So I can use from the Engineer's Toolset the Subnet tool which very nicely pulls subnets from my routers and exports it wonderfully. But IPAM does not recognize the subnet mask field so I cannot import that way unless I only pull in /24's.
I see there is a text bulk import which will take the slash notation for subnets but I do not have a tool to generate it that way.
I have the engineer's toolset but I do not think anything will generate it in that fashion that I know of.