To check the Domain Authority (DA) history, you can use several online tools that track and report on domain metrics over time. One of the most reliable sources is Moz's Link Explorer. Simply enter the domain you're interested in, and it will provide a comprehensive DA history along with other valuable insights.

For a deeper understanding and practical tips on using these tools, I recommend reading articles on SEO forums or blogs. For instance, The Ardor has an excellent guide on tracking DA changes and understanding their implications for your website's SEO strategy. Their insights can help you make more informed decisions to improve your site's authority and visibility.