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Domain authority is a score that estimates how strong a website is in search, based mainly on the quantity and quality of other sites linking to it. It is not a Google metric. Google does not publish a single authority score. It is a third party estimate that the SEO industry uses as a quick proxy for link strength. This tool reports an authority rank on a 0 to 1000 scale, where higher means a stronger link profile.
Alongside the rank, the tool shows two raw numbers that the score is built from: total backlinks, which is the count of individual links pointing at the domain, and referring domains, which is the count of unique websites those links come from. Referring domains is usually the more meaningful of the two, since fifty links from fifty different sites signal far more trust than fifty links from one site.
Authority helps explain why some pages rank despite thin content: a strong domain can rank on trust that weaker sites have not earned. When you check the SERP for a keyword and see high authority domains filling the top spots, that tells you the keyword needs real link building to win, not just better content. Checking your own authority and your competitors' is a fast way to read the playing field.
Just remember the score is an estimate, not a ranking factor Google uses directly. A high number does not guarantee rankings, and a modest number does not block them, especially for low competition keywords where a genuinely better page can win. Use authority to judge link strength and competitive difficulty, not as a target to chase for its own sake.
Enter your domain to see your current authority rank, backlinks and referring domains, then check a few competitors to compare. If their referring domain counts dwarf yours, link building is likely your real bottleneck, not content. If they are close, content and on-page quality are where you can win.
Track the numbers over time rather than fixating on a single reading. Growing referring domains steadily, from relevant and trustworthy sites, is the healthy signal. A sudden spike in backlinks from many low quality domains is a warning sign of spam, not strength, and is worth investigating.
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