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Several methods have been established for updates to the SERIAL field of a zone's SOA record: The serial number begins at 1, and is simply incremented at every change. The serial number contains the date of the last change (in ISO 8601 basic format) followed by a two-digit counter.
SOA: 6 RFC 1035 [1] and RFC 2308 [11] Start of [a zone of] authority record Specifies authoritative information about a DNS zone, including the primary name server, the email of the domain administrator, the domain serial number, and several timers relating to refreshing the zone. SRV: 33 RFC 2782 Service locator
The client compares the serial number of the SOA resource record with the serial number in the last copy of that resource record that it has. If the serial number of the record being transferred is greater, the data in the zone are deemed to have "changed" (in some fashion) and the secondary proceeds to request the actual zone data transfer.
The format of a zone file is defined in RFC 1035 (section 5) and RFC 1034 (section 3.6.1). This format was originally used by the Berkeley Internet Name Domain (BIND) software package, but has been widely adopted by other DNS server software – though some of them (e.g. NSD, PowerDNS) are using the zone files only as a starting point to compile them into database format, see also Microsoft ...
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On July 15, 2010, the first root full production DNSSEC root zone was signed, with the SOA serial 2010071501. Root trust anchors are available from IANA . [ 48 ]