diff --git a/staticlibs/devicetests/com/android/testutils/CompatUtil.kt b/staticlibs/devicetests/com/android/testutils/CompatUtil.kt
new file mode 100644
index 0000000..4bb90a8
--- /dev/null
+++ b/staticlibs/devicetests/com/android/testutils/CompatUtil.kt
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.testutils
+
+import android.net.NetworkSpecifier
+import android.os.Build
+
+/**
+ * Test utility to create [NetworkSpecifier]s on different SDK versions.
+ */
+object CompatUtil {
+    @JvmStatic
+    fun makeTestNetworkSpecifier(ifName: String): NetworkSpecifier {
+        // Until R, there was no TestNetworkSpecifier, StringNetworkSpecifier was used instead
+        if (isDevSdkInRange(minExclusive = null, maxInclusive = Build.VERSION_CODES.R)) {
+            makeNetworkSpecifierInternal("android.net.StringNetworkSpecifier", ifName)
+        }
+        // TestNetworkSpecifier is not part of the SDK in some branches using this utility
+        // TODO: replace with a direct call to the constructor
+        return makeNetworkSpecifierInternal("android.net.TestNetworkSpecifier", ifName)
+    }
+
+    @JvmStatic
+    fun makeEthernetNetworkSpecifier(ifName: String): NetworkSpecifier {
+        // Until R, there was no EthernetNetworkSpecifier, StringNetworkSpecifier was used instead
+        if (isDevSdkInRange(minExclusive = null, maxInclusive = Build.VERSION_CODES.R)) {
+            makeNetworkSpecifierInternal("android.net.StringNetworkSpecifier", ifName)
+        }
+        // EthernetNetworkSpecifier is not part of the SDK in some branches using this utility
+        // TODO: replace with a direct call to the constructor
+        return makeNetworkSpecifierInternal("android.net.EthernetNetworkSpecifier", ifName)
+    }
+
+    private fun makeNetworkSpecifierInternal(clazz: String, specifier: String): NetworkSpecifier {
+        // StringNetworkSpecifier was removed after R (and was hidden API before that)
+        return Class.forName(clazz)
+                .getConstructor(String::class.java).newInstance(specifier) as NetworkSpecifier
+    }
+}
\ No newline at end of file
diff --git a/staticlibs/devicetests/com/android/testutils/TestNetworkTracker.kt b/staticlibs/devicetests/com/android/testutils/TestNetworkTracker.kt
index 4bd9ae8..5b97861 100644
--- a/staticlibs/devicetests/com/android/testutils/TestNetworkTracker.kt
+++ b/staticlibs/devicetests/com/android/testutils/TestNetworkTracker.kt
@@ -23,7 +23,6 @@
 import android.net.Network
 import android.net.NetworkCapabilities
 import android.net.NetworkRequest
-import android.net.StringNetworkSpecifier
 import android.net.TestNetworkInterface
 import android.net.TestNetworkManager
 import android.os.Binder
@@ -68,7 +67,7 @@
                 // Test networks do not have NOT_VPN or TRUSTED capabilities by default
                 .removeCapability(NetworkCapabilities.NET_CAPABILITY_NOT_VPN)
                 .removeCapability(NetworkCapabilities.NET_CAPABILITY_TRUSTED)
-                .setNetworkSpecifier(StringNetworkSpecifier(iface.interfaceName))
+                .setNetworkSpecifier(CompatUtil.makeTestNetworkSpecifier(iface.interfaceName))
                 .build()
         networkCallback = object : NetworkCallback() {
             override fun onAvailable(network: Network) {