Before initiating the data transfer, familiarize yourself with the data structure provided by IP2WHOIS. Typically, IP2WHOIS data is available in various formats such as JSON or CSV. Identify the fields and data types you need to export for compatibility with DuckDB.

Log in to your IP2WHOIS account and navigate to the data export section. Choose the format that best suits your needs, preferably CSV or JSON, as these are straightforward to work with. Download the data to your local machine, ensuring it's complete and accurate.

Set up DuckDB on your local machine if you haven't already. You can download the latest version from the official DuckDB website and follow the installation instructions for your operating system. Once installed, launch DuckDB to prepare it for data import.

If your exported data from IP2WHOIS is in JSON format, convert it to CSV for easier ingestion into DuckDB. Use a script or a simple application to read the JSON data and write it to a CSV file, ensuring each field is correctly mapped to a column.

Open DuckDB and create a table that matches the structure of your CSV file. Use the `CREATE TABLE` SQL statement to define the table schema, specifying each column and its data type. Ensure the column names and types align with those in your CSV file to avoid import errors.

```sql
CREATE TABLE ip2whois_data (
ip_address VARCHAR,
country VARCHAR,
region VARCHAR,
city VARCHAR,
isp VARCHAR,
domain VARCHAR,
asn VARCHAR
);
```

Use the `COPY` command in DuckDB to load the CSV data into the table you created. Ensure the CSV file path is correct and accessible. The command will look something like this:

```sql
COPY ip2whois_data FROM '/path/to/your/data.csv' (DELIMITER ',', HEADER TRUE);
```

This command tells DuckDB to read from your CSV file and import the data into the specified table, assuming the first row contains headers.

After importing the data, run some queries in DuckDB to verify that the data has been transferred correctly. Use `SELECT` statements to check the number of rows and some sample data to ensure everything is in order. This step confirms that the data integrity is maintained during the transfer.

```sql
SELECT * FROM ip2whois_data LIMIT 10;
```

By following these steps, you can successfully transfer data from IP2WHOIS to DuckDB without the need for third-party connectors or integrations. Ensure you handle data securely and comply with any relevant data privacy regulations throughout this process.