The DNS_RPC_ZONE_LIST_W2K structure is used to enumerate zones.

 typedef struct _DnssrvRpcZoneListW2K {
   [range(0,500000)] DWORD dwZoneCount;
   [size_is(dwZoneCount)] PDNS_RPC_ZONE_W2K ZoneArray[];
 } DNS_RPC_ZONE_LIST_W2K,
  *PDNS_RPC_ZONE_LIST_W2K;

dwZoneCount: The number of zones present in the array of zones pointed to by ZoneArray.

ZoneArray: An array of structures of type DNS_RPC_ZONE_W2K (section 2.2.5.2.1.1). Each element of the array represents one zone.