Name

SOA (start of authority) — (From RFC 1035, pages 19-20)

Textual representation:

                     owner ttl class SOA source-dname mbox (serial refresh retry expire minimum)

Example:

movie.edu. IN SOA terminator.movie.edu. al.robocop.movie.edu. (
                      1        ; Serial
                      10800    ; Refresh after 3 hours
                      3600     ; Retry after 1 hour
                      604800   ; Expire after 1 week
                      86400 )  ; Minimum TTL of 1 day

Binary representation:

SOA type code: 6
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    /                     MNAME                     /
    /                                               /
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    /                     RNAME                     /
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                    SERIAL                     |
    |                                               |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                    REFRESH                    |
    |                                               |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                     RETRY                     |
    |                                               |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                    EXPIRE                     |
    |                                               |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                    MINIMUM                    |
    |                                               |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

where:

MNAME

The domain-name of the name server that was the original or primary source of data for this zone.

RNAME

A domain-name which specifies the mailbox of the person responsible for this zone.

SERIAL

The unsigned 32 bit version number of the original copy of the zone. Zone transfers preserve this value. This value wraps and should be compared using sequence space arithmetic.

REFRESH

A 32 bit time interval before the zone should be refreshed.

RETRY

A 32 bit time interval that should elapse before a failed refresh should be retried.

EXPIRE

A 32 bit time value that specifies the upper limit on the time interval ...

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