ZoneOfAuthority object
The ZoneOfAuthority object handles the SOA records. The SOA record marks the start of a zone of authority. Use the ZoneOfAuthority property to access the SOA records. The ZoneOfAuthority object supports the following properties and methods:

  ExpireRetrieves the time value that specifies the upper limit on the time interval that can elapse before the zone is no longer authoritative. 
  MailboxServerNameSpecifies the mailbox of the person responsible for this zone. 
  MinimumSpecifies the time to live for this record. 
  PrimaryNameServerSpecifies the name server that was the original or primary source of data for this zone. 
  RefreshSpecifies the time interval before the zone should be refreshed. 
  RetrySpecifies the time interval that should elapse before a failed refresh should be retried. 
  SerialSpecifies the 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.