Optimize your content: Creating high-quality, informative, and engaging content that is optimized for search engines can help your website rank higher in search results, which can lead to an increase in DA.Improve website structure: A well-structured website with a clear hierarchy, easy navigation, and a clean design can help improve your website's DA.Building high-quality, relevant backlinks from authoritative websites is one of the best ways to improve your website's DA. Build high-quality backlinks: The number and quality of links pointing to a website are a major factor in determining DA.There are several ways to increase the domain authority (DA) of a website with SEO: It's important to keep in mind that DA is not the only metric to take into account when evaluating a website's search engine performance, it's important to look at other factors such as backlinks, website structure, and content quality too.

Programmatically by using APIs from Moz, Ahrefs and SEOmator to get the score for a website.

Use a paid SEO tool such as Ahrefs, SEOmator, SEMrush or Majestic which will give you more detailed information about the website and other metrics.

This extension allows you to see the DA score of any website you visit, as well as other metrics like PA and the number of backlinks.

Use a browser extension such as MozBar, which is a free toolbar that you can add to your web browser.Use a free online tool such as SEOmator Domain Authority Checker: This tool allows you to enter a website's URL and see its DA score, as well as other metrics such as page authority (PA) and the number of backlinks.There are a few ways to check the domain authority (DA) of a website for SEO purposes:

Ahrefs website authority checker