diff --git a/oslo_serialization/jsonutils.py b/oslo_serialization/jsonutils.py
index 7df6496..9659563 100644
--- a/oslo_serialization/jsonutils.py
+++ b/oslo_serialization/jsonutils.py
@@ -112,7 +112,7 @@ def to_primitive(value, convert_instances=False, convert_datetime=True,
     if isinstance(value, uuid.UUID):
         return six.text_type(value)
 
-    if netaddr and isinstance(value, netaddr.IPAddress):
+    if netaddr and isinstance(value, (netaddr.IPAddress, netaddr.IPNetwork)):
         return six.text_type(value)
 
     if ipaddress and isinstance(value,
diff --git a/oslo_serialization/tests/test_jsonutils.py b/oslo_serialization/tests/test_jsonutils.py
index f649db3..9eb3c25 100644
--- a/oslo_serialization/tests/test_jsonutils.py
+++ b/oslo_serialization/tests/test_jsonutils.py
@@ -320,6 +320,11 @@ class ToPrimitiveTestCase(test_base.BaseTestCase):
         ret = jsonutils.to_primitive(thing)
         self.assertEqual({'ip_addr': '2001:db8::'}, ret)
 
+    def test_ipnet_using_netaddr(self):
+        thing = {'ip_net': netaddr.IPNetwork('1.2.3.0/24')}
+        ret = jsonutils.to_primitive(thing)
+        self.assertEqual({'ip_net': '1.2.3.0/24'}, ret)
+
     def test_message_with_param(self):
         msg = self.trans_fixture.lazy('A message with param: %s')
         msg = msg % 'test_domain'