We are responsible for global coordination of the Internet Protocol addressing systems, as well as the Autonomous System Numbers used for routing Internet traffic.
Currently there are two types of Internet Protocol (IP) addresses in active use: IP version 4 (IPv4) and IP version 6 (IPv6). IPv4 was initially deployed on 1 January 1983 and is still the most commonly used version. IPv4 addresses are 32-bit numbers often expressed as 4 octets in “dotted decimal” notation (for example, 192.0.2.53). Deployment of the IPv6 protocol began in 1999. IPv6 addresses are 128-bit numbers and are conventionally expressed using hexadecimal strings (for example, 2001:0db8:582:ae33::29).
Both IPv4 and IPv6 addresses are generally assigned in a hierarchical manner. Users are assigned IP addresses by Internet service providers (ISPs). ISPs obtain allocations of IP addresses from a local Internet registry (LIR) or National Internet Registry (NIR), or from their appropriate Regional Internet Registry (RIR):
Canada, USA, and some Caribbean Islands
Latin America and some Caribbean Islands
Europe, the Middle East, and Central Asia
Our primary role for IP addresses is to allocate pools of unallocated addresses to the RIRs according to their needs as described by global policy
and to document protocol assignments made by the IETF
. When an RIR requires more IP addresses for allocation or assignment within its region, we make an additional allocation to the RIR. We do not make allocations directly to ISPs or end users except in specific circumstances, such as allocations of multicast addresses or other protocol specific needs.
IP Address Allocations
Internet Protocol Version 4 (IPv4)
Internet Protocol Version 6 (IPv6)
Autonomous System Number Allocations
Regional Internet Registry Creation
- RFC 4632 — Classless Inter-domain Routing (CIDR): The Internet Address Assignment and Aggregation Plan
- RFC 1918 — Address Allocation for Private Internets
- RFC 5737 — IPv4 Address Blocks Reserved for Documentation
- RFC 4291 — Internet Protocol Version 6 (IPv6) Addressing Architecture
- RFC 3587 — IPv6 Global Unicast Address Format
- RFC 6177 — IPv6 Address Assignment to End Sites
- RFC 6890 — Special-Purpose IP Address Registries
- RFC 7020 — The Internet Numbers Registry System
- RFC 7249 — Internet Numbers Registries