diff --git a/DnsServerCore/Dns/Zones/PrimarySubDomainZone.cs b/DnsServerCore/Dns/Zones/PrimarySubDomainZone.cs
new file mode 100644
index 00000000..13ba4b01
--- /dev/null
+++ b/DnsServerCore/Dns/Zones/PrimarySubDomainZone.cs
@@ -0,0 +1,89 @@
+/*
+Technitium DNS Server
+Copyright (C) 2020  Shreyas Zare (shreyas@technitium.com)
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+using System.Collections.Generic;
+using TechnitiumLibrary.Net.Dns;
+
+namespace DnsServerCore.Dns.Zones
+{
+    public class PrimarySubDomainZone : SubDomainZone
+    {
+        #region variables
+
+        readonly PrimaryZone _primaryZone;
+
+        #endregion
+
+        #region constructor
+
+        public PrimarySubDomainZone(PrimaryZone primaryZone, string name)
+            : base(name)
+        {
+            _primaryZone = primaryZone;
+        }
+
+        #endregion
+
+        #region public
+
+        public override void SetRecords(DnsResourceRecordType type, IReadOnlyList<DnsResourceRecord> records)
+        {
+            base.SetRecords(type, records);
+
+            _primaryZone.IncrementSoaSerial();
+            _primaryZone.NotifyNameServers();
+        }
+
+        public override void AddRecord(DnsResourceRecord record)
+        {
+            base.AddRecord(record);
+
+            _primaryZone.IncrementSoaSerial();
+            _primaryZone.NotifyNameServers();
+        }
+
+        public override bool DeleteRecords(DnsResourceRecordType type)
+        {
+            if (base.DeleteRecords(type))
+            {
+                _primaryZone.IncrementSoaSerial();
+                _primaryZone.NotifyNameServers();
+
+                return true;
+            }
+
+            return false;
+        }
+
+        public override bool DeleteRecord(DnsResourceRecordType type, DnsResourceRecordData record)
+        {
+            if (base.DeleteRecord(type, record))
+            {
+                _primaryZone.IncrementSoaSerial();
+                _primaryZone.NotifyNameServers();
+
+                return true;
+            }
+
+            return false;
+        }
+
+        #endregion
+    }
+}