Below is the subscript of my actual code, $fk is not getting the correct value it seems, though $MYIP1[0] is getting the desired IP. 
open(F,'C:\Temp\ipconfig.txt') || die "error($!)";
while(<F>)
    {
    if(/IP Address/)
        {
        @split0= split(/ /, $_);
         @MYIP0=(@MYIP0,@split0);
        }

    if(/Gateway/)
        {
        @split1=split(/ /, $_);
        @MYGATEWAY0=(@MYGATEWAY0,@split1);
        }
    $i++;
    }
foreach(@MYIP0)
{
if(/\b\d*\.\d*\.\d*\.\d*/)
        {
        @MYIP1=(@MYIP1, $_);
        }

}    
foreach(@MYGATEWAY0)
{
if(/\b\d*\.\d*\.\d*\.\d*/)
        {
        @MYGATEWAY1=(@MYGATEWAY1, $_);
        }

}
    
my $ff="$MYIP1[0]"; 
my $fk="$ff:255.255.255.0";
$block4 = new2 Net::Netmask($fk);
print $block4->size();

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however when i manually assign IP to $ff, it works 
my $ff="10.6.10.5"; 
my $fk="$ff:255.255.255.0";
$block4 = new2 Net::Netmask($fk);
print $block4->size();

[download]

In reply to Net::Netmask not working with scalar variable by sagarkha

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