diff --git a/src/util/network-address.cpp b/src/util/network-address.cpp
new file mode 100644
index 0000000..5744aba
--- /dev/null
+++ b/src/util/network-address.cpp
@@ -0,0 +1,60 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2017 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library 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 Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ *
+ * @author Davide Pesavento <davide.pesavento@lip6.fr>
+ */
+
+#include "network-address.hpp"
+
+namespace ndn {
+namespace util {
+
+std::ostream&
+operator<<(std::ostream& os, AddressScope scope)
+{
+  switch (scope) {
+    case AddressScope::NOWHERE:
+      return os << "nowhere";
+    case AddressScope::HOST:
+      return os << "host";
+    case AddressScope::LINK:
+      return os << "link";
+    case AddressScope::GLOBAL:
+      return os << "global";
+  }
+  return os;
+}
+
+NetworkAddress::NetworkAddress()
+  : m_family(AddressFamily::UNSPECIFIED)
+  , m_flags(0)
+  , m_scope(AddressScope::NOWHERE)
+  , m_prefixLength(0)
+{
+}
+
+std::ostream&
+operator<<(std::ostream& os, const NetworkAddress& addr)
+{
+  return os << addr.getIp() << '/' << static_cast<unsigned int>(addr.getPrefixLength());
+}
+
+} // namespace util
+} // namespace ndn