A zone is a piece of the total domain name space that is represented by a primary and secondary Domain Name Server (DNS). Zones can be of different sizes and can contain different information, stored on any number of network devices connected to the Internet.
The zone contact associated with a is the individual or contact responsible for handling certain technical aspects of a domain name, such as specifying , domain alias, and MX Record Information for a domain name. The zone contact information is kept on file with the registrar of the domain name and is also visible in the WHOIS database. The zone contact, in most cases, is the same as the technical contact for a domain name.
A zone file is an entry on a Domain Name Server (DNS) that specifies the IP Address, domain alias, MX Record and Start of Authority information for a domain name. The DNS then uses the zone file to respond to queries for domain name resresolution information.