Begin by exporting the data from IP2WHOIS. Log into your IP2WHOIS account and navigate to the data export section. Choose the data set you wish to export and select a format that Databricks can read, such as CSV or JSON. Save this file to a secure location on your local machine.

Access your Databricks account and set up the environment. If you haven't already, create a new Databricks workspace. Within this workspace, establish a cluster that will be used for processing the data. Ensure that the cluster is running and has access to sufficient resources to handle the incoming data.

Use the Databricks web interface to upload the exported IP2WHOIS data file to the Databricks File System (DBFS). Navigate to the "Data" tab, choose "DBFS," and then click on "Upload" to initiate the file transfer from your local machine to DBFS.

Open a new notebook in your Databricks workspace. Use PySpark or Scala to read the data from the DBFS. For example, if your data is in CSV format, you can use the `spark.read.csv()` function to load it into a DataFrame. Verify that the data is correctly loaded by displaying a few sample rows.

```python
df = spark.read.csv('/dbfs/path/to/your/data.csv', header=True, inferSchema=True)
df.show(5)
```

Perform any necessary data cleaning or transformation within the notebook. This could include handling missing values, renaming columns, or converting data types. Use Spark DataFrame operations to perform these transformations efficiently. Ensure that the data is in the desired format for further processing or analysis.

Once the data is transformed and cleaned, write it to Delta Lake within the Databricks Lakehouse. Delta Lake offers ACID transactions and scalable metadata handling, which are beneficial for data management. Use the `write.format("delta")` function to save the DataFrame as a Delta table.

```python
df.write.format("delta").mode("overwrite").save("/mnt/delta/ip2whois_data")
```

After writing the data to Delta Lake, validate the data to ensure it has been transferred correctly. You can do this by reading the Delta table back into a DataFrame and reviewing a subset of the data. Confirm that all expected records are present and correctly formatted.

```python
delta_df = spark.read.format("delta").load("/mnt/delta/ip2whois_data")
delta_df.show(5)
```

By following these steps, you can successfully move data from IP2WHOIS to Databricks Lakehouse using the built-in capabilities of Databricks, without relying on third-party connectors or integrations.