diff --git a/framework/api/module-lib-current.txt b/framework/api/module-lib-current.txt
index d2ed73e..a55ed6f 100644
--- a/framework/api/module-lib-current.txt
+++ b/framework/api/module-lib-current.txt
@@ -7,6 +7,7 @@
 
   public class ConnectivityManager {
     method @NonNull @RequiresPermission(anyOf={android.net.NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK, android.Manifest.permission.NETWORK_STACK, android.Manifest.permission.NETWORK_SETTINGS}) public java.util.List<android.net.NetworkStateSnapshot> getAllNetworkStateSnapshot();
+    method @NonNull public static android.util.Range<java.lang.Integer> getIpSecNetIdRange();
     method @RequiresPermission(anyOf={android.net.NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK, android.Manifest.permission.NETWORK_SETTINGS}) public void registerSystemDefaultNetworkCallback(@NonNull android.net.ConnectivityManager.NetworkCallback, @NonNull android.os.Handler);
     method @RequiresPermission(anyOf={android.Manifest.permission.NETWORK_SETTINGS, android.Manifest.permission.NETWORK_STACK, android.net.NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK}) public void requestBackgroundNetwork(@NonNull android.net.NetworkRequest, @Nullable android.os.Handler, @NonNull android.net.ConnectivityManager.NetworkCallback);
     method @RequiresPermission(anyOf={android.Manifest.permission.MANAGE_TEST_NETWORKS, android.Manifest.permission.NETWORK_STACK}) public void simulateDataStall(int, long, @NonNull android.net.Network, @NonNull android.os.PersistableBundle);
diff --git a/framework/src/android/net/ConnectivityManager.java b/framework/src/android/net/ConnectivityManager.java
index 45ed317..a2fcdd6 100644
--- a/framework/src/android/net/ConnectivityManager.java
+++ b/framework/src/android/net/ConnectivityManager.java
@@ -5040,4 +5040,21 @@
             throw e.rethrowFromSystemServer();
         }
     }
+
+    // The first network ID of IPSec tunnel interface.
+    private static final int TUN_INTF_NETID_START = 0xFC00;
+    // The network ID range of IPSec tunnel interface.
+    private static final int TUN_INTF_NETID_RANGE = 0x0400;
+
+    /**
+     * Get the network ID range reserved for IPSec tunnel interfaces.
+     *
+     * @return A Range which indicates the network ID range of IPSec tunnel interface.
+     * @hide
+     */
+    @SystemApi(client = MODULE_LIBRARIES)
+    @NonNull
+    public static Range<Integer> getIpSecNetIdRange() {
+        return new Range(TUN_INTF_NETID_START, TUN_INTF_NETID_START + TUN_INTF_NETID_RANGE - 1);
+    }
 }
diff --git a/services/core/java/com/android/server/NetIdManager.java b/services/core/java/com/android/server/NetIdManager.java
index 097fb3a..61925c8 100644
--- a/services/core/java/com/android/server/NetIdManager.java
+++ b/services/core/java/com/android/server/NetIdManager.java
@@ -17,6 +17,7 @@
 package com.android.server;
 
 import android.annotation.NonNull;
+import android.net.ConnectivityManager;
 import android.util.SparseBooleanArray;
 
 import com.android.internal.annotations.GuardedBy;
@@ -31,7 +32,7 @@
     // Sequence number for Networks; keep in sync with system/netd/NetworkController.cpp
     public static final int MIN_NET_ID = 100; // some reserved marks
     // Top IDs reserved by IpSecService
-    public static final int MAX_NET_ID = 65535 - IpSecService.TUN_INTF_NETID_RANGE;
+    public static final int MAX_NET_ID = ConnectivityManager.getIpSecNetIdRange().getLower() - 1;
 
     @GuardedBy("mNetIdInUse")
     private final SparseBooleanArray mNetIdInUse = new SparseBooleanArray();
diff --git a/tests/net/java/com/android/server/IpSecServiceTest.java b/tests/net/java/com/android/server/IpSecServiceTest.java
index f97eabf..6232423 100644
--- a/tests/net/java/com/android/server/IpSecServiceTest.java
+++ b/tests/net/java/com/android/server/IpSecServiceTest.java
@@ -35,6 +35,7 @@
 import static org.mockito.Mockito.when;
 
 import android.content.Context;
+import android.net.ConnectivityManager;
 import android.net.INetd;
 import android.net.IpSecAlgorithm;
 import android.net.IpSecConfig;
@@ -47,6 +48,7 @@
 import android.system.ErrnoException;
 import android.system.Os;
 import android.system.StructStat;
+import android.util.Range;
 
 import androidx.test.filters.SmallTest;
 import androidx.test.runner.AndroidJUnit4;
@@ -647,9 +649,9 @@
 
     @Test
     public void testReserveNetId() {
-        int start = mIpSecService.TUN_INTF_NETID_START;
-        for (int i = 0; i < mIpSecService.TUN_INTF_NETID_RANGE; i++) {
-            assertEquals(start + i, mIpSecService.reserveNetId());
+        final Range<Integer> netIdRange = ConnectivityManager.getIpSecNetIdRange();
+        for (int netId = netIdRange.getLower(); netId <= netIdRange.getUpper(); netId++) {
+            assertEquals(netId, mIpSecService.reserveNetId());
         }
 
         // Check that resource exhaustion triggers an exception
@@ -661,7 +663,7 @@
 
         // Now release one and try again
         int releasedNetId =
-                mIpSecService.TUN_INTF_NETID_START + mIpSecService.TUN_INTF_NETID_RANGE / 2;
+                netIdRange.getLower() + (netIdRange.getUpper() - netIdRange.getLower()) / 2;
         mIpSecService.releaseNetId(releasedNetId);
         assertEquals(releasedNetId, mIpSecService.reserveNetId());
     }