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In DNS hierarchy a subdomain is a domain that is part of the main domain

DNS Zones

A DNS zone is a portion of the DNS namespace that is delegating control of portions of the namespace. A zone can contain multiple domains. A server can contain multiple zones. It is important for resolving the ip address of subdomains.

The zone itself is analogous to a database of subdomain resolutions, which can point to other more specific databases for more specific subdomains.

zone diagram