diff --git a/android/jni/com/mapswithme/platform/Platform.cpp b/android/jni/com/mapswithme/platform/Platform.cpp
index c1e8d5f576..9e7834423a 100644
--- a/android/jni/com/mapswithme/platform/Platform.cpp
+++ b/android/jni/com/mapswithme/platform/Platform.cpp
@@ -28,6 +28,16 @@ std::string Platform::UniqueClientId() const
   return result;
 }
 
+string Platform::MacAddress(bool md5Decoded) const
+{
+  JNIEnv * env = jni::GetEnv();
+  static jmethodID const getMacAddressMethod = jni::GetStaticMethodID(env, g_utilsClazz, "getMacAddress",
+                                                                      "(Z)Ljava/lang/String;");
+  jstring const macAddr = static_cast<jstring>(env->CallStaticObjectMethod(g_utilsClazz, getMacAddressMethod,
+                                                                           static_cast<jboolean>(md5Decoded)));
+  return jni::ToNativeString(env, macAddr);
+}
+
 std::string Platform::GetMemoryInfo() const
 {
   JNIEnv * env = jni::GetEnv();
diff --git a/android/src/com/mapswithme/util/Utils.java b/android/src/com/mapswithme/util/Utils.java
index 5c5df8e6b1..cf8b6da3c1 100644
--- a/android/src/com/mapswithme/util/Utils.java
+++ b/android/src/com/mapswithme/util/Utils.java
@@ -10,6 +10,8 @@ import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
 import android.content.res.Resources;
 import android.net.Uri;
+import android.net.wifi.WifiInfo;
+import android.net.wifi.WifiManager;
 import android.os.Build;
 import android.provider.Settings;
 import android.support.annotation.DimenRes;
@@ -40,8 +42,12 @@ import com.mapswithme.util.statistics.AlohaHelper;
 import java.io.Closeable;
 import java.io.IOException;
 import java.lang.ref.WeakReference;
+import java.net.NetworkInterface;
+import java.security.MessageDigest;
 import java.text.NumberFormat;
+import java.util.Collections;
 import java.util.Currency;
+import java.util.List;
 import java.util.Locale;
 import java.util.Map;
 
@@ -313,6 +319,77 @@ public class Utils
     return installationId;
   }
 
+  @NonNull
+  public static String getMacAddress(boolean md5Decoded)
+  {
+    final Context context = MwmApplication.get();
+    byte[] macBytes = null;
+    String address = "";
+    try
+    {
+      if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M)
+      {
+        WifiManager manager = (WifiManager) context.getApplicationContext().
+            getSystemService(Context.WIFI_SERVICE);
+        if (manager == null)
+          return "";
+        WifiInfo info = manager.getConnectionInfo();
+        address = info.getMacAddress();
+        macBytes = address.getBytes();
+      }
+      else
+      {
+        List<NetworkInterface> all = Collections.list(NetworkInterface.getNetworkInterfaces());
+        for (NetworkInterface nif : all)
+        {
+          if (!nif.getName().equalsIgnoreCase("wlan0"))
+            continue;
+
+          macBytes = nif.getHardwareAddress();
+          if (macBytes == null)
+            return "";
+
+          StringBuilder result = new StringBuilder();
+          for (int i = 0; i < macBytes.length; i++)
+          {
+            result.append(String.format("%02X", (0xFF & macBytes[i])));
+            if (i + 1 != macBytes.length)
+              result.append(":");
+          }
+          address = result.toString();
+        }
+      }
+    }
+    catch (Exception exc)
+    {
+      return "";
+    }
+    return md5Decoded ? decodeMD5(macBytes) : address;
+  }
+
+  @NonNull
+  private static String decodeMD5(@Nullable byte[] bytes)
+  {
+    if (bytes == null || bytes.length == 0)
+      return "";
+
+    try
+    {
+      MessageDigest digest = java.security.MessageDigest.getInstance("MD5");
+      digest.update(bytes);
+      byte[] messageDigest = digest.digest();
+
+      StringBuilder hexString = new StringBuilder();
+      for (int i = 0; i < messageDigest.length; i++)
+        hexString.append(String.format("%02X", (0xFF & messageDigest[i])));
+      return hexString.toString();
+    }
+    catch (Exception e)
+    {
+      return "";
+    }
+  }
+
   public static boolean isAppInstalled(@NonNull Context context, @NonNull String packageName)
   {
     try
diff --git a/local_ads/statistics.cpp b/local_ads/statistics.cpp
index 7c7e4e1c40..4ec9529b91 100644
--- a/local_ads/statistics.cpp
+++ b/local_ads/statistics.cpp
@@ -197,6 +197,8 @@ std::vector<uint8_t> SerializeForServer(std::list<local_ads::Event> const & even
   ASSERT(!events.empty(), ());
   auto root = my::NewJSONObject();
   ToJSONObject(*root, "userId", userId);
+  static std::string offlineId = GetPlatform().MacAddress(true /* md5Decoded */);
+  ToJSONObject(*root, "offlineId", offlineId);
   ToJSONObject(*root, "countryId", events.front().m_countryId);
   ToJSONObject(*root, "mwmVersion", events.front().m_mwmVersion);
   auto eventsNode = my::NewJSONArray();
diff --git a/platform/platform.hpp b/platform/platform.hpp
index 51f012ffa1..3c9433a270 100644
--- a/platform/platform.hpp
+++ b/platform/platform.hpp
@@ -251,6 +251,8 @@ public:
 
   std::string UniqueClientId() const;
 
+  std::string MacAddress(bool md5Decoded) const;
+
   /// @return url for clients to download maps
   //@{
   std::string MetaServerUrl() const;
diff --git a/platform/platform_ios.mm b/platform/platform_ios.mm
index 5d30f542ac..bf12cb12dc 100644
--- a/platform/platform_ios.mm
+++ b/platform/platform_ios.mm
@@ -124,6 +124,13 @@ int Platform::PreCachingDepth() const { return 2; }
 
 string Platform::UniqueClientId() const { return [Alohalytics installationId].UTF8String; }
 
+string Platform::MacAddress(bool md5Decoded) const
+{
+  // Not implemented.
+  UNUSED_VALUE(md5Decoded);
+  return {};
+}
+
 string Platform::GetMemoryInfo() const
 {
   struct task_basic_info info;
diff --git a/platform/platform_linux.cpp b/platform/platform_linux.cpp
index 5eb42689f9..91895da355 100644
--- a/platform/platform_linux.cpp
+++ b/platform/platform_linux.cpp
@@ -214,6 +214,13 @@ string Platform::UniqueClientId() const
   return "n0dbus0n0lsb00000000000000000000";
 }
 
+string Platform::MacAddress(bool md5Decoded) const
+{
+  // Not implemented.
+  UNUSED_VALUE(md5Decoded);
+  return {};
+}
+
 string Platform::DeviceName() const
 {
   return OMIM_OS_NAME;
diff --git a/platform/platform_mac.mm b/platform/platform_mac.mm
index 8f3c8d0eca..40bd2c614c 100644
--- a/platform/platform_mac.mm
+++ b/platform/platform_mac.mm
@@ -114,6 +114,13 @@ Platform::Platform()
 
 string Platform::UniqueClientId() const { return [Alohalytics installationId].UTF8String; }
 
+string Platform::MacAddress(bool md5Decoded) const
+{
+  // Not implemented.
+  UNUSED_VALUE(md5Decoded);
+  return {};
+}
+
 string Platform::DeviceName() const
 {
   return OMIM_OS_NAME;
diff --git a/platform/platform_win.cpp b/platform/platform_win.cpp
index bbb70ae8ca..11c5cfdd3b 100644
--- a/platform/platform_win.cpp
+++ b/platform/platform_win.cpp
@@ -136,6 +136,13 @@ string Platform::UniqueClientId() const
   return "@TODO";
 }
 
+string Platform::MacAddress(bool md5Decoded) const
+{
+  // Not implemented.
+  UNUSED_VALUE(md5Decoded);
+  return {};
+}
+
 string Platform::DeviceName() const
 {
   return OMIM_OS_NAME;