my $i = my $x = (split(/\./, '205.0.0.0'))[0];
my $j = my $y = (split(/\./, '123.0.0.0'))[0];

my $ij = $i & $j;
$x += 0;
$y += 0;
my $xy = $x & $y;

print("$i & $j = $ij\n");  # 205 & 123 = 001
print("$x & $y = $xy\n");  # 205 & 123 = 73