diff --git a/app/src/main/java/org/fdroid/fdroid/net/WifiStateChangeService.java b/app/src/main/java/org/fdroid/fdroid/net/WifiStateChangeService.java
index d0560a052..75d76c5eb 100644
--- a/app/src/main/java/org/fdroid/fdroid/net/WifiStateChangeService.java
+++ b/app/src/main/java/org/fdroid/fdroid/net/WifiStateChangeService.java
@@ -229,7 +229,7 @@ public class WifiStateChangeService extends IntentService {
         }
     }
 
-    private String formatIpAddress(int ipAddress) {
+    static String formatIpAddress(int ipAddress) {
         if (ipAddress == 0) {
             return null;
         }
diff --git a/app/src/test/java/org/fdroid/fdroid/net/WifiStateChangeServiceTest.java b/app/src/test/java/org/fdroid/fdroid/net/WifiStateChangeServiceTest.java
new file mode 100644
index 000000000..365b81ffc
--- /dev/null
+++ b/app/src/test/java/org/fdroid/fdroid/net/WifiStateChangeServiceTest.java
@@ -0,0 +1,20 @@
+package org.fdroid.fdroid.net;
+
+import org.junit.Test;
+
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+
+public class WifiStateChangeServiceTest {
+
+    @Test
+    public void testFormatIpAddress() throws UnknownHostException {
+        for (long i = Integer.MIN_VALUE; i <= Integer.MAX_VALUE; i += 98273) {
+            String ip = WifiStateChangeService.formatIpAddress((int) i);
+            InetAddress.getByName(ip);
+        }
+        InetAddress.getByName(WifiStateChangeService.formatIpAddress(Integer.MAX_VALUE));
+        InetAddress.getByName(WifiStateChangeService.formatIpAddress(Integer.MIN_VALUE));
+        InetAddress.getByName(WifiStateChangeService.formatIpAddress(0));
+    }
+}