[OT] CIDR Mask calculation

[Ashley M. Kirchner]

    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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