@Override
 public String getToAsString() {
   double to = ((Number) this.to).doubleValue();
   return Double.isInfinite(to) ? null : MAX_IP == to ? null : ValueFormatter.IPv4.format(to);
 }
 @Override
 public String getFromAsString() {
   double from = ((Number) this.from).doubleValue();
   return Double.isInfinite(from) ? null : from == 0 ? null : ValueFormatter.IPv4.format(from);
 }