IPAM currently lacks the possibility to display all unallocated subnet space part of a supernet. This is very useful when allocating subnets rather than individual IP addresses.
To illustrate:
This is something that I wrote in ASP that connects to IPAM's DB and finds all subnets not allocated from the 10.68.0.0 supernet along with the maximum subnet size (in the example above a subnet or more that add up to a maximum of 124 hosts are available starting at 10.68.18.4). The links for allocated subnets point Manage Subnets and the ones marked as 'Free space' point to the Add subnet wizard. Having something similar out of the box in IPAM would be great.
