diff --git a/nova/network/neutron.py b/nova/network/neutron.py
index 0cfbe4b4a31d..980002626224 100644
--- a/nova/network/neutron.py
+++ b/nova/network/neutron.py
@@ -2645,16 +2645,13 @@ class API(base.Base):
 
         # retrieve and cache the network details now since many callers need
         # the network name which isn't present in the response from neutron
-        networks = {}
+        networks = {net['id']: net for net in self._get_available_networks(
+            context, project_id, [fip['floating_network_id'] for fip in fips],
+            client)}
         for fip in fips:
             network_uuid = fip['floating_network_id']
             if network_uuid not in networks:
-                try:
-                    network = client.show_network(network_uuid)['network']
-                except neutron_client_exc.NetworkNotFoundClient:
-                    raise exception.NetworkNotFound(network_id=network_uuid)
-
-                networks[network['id']] = network
+                raise exception.NetworkNotFound(network_id=network_uuid)
 
             fip['network_details'] = networks[network_uuid]
 
diff --git a/nova/tests/unit/network/test_neutron.py b/nova/tests/unit/network/test_neutron.py
index b1ea2907cf32..a7e361a8e9d5 100644
--- a/nova/tests/unit/network/test_neutron.py
+++ b/nova/tests/unit/network/test_neutron.py
@@ -5398,10 +5398,12 @@ class TestAPI(TestAPIBase):
                 }
             ]
         }
-        mock_nc.show_network.return_value = {
-            'network': {
-                'id': uuids.fip_net_id,
-            },
+        mock_nc.list_networks.return_value = {
+            'networks': [
+                {
+                    'id': uuids.fip_net_id,
+                },
+            ],
         }
         mock_nc.list_ports.return_value = {
             'ports': [
@@ -5418,6 +5420,8 @@ class TestAPI(TestAPIBase):
 
         fips = self.api.get_floating_ips_by_project(self.context)
 
+        mock_nc.list_networks.assert_called_once_with(
+            id=[uuids.fip_net_id])
         self.assertEqual(1, len(fips))
 
         if fip_ext_enabled: