[OT] CIDR Mask calculation

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Not specific to Fedora, but perhaps there are more folks on here that can explain this. I'm trying to figure out the CIDR mask or bits for a particular network. Specifically: 219.128.0.0 - 219.137.255.255

   Now, 219.128.0.0/13 (or 255.248.0.0) gives me a range of
        219.128.0.0 - 219.135.255.255

   And 219.128.0.0/12 (or 255.240.0.0) gives me a range of
       219.128.0.0 - 219.143.255.255

So how do I get the specific range in question (where it ends at 219.137.255.255)

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