RIPE NCC and ICANN. This happened during the ARIN Open Policy Meeting in Denver, USA. LACNIC signed the MoU in 30 October 2002 following its official recognition as an RIR.
A new Memorandum of Understanding between ICANN and the Number Resource Organization, on behalf of the Regional Internet Registries, was signed on 21 October 2004 at ARIN XIV in Reston, Virginia.