Fix ReservedAddress checking #14
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Mask was incorrectly calculated.
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Mask was incorrectly calculated.
For example say we are checking for 10.0.0.0/8
we would want to check that the 8 most significant bits match
Before the changes we would end up with: addr & 1111_1111_1111_1111_1111_1111_0000_0000 which is incorrect
With the changes we end up with: addr & 1111_1111_0000_0000_0000_0000_0000_0000 which is correct