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  1. or download this
    perl -e '$ip="192.168.10.2"; $mask="255.255.254.0"; @maskbyte=split /\
    +./,$mask; @ipbyte=split /\./, $ip; for($i=0;$i<4;$i++) { $b1=$maskbyt
    +e[$i]+0; $b2=$ipbyte[$i]+0;$NetByte=$b1&$b2; if($i != 0) {$NetAddr = 
    +$NetAddr . "." . $NetByte; } else { $NetAddr=$NetByte ;}} print "$Net
    +Addr\n";'
    
  2. or download this
    perl -e '$ip="192.168.10.0"; $mask="255.255.254.0"; @maskbyte=split /\
    +./,$mask; @ipbyte=split /\./, $ip; for($i=0;$i<4;$i++) { $b1=$maskbyt
    +e[$i]+0; $b2=$ipbyte[$i]+0;  $NetByte=$b2 || ~$b1 ;  if($i != 0) {$Ne
    +tAddr = $NetAddr . "." . $NetByte; }else { $NetAddr=$NetByte ;}} prin
    +t "$NetAddr\n";'