In most cases, your CNA certification expiration date can be easily obtained online. First access your state's CNA registry page and then choose the certification or license verification page. Enter your personal information in the required fields and submit the data. Your license number, expiration date and status should be displayed as long as all the information you have entered is correct. You can also call the CNA registry of your state. You can find contact information for all CNA registries here or by using the menu available on most pages of this website.