This article was previously published under Q164054
This article compares and contrasts Domain Name System (DNS) Zones andDomains.
Domain name servers store information about part of the domain name spacecalled a zone. The name server is authoritative for a particular zone. Asingle name server can be authoritative for many zones.
Understanding the difference between a zone and a domain is sometimesconfusing. A zone is simply a portion of a domain. For example, theDomain Microsoft.com may contain all of the data for Microsoft.com,Marketing.microsoft.com and Development.microsoft.com. However, the zoneMicrosoft.com contains only information for Microsoft.com and references tothe authoritative name servers for the subdomains.
The zone Microsoft.com can contain the data for subdomains of Microsoft.comif they have not been delegated to another server. For example,Marketing.microsoft.com may manage its own delegated zone.Development.microsoft.com may be managed by the parent, Microsoft.com.
If there are no subdomains, then the zone and domain are essentially thesame. In this case the zone contains all data for the domain.