When adding or editing a zone, if the resources required to provision the zone are greater than the platform currently has available the zone will first enter the waiting for approval state then, if only a subset of the IP’s requested can be provisioned, it will enter the Partially provisioned state.

Zone partially provisioned

The Network column of the zones list will show you the number of IPs, out of the total requested, that have been provisioned.

Partially provisioned IP count

Should you wish to adjust the number of IPs, please edit this zone.