Written on 17/3/2026

Updated on 19/3/2026

Domain authority: what DA and DR actually measure

Definition

Domain authority is not a Google metric. It's a third-party score calculated by SEO tools (Moz, Ahrefs, Semrush) to estimate the strength of a site's link profile. Useful for comparisons, useless for predictions. In 2026, what really matters is the authority perceived by LLMs, and that can't be reduced to a number.

What is domain authority?

Domain authority is a metric invented by third-party SEO tools, not by Google. Domain Authority (DA) by Moz, Domain Rating (DR) by Ahrefs, and Semrush's equivalent scores are approximations built from publicly crawlable backlink data. Google uses none of these scores in its algorithm. What it uses is its own evaluation of a domain's link profile, history, age, and a hundred other signals. These metrics remain useful, but only for what they actually do: comparing domains against each other on a consistent scale.

How these scores evolve in 2026

DA and DR scales are logarithmic: progressing from 10 to 30 is relatively accessible, while moving from 60 to 70 requires massive link acquisition from highly authoritative sources. These scores fluctuate constantly as each tool's crawl index evolves. A DA drop doesn't necessarily mean a real drop in quality: it may reflect an Ahrefs or Moz index update. In 2026, a new dimension emerges: authority as perceived by LLMs. Domains frequently cited in media, studies, and specialist publications have a stronger presence in models' training corpora. This form of authority can't be measured with a score, it's built through reference content and external mentions.

What we observe at Vydera on how these metrics get used

DA and DR are useful for three specific things: qualifying a backlink opportunity, benchmarking against direct competitors, and prioritizing pages to strengthen in a link audit. They shouldn't be used as goals in themselves. Too often SEO teams set "DR 50" as a KPI without asking what it means concretely for their visibility. A DR of 40 with 20 well-ranked pages is worth more than a DR of 60 with zero qualified traffic.

How to improve domain authority

The levers are the same as for any quality link building:

Create citable reference content: original studies, proprietary data, exhaustive guides.
Work digital PR to earn mentions in high-authority publications.
Identify and repair broken links pointing to your site.
Build editorial partnerships with complementary, non-competing sites.

The fundamental rule remains: authority is earned, not bought sustainably. Mass-purchased links end up detected and devalued.

Sources and references

Go further

Domain authority is one of the indicators we integrate into our SEO/GEO audits. Find our analyses on Vydera Lab or contact us for an audit of your link profile.

Does a high domain authority guarantee good rankings?

No. Domain authority is a contextual factor, not a guarantee. A site with a high DA can be invisible on queries where it has no relevant content. Conversely, a site with a modest DA can rank very well on niche queries with little competition. DA is useful for comparing competitors, not for predicting positions.

Should you worry if your DA drops?

Not necessarily. DA and DR scores fluctuate with tool crawl index updates, independent of your site's actual quality. A DA drop without a drop in traffic or positions is generally not a red flag. However, a drop alongside position losses warrants an investigation of your link profile: lost links, toxic links, disavow opportunities.

What's the difference between DA (Domain Authority) and DR (Domain Rating)?

DA (Domain Authority) is calculated by Moz, DR (Domain Rating) by Ahrefs. Both measure inbound link profile strength, but with different algorithms and distinct crawl data. The same site can have a DA of 35 and a DR of 55: the two scores aren't comparable. Choose one tool as your reference and always compare competitors using the same tool.

Does domain authority influence visibility in LLMs?

Indirectly, yes. LLMs are trained on web data corpora, and high-authority domains are proportionally more present in these corpora. A site frequently cited by media and reference publications has more chance of being integrated into models' knowledge bases. But this form of authority can't be measured with a DA score: it's built through mentions, citations, and editorial links.

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Related terms

SEO

Backlink

A backlink is a hyperlink from an external site pointing to one of your pages. It's one of the most stable ranking factors in Google's history. In 2026, quality far outweighs quantity, and editorial backlinks also play an indirect role in LLM visibility.

SEO

Link building

Link building (or netlinking) is the strategy of acquiring inbound links from third-party sites. It's one of the three pillars of SEO, alongside content and technical. In 2026, backlinks remain a major trust signal for Google, and editorial links also play an indirect role in LLM citability.

SEO

Link juice

Link juice (or link equity) is the SEO value transmitted by a hyperlink from one page to another. It's a metaphor for PageRank: the more authority a page receives from authoritative sources, the more juice it has to redistribute. Optimizing link juice distribution in your architecture is one of the most under-exploited technical SEO levers.