The IPWHOIS Lookup tool displays as much information as possible for a given IP address, sourced from the Regional Internet Registry (RIR) to which the address belongs. A RIR is an organization that manages the allocation and registration of Internet number resources within a particular region of the world. Internet number resources include IP addresses and autonomous system (AS) numbers.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.