diff --git a/core/java/android/net/NetworkCapabilities.java b/core/java/android/net/NetworkCapabilities.java
index 514d24a..0154eb5 100644
--- a/core/java/android/net/NetworkCapabilities.java
+++ b/core/java/android/net/NetworkCapabilities.java
@@ -38,10 +38,7 @@
      */
     public NetworkCapabilities() {
         clearAll();
-        mNetworkCapabilities =
-                (1 << NET_CAPABILITY_NOT_RESTRICTED) |
-                (1 << NET_CAPABILITY_TRUSTED) |
-                (1 << NET_CAPABILITY_NOT_VPN);
+        mNetworkCapabilities = DEFAULT_CAPABILITIES;
     }
 
     public NetworkCapabilities(NetworkCapabilities nc) {
@@ -187,6 +184,28 @@
     private static final int MAX_NET_CAPABILITY = NET_CAPABILITY_CAPTIVE_PORTAL;
 
     /**
+     * Capabilities that are set by default when the object is constructed.
+     */
+    private static final long DEFAULT_CAPABILITIES =
+            (1 << NET_CAPABILITY_NOT_RESTRICTED) |
+            (1 << NET_CAPABILITY_TRUSTED) |
+            (1 << NET_CAPABILITY_NOT_VPN);
+
+    /**
+     * Capabilities that suggest that a network is restricted.
+     * {@see #maybeMarkCapabilitiesRestricted}.
+     */
+    private static final long RESTRICTED_CAPABILITIES =
+            (1 << NET_CAPABILITY_CBS) |
+            (1 << NET_CAPABILITY_DUN) |
+            (1 << NET_CAPABILITY_EIMS) |
+            (1 << NET_CAPABILITY_FOTA) |
+            (1 << NET_CAPABILITY_IA) |
+            (1 << NET_CAPABILITY_IMS) |
+            (1 << NET_CAPABILITY_RCS) |
+            (1 << NET_CAPABILITY_XCAP);
+
+    /**
      * Adds the given capability to this {@code NetworkCapability} instance.
      * Multiple capabilities may be applied sequentially.  Note that when searching
      * for a network to satisfy a request, all capabilities requested must be satisfied.
@@ -269,6 +288,22 @@
     }
 
     /**
+     * Removes the NET_CAPABILITY_NOT_RESTRICTED capability if all the capabilities it provides are
+     * typically provided by restricted networks.
+     *
+     * TODO: consider:
+     * - Renaming it to guessRestrictedCapability and make it set the
+     *   restricted capability bit in addition to clearing it.
+     * @hide
+     */
+    public void maybeMarkCapabilitiesRestricted() {
+        // If all the capabilities are typically provided by restricted networks, conclude that this
+        // network is restricted.
+        if ((mNetworkCapabilities & ~(DEFAULT_CAPABILITIES | RESTRICTED_CAPABILITIES)) == 0)
+            removeCapability(NET_CAPABILITY_NOT_RESTRICTED);
+    }
+
+    /**
      * Representing the transport type.  Apps should generally not care about transport.  A
      * request for a fast internet connection could be satisfied by a number of different
      * transports.  If any are specified here it will be satisfied a Network that matches