[Rdo-list] How to specify range of IP addresses for Nova

I am trying to provide a set of pre-defined network IP addresses given to me in order to create a floating IP range for the instances/VMs. The following command creates a set of IP addresses; however, when I list the floating IP addresses after running this command "# nova-manage floating list", it creates IP addresses that I cannot use. I need to only specify what is available to me and this command doesn't work # nova floating-ip-bulk-create CORRECT-RANGE. Is there are command that I can use to create internal IP addresses of my choice? Thank you, Brian