Editing DNS zone (section)

==Domains and zones==
Most top-level domain name registry operators offer their namespaces to the public or entities with the mandated geographic or otherwise scoped purpose for registering second-level domains. Similarly, an organization in charge of a lower-level domain may operate its namespace and subdivide its space.

Each registration or allocation of subdomain space obligates the registrant to maintain an administrative and technical infrastructure to manage the responsibility for its zone, including sub-delegation to lower-level domains. Each delegation confers essentially unrestricted technical autonomy over the allocated space. An area of one or more subdomains that have been delegated for management is called a DNS zone. A zone always starts at a domain boundary to include all leaf nodes (hosts) in the domain or ends at the boundary of another independently managed zone.

As each domain is further divided into sub-domains, each becoming a DNS zone with its own set of administrators and DNS servers, the tree grows with the largest number of leaf nodes at the bottom. At this lowest level, in the end-nodes or leaves of the tree, the term ''DNS zone'' becomes essentially synonymous with the term "domain", both in terms of use and administration. The term ''domain'' is used in the business functions of the entity assigned to it, and the term ''zone'' is usually used for the configuration of DNS services.