diff --git a/src/Microsoft.Data.SqlClient/netcore/src/Interop/SNINativeMethodWrapper.Windows.cs b/src/Microsoft.Data.SqlClient/netcore/src/Interop/SNINativeMethodWrapper.Windows.cs
index 1296e4afa3..e0427b1717 100644
--- a/src/Microsoft.Data.SqlClient/netcore/src/Interop/SNINativeMethodWrapper.Windows.cs
+++ b/src/Microsoft.Data.SqlClient/netcore/src/Interop/SNINativeMethodWrapper.Windows.cs
@@ -162,6 +162,20 @@ private unsafe struct SNI_CLIENT_CONSUMER_INFO
             public TransparentNetworkResolutionMode transparentNetworkResolution;
             public int totalTimeout;
             public bool isAzureSqlServerEndpoint;
+            public SNI_DNSCache_Info DNSCacheInfo;
+        }
+
+        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+        internal struct SNI_DNSCache_Info
+        {
+            [MarshalAs(UnmanagedType.LPWStr)]
+            public string wszCachedFQDN;
+            [MarshalAs(UnmanagedType.LPWStr)]
+            public string wszCachedTcpIPv4;
+            [MarshalAs(UnmanagedType.LPWStr)]
+            public string wszCachedTcpIPv6;
+            [MarshalAs(UnmanagedType.LPWStr)]
+            public string wszCachedTcpPort;
         }
 
         [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
@@ -248,7 +262,8 @@ private static extern uint SNIOpenWrapper(
             [MarshalAs(UnmanagedType.LPWStr)] string szConnect,
             [In] SNIHandle pConn,
             out IntPtr ppConn,
-            [MarshalAs(UnmanagedType.Bool)] bool fSync);
+            [MarshalAs(UnmanagedType.Bool)] bool fSync,
+            [In] ref SNI_DNSCache_Info pDNSCachedInfo);
 
         [DllImport(SNI, CallingConvention = CallingConvention.Cdecl)]
         private static extern IntPtr SNIPacketAllocateWrapper([In] SafeHandle pConn, IOType IOType);
@@ -295,7 +310,13 @@ internal static unsafe uint SNIOpenMarsSession(ConsumerInfo consumerInfo, SNIHan
             Sni_Consumer_Info native_consumerInfo = new Sni_Consumer_Info();
             MarshalConsumerInfo(consumerInfo, ref native_consumerInfo);
 
-            return SNIOpenWrapper(ref native_consumerInfo, "session:", parent, out pConn, fSync);
+            SNI_DNSCache_Info native_cachedDNSInfo = new SNI_DNSCache_Info();
+            native_cachedDNSInfo.wszCachedFQDN = null;
+            native_cachedDNSInfo.wszCachedTcpIPv4 = null;
+            native_cachedDNSInfo.wszCachedTcpIPv6 = null;
+            native_cachedDNSInfo.wszCachedTcpPort = null;
+
+            return SNIOpenWrapper(ref native_consumerInfo, "session:", parent, out pConn, fSync, ref native_cachedDNSInfo);
         }
 
         internal static unsafe uint SNIOpenSyncEx(ConsumerInfo consumerInfo, string constring, ref IntPtr pConn, byte[] spnBuffer, byte[] instanceName, bool fOverrideCache, bool fSync, int timeout, bool fParallel)
@@ -321,6 +342,11 @@ internal static unsafe uint SNIOpenSyncEx(ConsumerInfo consumerInfo, string cons
                 clientConsumerInfo.totalTimeout = SniOpenTimeOut;
                 clientConsumerInfo.isAzureSqlServerEndpoint = ADP.IsAzureSqlServerEndpoint(constring);
 
+                clientConsumerInfo.DNSCacheInfo.wszCachedFQDN = null;
+                clientConsumerInfo.DNSCacheInfo.wszCachedTcpIPv4 = null;
+                clientConsumerInfo.DNSCacheInfo.wszCachedTcpIPv6 = null;
+                clientConsumerInfo.DNSCacheInfo.wszCachedTcpPort = null;
+
                 if (spnBuffer != null)
                 {
                     fixed (byte* pin_spnBuffer = &spnBuffer[0])
diff --git a/src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/Interop/SNINativeManagedWrapperX64.cs b/src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/Interop/SNINativeManagedWrapperX64.cs
index dd585ededa..e57dd41e64 100644
--- a/src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/Interop/SNINativeManagedWrapperX64.cs
+++ b/src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/Interop/SNINativeManagedWrapperX64.cs
@@ -90,7 +90,8 @@ internal static extern uint SNIOpenWrapper(
             [MarshalAs(UnmanagedType.LPWStr)] string szConnect,
             [In] SNIHandle pConn,
             out IntPtr ppConn,
-            [MarshalAs(UnmanagedType.Bool)] bool fSync);
+            [MarshalAs(UnmanagedType.Bool)] bool fSync,
+            [In] ref SNI_DNSCache_Info pDNSCachedInfo);
 
         [DllImport(SNI, CallingConvention = CallingConvention.Cdecl)]
         internal static extern IntPtr SNIPacketAllocateWrapper([In] SafeHandle pConn, IOType IOType);
diff --git a/src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/Interop/SNINativeManagedWrapperX86.cs b/src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/Interop/SNINativeManagedWrapperX86.cs
index 339760c1a2..c52ab82e0c 100644
--- a/src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/Interop/SNINativeManagedWrapperX86.cs
+++ b/src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/Interop/SNINativeManagedWrapperX86.cs
@@ -90,7 +90,8 @@ internal static extern uint SNIOpenWrapper(
             [MarshalAs(UnmanagedType.LPWStr)] string szConnect,
             [In] SNIHandle pConn,
             out IntPtr ppConn,
-            [MarshalAs(UnmanagedType.Bool)] bool fSync);
+            [MarshalAs(UnmanagedType.Bool)] bool fSync,
+            [In] ref SNI_DNSCache_Info pDNSCachedInfo);
 
         [DllImport(SNI, CallingConvention = CallingConvention.Cdecl)]
         internal static extern IntPtr SNIPacketAllocateWrapper([In] SafeHandle pConn, IOType IOType);
diff --git a/src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/Interop/SNINativeMethodWrapper.cs b/src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/Interop/SNINativeMethodWrapper.cs
index 499b29b4d3..e4a0af9fed 100644
--- a/src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/Interop/SNINativeMethodWrapper.cs
+++ b/src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/Interop/SNINativeMethodWrapper.cs
@@ -352,6 +352,20 @@ internal unsafe struct SNI_CLIENT_CONSUMER_INFO
             public TransparentNetworkResolutionMode transparentNetworkResolution;
             public int totalTimeout;
             public bool isAzureSqlServerEndpoint;
+            public SNI_DNSCache_Info DNSCacheInfo;
+        }
+
+        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+        internal struct SNI_DNSCache_Info
+        {
+            [MarshalAs(UnmanagedType.LPWStr)]
+            public string wszCachedFQDN;
+            [MarshalAs(UnmanagedType.LPWStr)]
+            public string wszCachedTcpIPv4;
+            [MarshalAs(UnmanagedType.LPWStr)]
+            public string wszCachedTcpIPv6;
+            [MarshalAs(UnmanagedType.LPWStr)]
+            public string wszCachedTcpPort;
         }
 
         [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
@@ -566,11 +580,12 @@ private static uint SNIOpenWrapper(
             [MarshalAs(UnmanagedType.LPWStr)] string szConnect,
             [In] SNIHandle pConn,
             out IntPtr ppConn,
-            [MarshalAs(UnmanagedType.Bool)] bool fSync)
+            [MarshalAs(UnmanagedType.Bool)] bool fSync,
+            [In] ref SNI_DNSCache_Info pDNSCachedInfo)
         {
             return s_is64bitProcess ?
-                SNINativeManagedWrapperX64.SNIOpenWrapper(ref pConsumerInfo, szConnect, pConn, out ppConn, fSync) :
-                SNINativeManagedWrapperX86.SNIOpenWrapper(ref pConsumerInfo, szConnect, pConn, out ppConn, fSync);
+                SNINativeManagedWrapperX64.SNIOpenWrapper(ref pConsumerInfo, szConnect, pConn, out ppConn, fSync, ref pDNSCachedInfo) :
+                SNINativeManagedWrapperX86.SNIOpenWrapper(ref pConsumerInfo, szConnect, pConn, out ppConn, fSync, ref pDNSCachedInfo);
         }
 
         private static IntPtr SNIPacketAllocateWrapper([In] SafeHandle pConn, IOType IOType)
@@ -699,7 +714,13 @@ internal static unsafe uint SNIOpenMarsSession(ConsumerInfo consumerInfo, SNIHan
             Sni_Consumer_Info native_consumerInfo = new Sni_Consumer_Info();
             MarshalConsumerInfo(consumerInfo, ref native_consumerInfo);
 
-            return SNIOpenWrapper(ref native_consumerInfo, "session:", parent, out pConn, fSync);
+            SNI_DNSCache_Info native_cachedDNSInfo = new SNI_DNSCache_Info();
+            native_cachedDNSInfo.wszCachedFQDN = null;
+            native_cachedDNSInfo.wszCachedTcpIPv4 = null;
+            native_cachedDNSInfo.wszCachedTcpIPv6 = null;
+            native_cachedDNSInfo.wszCachedTcpPort = null;
+
+            return SNIOpenWrapper(ref native_consumerInfo, "session:", parent, out pConn, fSync, ref native_cachedDNSInfo);
         }
 
         internal static unsafe uint SNIOpenSyncEx(ConsumerInfo consumerInfo, string constring, ref IntPtr pConn, byte[] spnBuffer, byte[] instanceName, bool fOverrideCache, bool fSync, int timeout, bool fParallel, Int32 transparentNetworkResolutionStateNo, Int32 totalTimeout, Boolean isAzureSqlServerEndpoint)
@@ -737,6 +758,11 @@ internal static unsafe uint SNIOpenSyncEx(ConsumerInfo consumerInfo, string cons
                 };
                 clientConsumerInfo.totalTimeout = totalTimeout;
 
+                clientConsumerInfo.DNSCacheInfo.wszCachedFQDN = null;
+                clientConsumerInfo.DNSCacheInfo.wszCachedTcpIPv4 = null;
+                clientConsumerInfo.DNSCacheInfo.wszCachedTcpIPv6 = null;
+                clientConsumerInfo.DNSCacheInfo.wszCachedTcpPort = null;
+
                 if (spnBuffer != null)
                 {
                     fixed (byte* pin_spnBuffer = &spnBuffer[0])