Premium Member Database last update: Saturday, March 23, 2019 22:01:41 GMT-0700


Two of the most important duties of a Regional Internet Registry is to administer and register IPv4 and IPv6 address space.

If you are communicating over the internet, you are using IPv4/v6 space from one or more of the five Regional Internet Registries.

Each Regional Internet Registry handles address space within a defined area or region.


  1. AFRINIC: Africa, portions of the Indian Ocean
  2. APNIC: Portions of Asia, portions of Oceania
  3. ARIN : Canada, many Caribbean and North Atlantic islands, and the United States
  4. LACNIC: Latin America, portions of the Caribbean
  5. RIPE NCC: Europe, the Middle East, Central Asia

While each Registry handles a defined region, they may still have address space that gets reassigned to countries within the scope of another region. A good example of this is ARIN (American Registry for Internet Numbers), the largest of the five Registries.

Since the exhaustion of the IPv4 address space, ARIN has many networks that have been segmented and reassigned to countries outside ARIN?s regular scope of territory.

An excellent example of this is network block This block containing 4,096 IP addresses was assigned by ARIN to the United States on September 10, 2014. Since this time it has been segmented into 189 subnets and reassigned to several different countries, many outside North America.

For a complete list of the network segments please see:

To best monitor and control your network traffic consider purchasing a Country IP Blocks Premium Membership. Visit Country IP Blocks at Country IP Blocks.