Start by signing up for an IP2Whois account if you haven't already. Obtain your API key from the IP2Whois dashboard. This key will allow you to authenticate and access the data programmatically. Make sure to read the API documentation to understand endpoints and request formats.

On your local machine or server, ensure you have the necessary libraries installed for making HTTP requests and handling data. For example, if you're using Python, you'll need libraries like `requests` for API calls and `boto3` for interacting with AWS S3. You can install these using pip:
```bash
pip install requests boto3
```

Write a script to fetch data from IP2Whois using their API. Use the `requests` library to make GET requests to the desired endpoint, passing your API key in the headers. Parse the response and store it in a suitable format (e.g., JSON or CSV).

```python
import requests

api_key = 'your_ip2whois_api_key'
query_url = 'https://api.ip2whois.com/v2?key={}&ip=8.8.8.8'.format(api_key)

response = requests.get(query_url)
ip_data = response.json()
```

Process the fetched data into a format suitable for uploading to S3. If the data is in JSON and needs to be stored as a CSV in S3, convert it accordingly. This may involve iterating over JSON objects and writing them into a CSV file using Python’s `csv` module.

```python
import csv

with open('data.csv', mode='w', newline='') as file:
writer = csv.writer(file)
# Write headers
writer.writerow(['IP', 'Country', 'ISP', 'Organization'])
# Write data
writer.writerow([ip_data['ip'], ip_data['country'], ip_data['isp'], ip_data['organization']])
```

Ensure you have configured AWS credentials on your machine so that `boto3` can access your S3 buckets. You can do this by creating a file named `credentials` in the `.aws` folder within your home directory, or by using the AWS CLI to configure credentials:
```bash
aws configure
```

Use the `boto3` library to upload the formatted file to your S3 bucket. Specify the bucket name and the key (file name in S3). Make sure your IAM user has the necessary permissions to write to the bucket.

```python
import boto3

s3 = boto3.client('s3')
bucket_name = 'your-s3-bucket-name'
file_name = 'data.csv'
s3.upload_file(file_name, bucket_name, file_name)
```

To ensure the data was uploaded successfully, you can list the contents of the bucket or directly access the file via the AWS Management Console. You can also use `boto3` to list objects in the bucket programmatically.

```python
response = s3.list_objects_v2(Bucket=bucket_name)
for obj in response.get('Contents', []):
print(obj['Key'])
```

By following these steps, you can effectively move data from IP2Whois into an S3 bucket using direct API calls and AWS SDKs, without relying on third-party connectors or integrations.