Define IP space use statistics to keep track of the amount of space available in your block.
As your networks grow and become complex, you might want to set Address Manager to view overall block use in the configuration so you can more easily determine which blocks have available network space that can be used.
You can display your block use either by IP allocation or network allocation within a block.
For example, if you display the block use by IP allocation in the block, the use statistics bar in the IP block details or list page displays the percentage of the used and available block space based on the allocated IP addresses in the selected block. This gives you an idea of how many of the total IP addresses under the selected block are being used. However, this won't indicate where in the specific network these IP addresses reside and how much block space can be used to create networks.
If you display the block use by network allocation in the block, the use statistics bar in the IP block details or list page displays the percentage of the used and available block space based on the network sizes that reside within the block. This gives you an idea of how much of the total block space is being used so you can determine which block you can create a network in.
To define IP Space statistic settings: