As promised, I present: Little Fluffy Clouds. It's a command line (and an API!) to combine a list of big, overlapping, adjacent IPv4 or IPv6 networks into a smaller list of networks that contain the exact same set of addresses.
It's ludicrously fast and much more Pythonic than the alternatives I found, like using built-in classes, full typechecking, snake_case names, ruff checking and formatting, etc., etc.
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