What Does Regional Internet Registry (RIR) Mean?
A regional Internet registry (RIR) is an organization that manages the registration and allocation of Internet number resources, such as IP addresses and autonomous system (AS) numbers within a specific region of the world.
Techopedia Explains Regional Internet Registry (RIR)
A RIR is basically a governing body that holds the responsibility of controlling all Internet addresses in a given region. It has a mandate to control all IP addresses and domain registrations in operating region.