} else if (hasDot) {
      if (percentIndex != -1) {
        return null; // Scope IDs are not supported for IPV4
      }
      return textToNumericFormatV4(ipString);
    }
    return null;
  }

  @CheckForNull
  private static byte[] textToNumericFormatV4(String ipString) {
    if (IPV4_DELIMITER_MATCHER.countIn(ipString) + 1 != IPV4_PART_COUNT) {
      return null; // Wrong number of parts
    }

    } else if (hasDot) {
      if (percentIndex != -1) {
        return null; // Scope IDs are not supported for IPV4
      }
      return textToNumericFormatV4(ipString);
    }
    return null;
  }

  @CheckForNull
  private static byte[] textToNumericFormatV4(String ipString) {
    if (IPV4_DELIMITER_MATCHER.countIn(ipString) + 1 != IPV4_PART_COUNT) {
      return null; // Wrong number of parts
    }