diff --git a/neutron_lib/api/definitions/__init__.py b/neutron_lib/api/definitions/__init__.py
index 9e1463e43..942b7058d 100644
--- a/neutron_lib/api/definitions/__init__.py
+++ b/neutron_lib/api/definitions/__init__.py
@@ -28,6 +28,7 @@ from neutron_lib.api.definitions import l3
 from neutron_lib.api.definitions import logging
 from neutron_lib.api.definitions import logging_resource
 from neutron_lib.api.definitions import network
+from neutron_lib.api.definitions import network_ip_availability
 from neutron_lib.api.definitions import network_mtu
 from neutron_lib.api.definitions import port
 from neutron_lib.api.definitions import port_security
@@ -59,6 +60,7 @@ _ALL_API_DEFINITIONS = {
     logging,
     logging_resource,
     network,
+    network_ip_availability,
     network_mtu,
     port,
     port_security,
diff --git a/neutron_lib/api/definitions/network_ip_availability.py b/neutron_lib/api/definitions/network_ip_availability.py
new file mode 100644
index 000000000..ba732e701
--- /dev/null
+++ b/neutron_lib/api/definitions/network_ip_availability.py
@@ -0,0 +1,59 @@
+# Copyright 2016 GoDaddy.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+#  implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+
+ALIAS = 'network-ip-availability'
+IS_SHIM_EXTENSION = False
+IS_STANDARD_ATTR_EXTENSION = False
+NAME = 'Network IP Availability'
+API_PREFIX = ''
+DESCRIPTION = 'Provides IP availability data for each network and subnet.'
+UPDATED_TIMESTAMP = '2015-09-24T00:00:00-00:00'
+RESOURCE_NAME = "network_ip_availability"
+RESOURCE_PLURAL = "network_ip_availabilities"
+COLLECTION_NAME = RESOURCE_PLURAL.replace('_', '-')
+RESOURCE_ATTRIBUTE_MAP = {
+    RESOURCE_PLURAL: {
+        'network_id': {
+            'allow_post': False, 'allow_put': False,
+            'is_visible': True
+        },
+        'network_name': {
+            'allow_post': False, 'allow_put': False,
+            'is_visible': True
+        },
+        'tenant_id': {
+            'allow_post': False, 'allow_put': False,
+            'is_visible': True
+        },
+        'total_ips': {
+            'allow_post': False, 'allow_put': False,
+            'is_visible': True
+        },
+        'used_ips': {
+            'allow_post': False, 'allow_put': False,
+            'is_visible': True
+        },
+        'subnet_ip_availability': {
+            'allow_post': False, 'allow_put': False,
+            'is_visible': True
+        }
+        # TODO(wwriverrat) Make composite attribute for subnet_ip_availability
+    }
+}
+SUB_RESOURCE_ATTRIBUTE_MAP = {}
+ACTION_MAP = {}
+REQUIRED_EXTENSIONS = []
+OPTIONAL_EXTENSIONS = []
+ACTION_STATUS = {}
diff --git a/neutron_lib/tests/unit/api/definitions/test_network_ip_availability.py b/neutron_lib/tests/unit/api/definitions/test_network_ip_availability.py
new file mode 100644
index 000000000..496c2e8b8
--- /dev/null
+++ b/neutron_lib/tests/unit/api/definitions/test_network_ip_availability.py
@@ -0,0 +1,22 @@
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from neutron_lib.api.definitions import network_ip_availability
+from neutron_lib.tests.unit.api.definitions import base
+
+
+class NetworkIPAvailabilityDefinitionTestCase(base.DefinitionBaseTestCase):
+    extension_module = network_ip_availability
+    extension_resources = (network_ip_availability.RESOURCE_PLURAL,)
+    extension_attributes = ('total_ips', 'used_ips',
+                            'subnet_ip_availability',
+                            'network_name',)
diff --git a/releasenotes/notes/rehome-netipavail-apidef-d03558ac48b71333.yaml b/releasenotes/notes/rehome-netipavail-apidef-d03558ac48b71333.yaml
new file mode 100644
index 000000000..d12fa912c
--- /dev/null
+++ b/releasenotes/notes/rehome-netipavail-apidef-d03558ac48b71333.yaml
@@ -0,0 +1,4 @@
+---
+features:
+  - The ``network-ip-availability`` extension's API definition is now available
+    in ``neutron_lib.api.definitions.network_ip_availability``.