diff --git a/omim.pro b/omim.pro
index 4d7cdc22ff..f204ad36ca 100644
--- a/omim.pro
+++ b/omim.pro
@@ -13,9 +13,9 @@ SUBDIRS = 3party \
           geometry \
           indexer \
           geometry/geometry_tests \
+          version \
           platform platform/platform_tests \
           yg \
-          version \
           storage storage/storage_tests \
           map \
           map/map_tests \
diff --git a/platform/platform.pro b/platform/platform.pro
index 6bb1638d97..95b32f9458 100644
--- a/platform/platform.pro
+++ b/platform/platform.pro
@@ -5,7 +5,7 @@ TEMPLATE = lib
 CONFIG += staticlib
 
 ROOT_DIR = ..
-DEPENDENCIES = base
+DEPENDENCIES = base version
 
 include($$ROOT_DIR/common.pri)
 
diff --git a/platform/qt_download.cpp b/platform/qt_download.cpp
index 6cdabc011b..8cdf37cd18 100644
--- a/platform/qt_download.cpp
+++ b/platform/qt_download.cpp
@@ -4,9 +4,76 @@
 #include "../base/logging.hpp"
 #include "../base/assert.hpp"
 
+#include "../version/version.hpp"
+
+#include "../std/target_os.hpp"
+
+#include <QNetworkInterface>
+#include <QFSFileEngine>
+#include <QDateTime>
+
 // How many times we try to automatically reconnect in the case of network errors
 #define MAX_AUTOMATIC_RETRIES 2
 
+/// @return mac address of active interface without colons or empty string if not found
+/// @note mac is converted to decimal from hex
+static QString MacAddress()
+{
+  QList<QNetworkInterface> interfaces = QNetworkInterface::allInterfaces();
+  for (int i = 0; i < interfaces.size(); ++i)
+  {
+    QNetworkInterface const & iface = interfaces.at(i);
+    QString hwAddr = iface.hardwareAddress();
+    if (!iface.addressEntries().empty()
+      && (iface.flags() & (QNetworkInterface::IsUp | QNetworkInterface::IsRunning
+                           | QNetworkInterface::CanBroadcast | QNetworkInterface::CanMulticast))
+         == iface.flags()
+      && hwAddr.size() == 17) // mac length with semicolons
+    {
+      hwAddr.remove(':');
+      bool success = false;
+      qulonglong numAddr = hwAddr.toULongLong(&success, 16);
+      if (success)
+        return QString("%1").arg(numAddr);
+    }
+  }
+  // no valid interface was found
+  return QString();
+}
+
+/// @return creation time of the root file system or empty string
+static QString FsCreationTime()
+{
+  QFileInfoList drives = QFSFileEngine::drives();
+  for (int i = 0; i < drives.size(); ++i)
+  {
+    QFileInfo const & info = drives.at(i);
+    QString const path = info.absolutePath();
+    if (path == "/" || path.startsWith("C:"))
+      return QString("%1").arg(info.created().toTime_t());
+  }
+  return QString();
+}
+
+static QString UniqueClientId()
+{
+  QString result = MacAddress();
+  if (result.size() == 0)
+  {
+    result = FsCreationTime();
+    if (result.size() == 0)
+      result = QString("------------");
+  }
+  return result;
+}
+
+static QString UserAgent()
+{
+  static QString userAgent = QString("MWM(" OMIM_OS_NAME ")/") + QString(VERSION_STRING)
+                             + QString("/") + UniqueClientId();
+  return userAgent;
+}
+
 QtDownload::QtDownload(QtDownloadManager & manager, char const * url,
   char const * fileName, TDownloadFinishedFunction & finish,
   TDownloadProgressFunction & progress, bool useResume)
@@ -63,6 +130,8 @@ void QtDownload::StartDownload(QtDownloadManager & manager, char const * url,
 void QtDownload::StartRequest()
 {
   QNetworkRequest httpRequest(m_currentUrl);
+  // set user-agent with unique client id
+  httpRequest.setRawHeader("User-Agent", UserAgent().toAscii());
   qint64 fileSize = m_file->size();
   if (fileSize > 0) // need resume
     httpRequest.setRawHeader("Range", QString("bytes=%1-").arg(fileSize).toAscii());
diff --git a/std/target_os.hpp b/std/target_os.hpp
index fec99a4eb7..b7b282c4f0 100644
--- a/std/target_os.hpp
+++ b/std/target_os.hpp
@@ -2,11 +2,13 @@
 
 #if defined(_BADA_SIMULATOR) || defined(_BADA_DEVICE)
   #define OMIM_OS_BADA
+  #define OMIM_OS_NAME "Bada"
 
 #elif defined(__APPLE__)
   #include <TargetConditionals.h>
   #if (TARGET_OS_IPHONE > 0)
     #define OMIM_OS_IPHONE
+    #define OMIM_OS_NAME "iOS"
     #if (TARGET_IPHONE_SIMULATOR > 0)
       #define OMIM_OS_IPHONE_SIMULATOR
     #else
@@ -14,6 +16,7 @@
     #endif
   #else
     #define OMIM_OS_MAC
+    #define OMIM_OS_NAME "MacOS"
   #endif
 
 #elif defined(_WIN32)
@@ -21,9 +24,12 @@
 
   #ifdef __MINGW32__
     #define OMIM_OS_WINDOWS_MINGW
+    #define OMIM_OS_NAME "MinGW"
   #else
     #define OMIM_OS_WINDOWS_NATIVE
+    #define OMIM_OS_NAME "Win"
   #endif
 #else
   #define OMIM_OS_LINUX
+  #define OMIM_OS_NAME "Linux"
 #endif