If you want to check a company's CIN, you need to visit the official website of the Ministry of Corporate Affairs (MCA). Here, you have to click on the ‘MCA Services' tab and then select the ‘Check CIN' option from the drop-down list under the ‘Company Services' option. You can type the company name, enter the captcha code, and click on the ‘Search' button to find the company's CIN.