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use strict;

...
        return ( $bitand ? 0 : 1);
    }
}

field1 10.1.253.11  0.0.0.0
field1 10.1.254.0  0.0.0.64
...
field1 10.1.158.0  15.255.0.255
field1 10.1.160.0  0.0.0.37
field1 10.1.161.0  0.0.146.255

Checking mask 0.0.0.0
        octets array is 0 0 0 0
...
        checking octet 63
                Unequal: oc is 63, flagvalue is 255
Mask is 0