Number-related Registries Domains Protocols Numbers About Number-related Registries These are the registries we maintain for the three core number resource types: IPv4 addresses, IPv6 addresses, and Autonomous System Numbers. Registry Description Internet Protocol Version 4 (IPv4) IPv4 Address Space The top-level delegation of the IPv4 unicast address space. IPv4 Multicast Address Space Assignments within the IPv4 multicast address range. IPv4 Special-Purpose Address Space Address blocks reserved for special uses, such as private networks and documentation. IPv4 Recovered Address Space Address space returned to IANA and redistributed to the RIRs. RDAP Bootstrap for IPv4 The registration data service operators for each IPv4 address range. Locally Served DNS Zones Reverse DNS zones for private and special-use addresses that should be answered locally (covers IPv4 and IPv6). Internet Protocol Version 6 (IPv6) IPv6 Address Space The top-level delegation of the IPv6 address space. IPv6 Global Unicast Address Space Allocations of global unicast address blocks, primarily to the RIRs. IPv6 Anycast Address Space Reserved anycast addresses within IPv6. IPv6 Multicast Address Space Assignments within the IPv6 multicast address range. IPv6 Special-Purpose Address Space Address blocks reserved for special uses, such as documentation and translation mechanisms. IPv6 Sub-TLA Assignments A deprecated historical registry from the early IPv6 allocation scheme. RDAP Bootstrap for IPv6 The registration data service operators for each IPv6 address range. Autonomous System Numbers Autonomous System Numbers Allocations of AS number blocks, primarily to the RIRs. Special-Purpose AS Numbers AS numbers reserved for special uses, such as documentation and private use. RDAP Bootstrap for AS Numbers The registration data service operators for each AS number range. Number Resources Overview Registries Documents RIR Allocation Data Overview IPv6 (AFRINIC) IPv6 (APNIC) IPv6 (ARIN) IPv6 (LACNIC) IPv6 (RIPE NCC) ASN (AFRINIC) ASN (APNIC) ASN (ARIN) ASN (LACNIC) ASN (RIPE NCC) Abuse Information Domain Names Root Zone Registry .INT Registry .ARPA Registry IDN Repository Number Resources Number Registries RIR Allocation Data Abuse Information Protocols Protocol Registries Time Zone Database About Us News Performance The Organization Archive Contact Us The IANA functions coordinate the Internet’s globally unique identifiers, and are provided by Public Technical Identifiers, an affiliate of ICANN. Privacy Policy Terms of Service