if (i < len && data[i] == '.') {
                    dots++;
                    i++;
                }
            }
        }

        return false;
    }

    static boolean isAllDigits(final String hostname) {
        for (int i = 0; i < hostname.length(); i++) {
            if (!Character.isDigit(hostname.charAt(i))) {
                return false;
            }
        }
        return true;

            log.warn("Thread join interrupted", e);
            // Restore interrupted status
            Thread.currentThread().interrupt();
        }
    }

    private static boolean isAllDigits(final String hostname) {
        for (int i = 0; i < hostname.length(); i++) {
            if (!Character.isDigit(hostname.charAt(i))) {
                return false;
            }
        }
        return true;