Adds the IPv4 address range to the relevant existing IPv4 address block. If there is no IPv4 address block existing, then ...

Adds the IPv4 address range to the relevant existing IPv4 address block. If there is no IPv4 address block existing, then the added IPv4 address range would be mapped under Public address space or Private address space and Unmapped address space and it would be mapped to the appropriate IPv4 address block only on  creation of the same.