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my @ips = qw(   127.0.0.1
                0.0.0.0
                256.0.0.1
...
    }
    print 'Is', $f ? "" : 'n\'t', " valid and/or usable IP: $ip \n"
}

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Is valid and/or usable IP: 127.0.0.1 
Isn't valid and/or usable IP: 0.0.0.0 
Isn't valid and/or usable IP: 256.0.0.1 
Isn't valid and/or usable IP: 123.555.333.222666