public enum OperationCodePublic Enumeration OperationCodepublic enum class OperationCodetype OperationCode| Query | 0 | Normal query Defined in RFC 1035. |
| InverseQuery | 1 | Inverse query Obsoleted by RFC 3425. Obsolete. |
| Status | 2 | Server status request Defined in RFC 1035. |
| Notify | 4 | Notify of zone change Defined in RFC 1996. |
| Update | 5 | Dynamic update Defined in RFC 2136. |