You can add a parent block to existing IPv4 blocks in Address Manager.
You can select two or more blocks on the same IPv4 blocks table to be located under a new parent block. The new parent block appears on the IPv4 blocks table where the siblings were selected, and the siblings now appear as children of the new parent block.
Attention: In previous versions of Address Manager, the create parent
block operation was not allowed if an unselected block was present between
the two selected blocks. In Address Manager v25.1, this operation will create a
parent block containing the selected blocks and any unselected blocks within the
range.
To add IPv4 parent blocks: