What is a TLD? Top Level Domain and sublevel explained
The TCP/IP Guide - DNS Organizational (Generic) Top Level Domains and Authorities
This is how the domain name system works – Norid
DNS root server | Cloudflare
What is DNS (Domain Name System)?
Introduction to the Domain Name System (DNS) | Opensource.com
Hosts and IP addresses
Chapter 4. introduction to DNS
What is a Root Domain?
DNS 101: An introduction to Domain Name Servers | Enable Sysadmin
Domain Name System (DNS) in Application Layer - GeeksforGeeks
Domain Name System (DNS) - DENIC eG
How to manage your domain and its DNS configuration in a website migration - Human Level
Top-level domain nameservers | Managing Mission - Critical Domains and DNS
Fully qualified domain name - Wikipedia
domain name system (DNS) :: ITWissen.info
What is a top-level domain in the domain name system (DNS)? - Quora
Levels of a Domain Name in the DNS Index (What is a DNS?)
Setting DNS A Record for Custom Domain in Jelastic PaaS | Jelastic
What are root name servers? | Netnod
Introduction to DNS
The TCP/IP Guide - DNS Structural Elements and Terminology: Domains, Subdomains, and Nodes; Roots, Leaves and Branches; Parents, Children and Siblings
A Complete Guide to Generic Top-Level Domain
OpenBSD as a domain name server - The Domain Name System
Naming scheme
Why are top level domains important? Where is it used commonly? - Quora
