boolean isIPv4Address(String inputString) {

    String[] check = inputString.split(Pattern.quote("."));

    if(check.length == 4) {

        for(int i = 0; i < check.length; i++) {

            if(check[i].length() > 0 && check[i].matches("[0-9]{1,3}") && (Integer.parseInt(check[i]) > 255 || Integer.parseInt(check[i]) < 0)) {

                return false;
            }
        }
        return true;
    }
     return false;
}