Determining the authenticity of a website's Domain Authority (DA) can be challenging. DA is a metric indicating a site's authority in search engine results. To assess it, use reputable tools like Moz, Ahrefs, or SEMrush. Evaluate the quality of a site's backlinks, its age, content consistency, and user engagement. Comparing its DA to competitors can reveal anomalies. Remember, DA is just one of many factors influencing search engine rankings. Fake DA may mislead you but won't directly affect your ranking. Concentrate on high-quality backlinks, quality content, and user experience to improve your SEO rather than solely relying on DA.