A start of authority record (abbreviated as SOA record) is a type of resource record in the Domain Name System (DNS) containing administrative information about the zone, especially regarding zone transfers. The SOA record format is specified in RFC 1035. [1]
Normally DNS name servers are set up in clusters. The database within each cluster is synchronized through zone transfers. The SOA record for a zone contains data to control the zone transfer. This is the serial number and different timespans.
It also contains the email address of the responsible person for this zone, as well as the name of the primary master name server. Usually the SOA record is located at the top of the zone. A zone without a SOA record does not conform to the standard required by RFC 1035.
john.doe@example.com
would be represented in a zone file as john\.doe.example.com
.)Sample SOA record for example.org, in BIND syntax.
$TTL 86400
@ IN SOA ns.icann.org. noc.dns.icann.org. (
2020080302 ;Serial
7200 ;Refresh
3600 ;Retry
1209600 ;Expire
3600 ;Negative response caching TTL
)
Several methods have been established for updates to the SERIAL field of a zone's SOA record:
These recommendations are aimed at small and stable DNS zones.
A start of authority record (abbreviated as SOA record) is a type of resource record in the Domain Name System (DNS) containing administrative information about the zone, especially regarding zone transfers. The SOA record format is specified in RFC 1035. [1]
Normally DNS name servers are set up in clusters. The database within each cluster is synchronized through zone transfers. The SOA record for a zone contains data to control the zone transfer. This is the serial number and different timespans.
It also contains the email address of the responsible person for this zone, as well as the name of the primary master name server. Usually the SOA record is located at the top of the zone. A zone without a SOA record does not conform to the standard required by RFC 1035.
john.doe@example.com
would be represented in a zone file as john\.doe.example.com
.)Sample SOA record for example.org, in BIND syntax.
$TTL 86400
@ IN SOA ns.icann.org. noc.dns.icann.org. (
2020080302 ;Serial
7200 ;Refresh
3600 ;Retry
1209600 ;Expire
3600 ;Negative response caching TTL
)
Several methods have been established for updates to the SERIAL field of a zone's SOA record:
These recommendations are aimed at small and stable DNS zones.