Hello. I only have a suggention on the IP matching part. I've always found myself using the below extra-large regexp, courtesy of Mastering Regular Expressions. 
my @ips = qw(   127.0.0.1
                0.0.0.0
                256.0.0.1
                123.555.333.222666  );

foreach my $ip (@ips) {
    my $f = undef;
    if($ip =~ m/^(?!0+\.0+\.0+\.0)
                ([01]?\d\d?|2[0-4]\d|25[0-5])
                \.([01]?\d\d?|2[0-4]\d|25[0-5])
                \.([01]?\d\d?|2[0-4]\d|25[0-5])
                \.([01]?\d\d?|2[0-4]\d|25[0-5])$/x ) {
        $f =1;
    }
    print 'Is', $f ? "" : 'n\'t', " valid and/or usable IP: $ip \n"
}

[download]
When run produces: 
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

[download]
Update: changed code to better illustrate its usefulness.

In reply to Re: Script to input IP Address and Subnet Bits (10.3.2.0/28) by psychotic
in thread Script to input IP Address and Subnet Bits (10.3.2.0/28) by jesuashok

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