The following illustration shows how the DNS namespace is organized.
A DNS name consists of two or more parts separated by periods, or "dots" (.). The last (rightmost) part of the name is called the top-level domain (TLD). Other parts of the name are subdomains of the TLD or another subdomain. The names of the TLDs are either functional or geographical. Subdomains usually refer to the organization that owns the domain name.
Functional TLDs suggest the purpose of the organization that has registered a subdomain in the TLD. The following table shows some of the most common functional TLD names.
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