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The ptr table

Unlike some DNS servers, MyDNS does not have the concept of zones that are authoritative for PTR records. Instead, this table is basically a straight IP-to-FQDN mapping.

id INT UNSIGNED NOT NULL
A unique number identifying this record. (Auto increment / Primary key)
minimum INT UNSIGNED NOT NULL default '86400'
The minimum TTL field that should be exported with any RR from this zone.
ex: 86400
ip INT UNSIGNED NOT NULL
The integer IP address as returned by the MySQL INET_ATON(expr) function. For example, the IP address 6.7.8.9 would be calculated as 6*256^3 + 7*256^2 + 8*256 + 9. (Unique key)
ex: 2130706433
name CHAR(255) NOT NULL
The FQDN associated with this IP address.
ex: foo.example.com.
ttl INT UNSIGNED NOT NULL default '86400'
The time interval that this resource record may be cached before the source of the information should again be consulted. Zero values are interpreted to mean that the RR can only be used for the transaction in progress, and should not be cached.
ex: 86400