Hi, We implemented this scenario for our public cloud: https://docs.openstack.org/neutron/latest/admin/config-dns-int-ext-serv.html... This is currently in production in beta-mode at Infomaniak's public cloud. We did that, because we want our customers to be able to set any domain name or PTR for the IPs they own. However, we discovered that there's no restriction on what zone customers can set. For example, if customer A owns the IP 203.0.113.9, customer B can do "openstack zone create 9.113.0.203.in-addr.arpa.", preventing customer A to set their PTR record. Is there currently a way to fix this? Or maybe a spec to implement the correct restrictions? What is the way to fix this problem in a public cloud env? Cheers, Thomas Goirand (zigo)