Preview lessons, content and tests

Computer Science & Programming solved. All in one platform.

1. To trial the platform and take tests, please take a few seconds to SIGN UP and SET UP FREE.
2. Searching for something specific? See our text overview of all tests. Includes 'real teacher' use videos.

Join 30000+ teachers and students using TTIO.

Internet registries

There are five Regional Internet Registries (RIRs) in the world. RIRs manage, distribute, and register Internet number resources (IPv4 and IPv6 address space and Autonomous System (AS) Numbers) within their respective regions. Check out the website for additional reading here.

Regional Internet registry - Wikipedia

Internet assigned numbers authority

IANA are responsible for global coordination of the Internet Protocol addressing systems, as well as the Autonomous System Numbers used for routing Internet traffic.

Important > IPv4 vs IPv6

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. 

Regional Internet Registries (RIRs)

RIRs operate in large, geopolitical regions that are continental in scope. Currently, there are five RIRs:

AFRINIC Serving Africa Founded in 2005
APNIC Serving the Asia Pacific region Founded in 1993
ARIN Serving North America Founded in 1997
LACNIC Serving South America and the Caribbean Founded in 2001
RIPE NCC Serving Europe, Central Asia and the Middle East Founded in 1992


The Domain Name System (DNS) is the phonebook of the Internet. Humans access information online through domain names, like or Web browsers interact through Internet Protocol (IP) addresses. DNS translates domain names to IP addresses so browsers can load Internet resources.

Each device connected to the Internet has a unique IP address which other machines use to find the device. DNS servers eliminate the need for humans to memorize IP addresses such as (in IPv4). Advanced Article > How DNS works.

DNS Explained