DNS Namespace | Domain Name System | Mastering BIND DNS Server

we will discuss the concept of DNS namespace and how it works. DNS namespace is a hierarchical naming system used to map domain names to IP addresses. The namespace is divided into different levels, each representing a different category of domain names.
The whole DNS name space can be divided into 3 categories

- generic Top Level Domains (gTLDs) contains “com”, “net”, ”edu”, ”mil”, “gov”, “org”, “int”. Since the internet is expanding rapidly, few more like “biz”, “info”, “coop”, “aero”, “museum”, “name”, “pro” have been added. Every “gTLD” represents specific category.

- country code Top Level Domains (ccTLDs) uses 2-character country code. For example “us” means USA and “in” means India.

- “arpa” is a special domain used for reverse resolution.

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