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Any commands in openstack to determine Free IPs(for IPV6) in a subnet

Hi,

I use the below command, when I want to find out a Free IP in a particular subnet

neutron floatingip-create public
+---------------------+--------------------------------------+
| Field               | Value                                |
+---------------------+--------------------------------------+
| fixed_ip_address    |                                      |
| floating_ip_address | 192.168.100.20                       |
| floating_network_id | 7a03e6bc-234d-402b-9fb2-0af06c85a8a3 |
| id                  | 9d7e2603482d                         |
| port_id             |                                      |
| router_id           |                                      |
| status              | ACTIVE                               |
| tenant_id           | 9e67d44eab334f07bf82fa1b17d824b6     |
+---------------------+--------------------------------------+

This helps me to find which IP is not in use and could be used

Is there any particular openstack command to check IPV6 addresses which are free in a particular subnet? If no command, any shortcuts to determine IP6 addresses are free? (other than ping6)

Thanks