Regional Internet Registries (RIRs) are organizations responsible for the allocation and management of Internet Protocol (IP) address space within specific regions of the world. They ensure that IP addresses are distributed fairly and efficiently to Internet Service Providers (ISPs) and other organizations. There are five main RIRs, each serving a different geographic area: ARIN for North America, RIPE NCC for Europe, APNIC for Asia-Pacific, LACNIC for Latin America, and AFRINIC for Africa. RIRs also play a crucial role in maintaining the global Internet infrastructure by promoting best practices in IP address management and supporting the development of Internet governance. They provide resources, training, and tools to help organizations manage their IP addresses effectively. Additionally, RIRs contribute to policy development and collaborate with other stakeholders in the Internet Corporation for Assigned Names and Numbers (ICANN) ecosystem.