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DNS Fundamentals

In this course, we will introduce you to the basics of the Domain Name System (DNS). We will take you through the different components of the DNS; explain resource records, the different types, and why they are useful; delve into DNS processes such as DNS delegations, DNS resolution, and caching; and discuss the importance of avoiding security risks associated with DNS behavior. There will also be short assessments along the way for you to check in and see if you are learning the key points. 

Registrant Basics: Essentials for Domain Name Holders

This course aims to educate both actual domain name holders (registrants) and the broader end-user community about the rights and responsibilities of registrants. This includes the role a registrant has in the domain name ecosystem…

Root Server Essentials

This course will explain a vital part of the Internet infrastructure – root servers – and their role in the Domain Name System (DNS) resolution process. It explores the Root Server System (RSS), common misconceptions about it…

More from ICANN

The Domain Name System

The Domain Name System (DNS) helps users navigate the Internet. Every device on the Internet has a unique address called an Internet Protocol (IP) address. IP addresses can be hard to remember. The DNS makes…

Registering Domain Names

Domain names under generic Top-Level Domain Names (gTLDs) may be registered with one of more than two thousand ICANN-accredited registrars, or their resellers. Registrars are accredited…

Spam, Phishing, and Website Content

ICANN organization doesn’t control content on the Internet. It cannot stop spam and it doesn’t deal with access to the Internet. Its agreements with …