Russell Alsbury answered 12/1/2011 How Do I Find Out If My Cna License Is Still Valid? I Don't Have The License Number. I Heard You Can Get This Info. Right Away On The Internet. Please Help. Dhssweb02.dhss.mo.gov/cnaregistry/CNASearch.aspx this is the website to check if you live in the state of Missouri, the Board of Nursing website does not have it for checking a CNA certification.