1. First, you need to know the contract address of the contract you are interested in. The contract address is the unique identifier of the contract published on the Ethereum.

2. Secondly, use the Ethereum Block Browser to query the whitelist information of the contract. Ethereum Block Browser is a tool to view the details of Ethereum transactions and contracts.

3. Then, open the website of any Ethereum block browser, paste the contract address into the search box of the website, and search.

Finally, on the search results page, you can find all kinds of information about the contract address.