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Fabulous tool when I use to think i use to manually do those substractions

https://pypi.org/project/netcalc/

example :
netcalc sub 192.0.2.0/24 192.0.2.0/28
192.0.2.16/28
192.0.2.32/27
192.0.2.64/26
192.0.2.128/25

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