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Change cidr mask on existing network? (add fixed ips)

Hi,

I'm running Openstack Juno version with nova-network

> nova network-list 
+--------------------------------------+----------+---------------+
| ID                                   | Label    | Cidr          |
+--------------------------------------+----------+---------------+
| b8304c38-ee55-452b-821e-d96a0a4ccccc | demo-net | 172.16.0.0/29 |
+--------------------------------------+----------+---------------+

The problem with this Cidr mask 172.16.0.0/29 is that only has 8 IPs and 6 of them are already being used for admin purposes so my question is how can I update this record to add more fixed IPs?

Thanks in advance,