Need API that can show the unused ip address in a IP pool range.
I think that You should talk with someone from Neutron's Drivers team to make it triagged and then discuss it on drivers team meeting. Probably some specs will be necessary also for that.
Are you describing this implemented API: https://developer.openstack.org/api-ref/network/v2/index.html#network-ip-availability-and-usage-stats
please answer Sam Morrison's question.
[Expired for neutron because there has been no activity for 60 days.]
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I think that You should talk with someone from Neutron's Drivers team to make it triagged and then discuss it on drivers team meeting.
Probably some specs will be necessary also for that.