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The Internet naming system is usually called the Domain Name System (DNS). It lets people use names such as icann.org instead of memorizing numeric IP addresses, by linking domain names to Internet addressing information. DNS is hierarchical and distributed, while globally consistent names depend on coordination of shared records and policies.
How the Internet naming system is organized
DNS has a hierarchy. At the top is the root, beneath which are top-level domains (TLDs), such as .edu and .in. Domain names are organized below those TLDs. This structure allows names to be delegated and administered in parts rather than held in one central directory. IANA’s root-zone overview describes the root as the highest DNS level and explains its role in recording delegation information.
The public root helps the public Internet interpret names consistently. ICANN’s policy explanation describes the rationale for a unique, authoritative public root: a shared reference point helps avoid conflicting answers about what a name means. ICANN’s explanation of the unique root sets out that rationale.
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What happens when you use a domain name?
When you enter a domain such as icann.org, DNS provides the naming layer that connects that familiar name with Internet addressing information used in communication. People can refer to a readable name rather than memorize an IP address.
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This is the purpose of DNS, not a complete description of every step a device takes to reach a destination. The definition alone does not specify the detailed sequence of queries between a device, recursive resolvers, and authoritative servers.
Who coordinates the naming system?
IANA administers shared technical registries and root-zone information
IANA maintains public registries for globally coordinated technical identifiers. For DNS, its root-zone responsibilities include assigning TLD managers and recording technical delegation data. These records support consistent interpretation of names across the network. IANA’s overview explains why globally consistent identifiers matter, and its root-zone overview describes its DNS responsibilities.
ICANN coordinates parts of the system; it does not run the Internet
ICANN coordinates aspects of the global naming system and related policy. It does not run every part of DNS, operate the entire Internet, or control Internet content. Its explainer describes DNS as a system that makes the Internet accessible to people by linking names and IP addresses. Read ICANN’s explanation of its role.
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DNS is distributed, but names that need to work across the public Internet require shared identifiers and coordinated root-zone information. Without a common reference for the public root, different systems could interpret the same domain name in conflicting ways. IANA’s registry and root-zone work and ICANN’s coordination roles address distinct parts of that shared naming framework.
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