Network IP Availability is an information-only API extension that
allows a user or process to determine the number of IP addresses that
are consumed across networks and the allocation pools of their subnets.
This extension was added to neutron in the Mitaka release.

This section illustrates how you can get the Network IP address
availability through the command-line interface.

Get Network IP address availability for all IPv4 networks:

$ openstack ip availability list

+--------------------------------------+--------------+-----------+----------+
| Network ID                           | Network Name | Total IPs | Used IPs |
+--------------------------------------+--------------+-----------+----------+
| 363a611a-b08b-4281-b64e-198d90cb94fd | private      |       253 |        3 |
| c92d0605-caf2-4349-b1b8-8d5f9ac91df8 | public       |       253 |        1 |
+--------------------------------------+--------------+-----------+----------+

Get Network IP address availability for all IPv6 networks:

$ openstack ip availability list --ip-version 6

+--------------------------------------+--------------+----------------------+----------+
| Network ID                           | Network Name | Total IPs            | Used IPs |
+--------------------------------------+--------------+----------------------+----------+
| 363a611a-b08b-4281-b64e-198d90cb94fd | private      | 18446744073709551614 |        3 |
| c92d0605-caf2-4349-b1b8-8d5f9ac91df8 | public       | 18446744073709551614 |        1 |
+--------------------------------------+--------------+----------------------+----------+

Get Network IP address availability statistics for a specific
network:

$ openstack ip availability show NETWORKUUID

+------------------------+--------------------------------------------------------------+
| Field                  | Value                                                        |
+------------------------+--------------------------------------------------------------+
| network_id             | 0bf90de6-fc0f-4dba-b80d-96670dfb331a                         |
| network_name           | public                                                       |
| project_id             | 5669caad86a04256994cdf755df4d3c1                             |
| subnet_ip_availability | cidr='192.0.2.224/28', ip_version='4', subnet_id='346806ee-  |
|                        | a53e-44fd-968a-ddb2bcd2ba96', subnet_name='public_subnet',   |
|                        | total_ips='13', used_ips='5'                                 |
| total_ips              | 13                                                           |
| used_ips               | 5                                                            |
+------------------------+--------------------------------------------------------------+