diff --git a/utils/tracers/ndn-app-delay-tracer.h b/utils/tracers/ndn-app-delay-tracer.h
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+++ b/utils/tracers/ndn-app-delay-tracer.h
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+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2013 University of California, Los Angeles
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Author: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+
+#ifndef CCNX_APP_DELAY_TRACER_H
+#define CCNX_APP_DELAY_TRACER_H
+
+#include "ns3/ptr.h"
+#include "ns3/simple-ref-count.h"
+#include <ns3/nstime.h>
+#include <ns3/event-id.h>
+
+#include <boost/tuple/tuple.hpp>
+#include <boost/shared_ptr.hpp>
+#include <list>
+
+namespace ns3 {
+
+class Node;
+class Packet;
+
+namespace ndn {
+
+class App;
+
+/**
+ * @ingroup ndn
+ * @brief  network-layer tracer for aggregate packet counts
+ */
+class AppDelayTracer : public SimpleRefCount<AppDelayTracer>
+{
+public:
+  /**
+   * @brief Helper method to install tracers on all simulation nodes
+   *
+   * @param file File to which traces will be written
+   * @param averagingPeriod How often data will be written into the trace file (default, every half second)
+   *
+   * @returns a tuple of reference to output stream and list of tracers. !!! Attention !!! This tuple needs to be preserved
+   *          for the lifetime of simulation, otherwise SEGFAULTs are inevitable
+   * 
+   */
+  static boost::tuple< boost::shared_ptr<std::ostream>, std::list<Ptr<AppDelayTracer> > >
+  InstallAll (const std::string &file);
+
+  /**
+   * @brief Trace constructor that attaches to all applications on the node using node's pointer
+   * @param os    reference to the output stream
+   * @param node  pointer to the node
+   */
+  AppDelayTracer (boost::shared_ptr<std::ostream> os, Ptr<Node> node);
+
+  /**
+   * @brief Trace constructor that attaches to all applications on the node using node's name
+   * @param os        reference to the output stream
+   * @param nodeName  name of the node registered using Names::Add
+   */
+  AppDelayTracer (boost::shared_ptr<std::ostream> os, const std::string &node);
+
+  /**
+   * @brief Destructor
+   */
+  ~AppDelayTracer ();
+
+  /**
+   * @brief Print head of the trace (e.g., for post-processing)
+   *
+   * @param os reference to output stream
+   */
+  void
+  PrintHeader (std::ostream &os) const;
+  
+private:
+  void
+  Connect ();
+
+  void 
+  LastRetransmittedInterestDataDelay (Ptr<App> app, uint32_t seqno, Time delay);
+  
+  void 
+  FirstInterestDataDelay (Ptr<App> app, uint32_t seqno, Time delay);
+  
+private:
+  std::string m_node;
+  Ptr<Node> m_nodePtr;
+
+  boost::shared_ptr<std::ostream> m_os;
+};
+
+} // namespace ndn
+} // namespace ns3
+
+#endif // CCNX_CS_TRACER_H