To modify an address block:
From the Cloud Services Infoblox Portal, click Manage > Configure > Networking >IPAM/DHCP > Address Spaces
Click Click on the IP Space to view the list of address blocks that are associated with it.
Click -> Edit or select Select the respective record address block and click the Edit button to modify an address block.
Modify the details and click Save & Close to save the record address block or click Cancel to cancel.