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start of authority record


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DEFINITION - A start of authority (SOA) record is information stored in a domain name system (DNS) zone about that zone and about other DNS records. A DNS zone is the part of a domain for which an individual DNS server is responsible. Each zone contains a single SOA record. SOA records are defined in IETF RFC 1035, Domain Names - Implementation and Specification.

The SOA record stores information about the name of the server that supplied the data for the zone; the administrator of the zone; the current version of the data file; the number of seconds a secondary name server should wait before checking for updates; the number of seconds a secondary name server should wait before retrying a failed zone transfer; the maximum number of seconds that a secondary name server can use data before it must either be refreshed or expire; and a default number of seconds for the time-to-live file on resource records.

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CONTRIBUTORS: Azam Premji
LAST UPDATED: 18 Apr 2007

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More resources from around the web:
- Simple DNS Plus explains SOA-Records (Start of authority) .
- SOA records are defined in RFC 1035, Domain Names - Implementation and Specification .





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