The management and administration of Internet number resources will be examined in this tutorial. Beginning with an overview of the Regional Internet Registry (RIR) system, the structure, characteristics, and services of an RIR will be explored. Current trends in the global structure, such as the Number Resource Organization (NRO), Address Supporting Organization (ASO), and the World Summit on the Information Society (WSIS) will be discussed. Specific ARIN activities such as registration services, policy development, training, and elections will be detailed. Lastly, the current state of the distribution of Internet number resources will be detailed.