Domain authorityDA

Does Google use domain authority?#

Google does not use Domain Authority, Domain Rating or any other third-party authority score; Moz, which created DA, says it is not a Google ranking factor and has no effect on search results.

DA is Moz’s model of Google, not part of Google. Moz’s own documentation is explicit: “Domain Authority is not a Google ranking factor and has no effect on the SERPs.” It’s a machine-learning prediction of how likely a site is to rank, built mostly from link data such as the number of linking root domains and the quality of those links.

What Google does use is link analysis. Its ranking systems guide says PageRank “continues to be part of our core ranking systems,” and that “site-wide signals and classifiers” contribute to how it understands pages. That’s why DA often tracks rankings: both sit downstream of the same links. But Google’s systems judge pages against specific queries, from its own index, using far more than links — so a site with a lower score can outrank a higher one on a question it answers better.

Domain Authority vs Domain Rating: what's the difference?#

Domain Authority is Moz’s 1–100 prediction of ranking ability built from link data, while Domain Rating is Ahrefs’ 0–100 measure of backlink-profile strength; Semrush’s Authority Score also blends in organic traffic and spam signals, and Google uses none of the three.

All three are relative. Moz notes that it’s “easier to grow your score from 20 to 30 than it is to grow it from 70 to 80,” and Ahrefs calls DR “a relative metric by definition,” which can fall even when you lose no links because other sites gained more. Scores from different tools aren’t interchangeable, so pick one and compare like with like.

What is a good domain authority score?#

A good domain authority score is one close to the scores of the sites ranking for the queries you want; Moz says there’s no universally good score, because the metric is relative and a 30 can be strong in one niche and weak in another.

1. Pick five queries you want to win. Real buyer questions, not your brand name.
2. Note the DA or DR of every page-one result. Look across the whole top ten, not just the first result.
3. Find the lowest score that ranks. If sites near your score already appear, the query is winnable on content. If every result is 40 points above you, it probably isn’t yet.
4. Re-check every quarter. Scores move as the web’s link graph changes, even when nothing changes on your side.

This is roughly how keyword difficulty scores work under the hood: mostly the link strength of the pages already ranking. The useful question isn’t whether your DA is good, but which questions you can win with the authority you have. For a young site that usually means specific, long-tail questions the big domains answer poorly or not at all.

How do you increase domain authority?#

Domain authority rises when more relevant, established sites link to you, so the durable way to increase it is to earn those links — with content worth citing, digital PR and real relationships — rather than to buy links aimed at the score.

Because DA and DR are computed mostly from linking domains, any tactic that adds linking domains moves them, including tactics that break Google’s rules. That’s why “DA 50+ links” are sold, and why the score alone makes a bad target. Google’s link spam policy covers buying links and exchanging goods or services for them, and its SpamBrain system is built to detect “both sites buying links, and sites used for the purpose of passing outgoing links.” A link Google has neutralized can still lift a third-party score, so a rising DA isn’t proof your links count.

• Publish things worth linking to: original data, useful tools and clear definitions others want to cite. See information gain.
• Run digital PR: give journalists a story or a number they can’t get anywhere else.
• Get listed where you genuinely belong: partner and integration directories, customers’ case studies, industry associations.
• Keep what you’ve earned: redirect old URLs that still attract links, and ask sites that mention you without a link whether they’d add one.

Does domain authority matter for AI search?#

Domain authority matters only weakly for AI search: in Ahrefs’ 75,000-brand study, Domain Rating correlated at 0.27–0.33 with how often ChatGPT, AI Mode and AI Overviews mentioned a brand, while branded web mentions correlated at 0.66–0.71.

AI engines don’t read an authority score either. They retrieve from search indexes — Google’s for AI Overviews and Gemini, Bing plus OpenAI’s own for ChatGPT, Brave for Claude, Perplexity’s own for Perplexity — and links help pages get crawled and rank in those indexes. So authority helps a page become a candidate. Whether the answer names you depends more on what the rest of the web says about you. The AI SEO guides cover each engine’s index in detail.

Ahrefs’ numbers put that in order. Across ChatGPT, AI Mode and AI Overviews, YouTube mentions (about 0.74) and branded web mentions led, branded anchor text came next, and Domain Rating sat in the bottom half. DR’s correlation was highest in AI Overviews, the product built most directly on Google’s rankings. That fits the idea that authority works through search ranking rather than around it.

Related terms#

• Authority & off-siteBacklinksA link from one website to another, which search engines treat as a vote of confidence that passes authority to the page it points to — and the relevance and quality of the linking site matter far more than the number of links.Read the entry
• KDMeasurementKeyword difficultyA third-party estimate, usually on a 0 to 100 scale, of how hard it would be to reach Google’s first page for a query, calculated mostly from the backlink strength of the pages already ranking — useful for choosing winnable topics, but not a Google metric.Read the entry
• Authority & off-siteBrand mentionsAny reference to a brand’s name on another website, forum, review site or video, with or without a link, and in large studies mentions correlate more strongly with visibility in AI answers than backlinks do.Read the entry
• Authority & off-siteAnchor textThe visible, clickable text of a link, which search engines read as a description of the page it points to — so natural, descriptive anchors help, while the same exact-match keyword repeated across many sites looks manipulative.Read the entry
• Authority & off-siteTopical authorityThe degree to which search engines and AI systems treat a site as a reliable source on a whole subject, earned by covering that subject in depth and being referenced for it elsewhere, rather than by ranking for any one keyword.Read the entry
• AI search & GEOAI visibilityA measure of how often, how prominently and how favorably a brand appears in answers from AI systems such as ChatGPT, Perplexity, Gemini and Google AI Overviews for the questions its buyers ask — the AI-search counterpart to search rankings.Read the entry