diff --git a/DnsServerCore/Dns/Applications/IDnsApplication.cs b/DnsServerCore/Dns/Applications/IDnsApplication.cs
new file mode 100644
index 00000000..ebe0eed8
--- /dev/null
+++ b/DnsServerCore/Dns/Applications/IDnsApplication.cs
@@ -0,0 +1,30 @@
+/*
+Technitium DNS Server
+Copyright (C) 2021  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.Net;
+using System.Threading.Tasks;
+using TechnitiumLibrary.Net.Dns;
+
+namespace DnsServerCore.Dns
+{
+    public interface IDnsApplication
+    {
+        Task<DnsDatagram> ProcessQueryAsync(DnsDatagram request, IPEndPoint remoteEP, string zoneName, uint appRecordTtl, string appRecordData, bool isRecursionAllowed, IDnsServer dnsServer);
+    }
+}