What Is Domain Authority (DA vs DR)?
Abbreviation: DAAlso known as: DA, Domain Rating, DR, Authority Score
Domain Authority (DA) is a third-party metric created by Moz, scored 1-100, that estimates how likely a domain is to rank in search results relative to other domains. It is not a Google ranking factor.
Last reviewed: 2 August 2026 · Reviewed by iNet Ventures Link Building Team
In plain English
Think of DA as one company's guess at how strong your site's backlink profile is, benchmarked against every other site in its index. Ahrefs has its own version called Domain Rating (DR), Semrush calls its version Authority Score, and Majestic has Trust Flow and Citation Flow. They all try to answer a similar question using different data and different maths, which is exactly why the same website can show a DA of 40 in Moz and a DR of 65 in Ahrefs at the same time. Neither number is wrong — they are simply different tools measuring different things.
Technical definition
Domain Authority is a machine learning model trained by Moz to predict SERP position based on link signals within Moz's own crawl index, including linking root domains, MozRank, MozTrust and Spam Score, scored on a logarithmic 1-100 scale and updated roughly monthly. Ahrefs' Domain Rating, by contrast, is a PageRank-style iterative algorithm that considers only dofollow links from unique referring domains, weighted by the DR of the linking domain and divided by how many other domains that page links out to, updated continuously as Ahrefs crawls the web. Neither metric is used by Google's own ranking systems.
Quick example
A prospecting spreadsheet shows a site at DA 52 in Moz but DR 68 in Ahrefs. Both numbers can be correct at once, because DA factors in Moz's prediction of ranking performance while DR looks purely at the backlink graph. Comparing the two directly is the mistake, not the numbers themselves.
Quick facts
| Meaning | A third-party 1-100 score estimating a domain's link-based ranking strength |
|---|---|
| Main category | Link building |
| Used by | SEOs, link building agencies, outreach teams and buyers evaluating linking sites |
| Difficulty | Beginner |
| Importance | Moderate |
| Common examples | Moz Domain Authority, Ahrefs Domain Rating, Semrush Authority Score, Majestic Trust Flow |
| Still relevant? | Yes, as a rough comparative filter — but it should never be the sole factor in deciding whether a link is worth having. |
Why Domain Authority matters
DA and DR are the metrics most commonly quoted in outreach pitches, link marketplaces and prospecting spreadsheets, which makes understanding what they actually measure — and what they do not — essential for anyone buying or evaluating links.
They are the industry's shorthand for authority
Almost every outreach email, link marketplace listing and competitor analysis leads with a DA or DR number, because it is the fastest available proxy for "how strong is this site's backlink profile".
They are not what Google uses
Google has repeatedly and explicitly stated it does not use Domain Authority, Domain Rating, or any comparable third-party metric internally. Whatever internal authority signal Google runs on is proprietary and invisible to every SEO tool.
Cross-tool comparison is where people get it wrong
DA and DR use different link indexes, different crawlers and different models. A site can score very differently across Moz, Ahrefs and Semrush purely because of how each tool measures the web, not because one is more accurate than another.
They are useful for relative, same-tool comparison
Comparing two sites' DR values within Ahrefs, using Ahrefs' own index, is a reasonable way to gauge relative link strength. Comparing one site's Moz DA against another site's Ahrefs DR is not.
They are trivially manipulated
Because DR is derived purely from the link graph with no traffic or spam-quality filter, link networks can inflate it artificially — including through redirect chain tricks. A high score alone tells you almost nothing about a site's real audience or editorial standards.
How it works
DA and DR are calculated in genuinely different ways, which is the root cause of most of the confusion around them.
- 1
Moz builds a training set from real SERPs
Moz trains a machine learning model using around 100 million real search queries and the actual ranking positions, then works out which link-related signals best correlate with ranking well.
- 2
DA blends more than 40 signals
Inputs include linking root domains, MozRank, MozTrust, Spam Score and estimated topical relevance. Because the model is relative to Moz's index, a site's DA can fall even if its own backlink profile improves, if competitors grew faster over the same period.
- 3
Ahrefs runs an iterative PageRank-style calculation
DR looks only at dofollow links from unique referring domains, recursively weighted by the DR of each linking domain, then divided by how many other domains that linking page points to. Nofollow links contribute nothing to DR.
- 4
Both apply logarithmic scaling
Moving from DR 20 to DR 40 is comparatively easy. Moving from DR 80 to DR 90 requires disproportionately more link equity, since both scales compress at the top end.
- 5
Update frequency differs sharply
Ahrefs recalculates DR continuously as its crawler finds new links, often within days. Moz recalculates DA on a roughly monthly cycle, so a newly acquired link will show up in DR long before it moves DA.
Types and variations
DA and DR are the two most quoted authority metrics, but every major SEO tool runs its own version.
Domain Authority (Moz)
Machine learning model trained to predict SERP position. Relative to Moz's own index, factors in Spam Score directly, updates roughly monthly.
Domain Rating (Ahrefs)
Pure backlink-graph strength measured via an iterative, PageRank-style calculation using dofollow links only. Updates continuously, more easily manipulated by link networks since it ignores spam and traffic signals.
Authority Score (Semrush)
A composite score that factors in a linking domain's organic search traffic alongside its backlink profile, on the logic that real organic traffic is harder to fake than raw link counts.
Trust Flow and Citation Flow (Majestic)
Citation Flow measures link volume; Trust Flow measures link quality based on proximity to a curated set of trusted seed sites. Comparing the two flags sites with lots of low-quality links relative to their apparent size.
URL Rating / Page Authority
The page-level equivalent of DR and DA. Matters more for judging an individual link opportunity than the domain-wide score, since a DR 70 site can easily have a UR 5 article buried within it.
Real examples
Where these scores are genuinely useful, and where they mislead people who trust them too literally.
Using DR to shortlist prospects within one tool
An outreach team filters a prospect list to DR 30+ sites in Ahrefs, then manually checks each one for real organic traffic and topical relevance before pitching. DR narrows the list; judgement does the real work.
Comparing a client's Moz DA against a competitor's Ahrefs DR
A report claims a competitor is "stronger" because its Ahrefs DR of 55 beats the client's Moz DA of 48. The comparison is meaningless — different tools, different indexes, different models. It should be DA vs DA or DR vs DR, never mixed.
Buying a link purely because of a high DR
A DR 70 site with almost no organic traffic, no topical relevance to the buyer, and an inflated score from participating in a link network. The number looks impressive; the link itself carries little real value and can carry risk if the network is later caught.
Pairing DR with organic traffic before deciding
A prospect at DR 35 with 20,000 monthly organic visits and clear topical overlap is judged a stronger opportunity than a DR 55 site with negligible traffic. Traffic is a much harder signal to fake than a link-derived score.
Best practices
Treat DA and DR as one filter among several, never as the decision on their own.
What to do
- Keep comparisons within a single tool — DA against DA, DR against DR
- Pair the score with real organic traffic and topical relevance before valuing a link
- Use Spam Score (Moz) or a similar signal to sanity-check inflated DR values
- Check a domain's history where possible — a site that jumped 20 points in a month is worth investigating
- Judge the page-level metric (UR or Page Authority), not just the domain-wide score, for individual link decisions
What to avoid
- Comparing DA and DR as if they were the same scale
- Treating either as a Google ranking factor — neither is used by Google
- Buying links, or judging outreach targets, on score alone
- Assuming a higher number always means a better link
- Reporting DA/DR movement to clients as if it reflects Google performance rather than a third-party estimate
Common mistakes
Treating DA or DR as a Google ranking signal
Google has said clearly, on multiple occasions, that it does not use Domain Authority, Domain Rating or any equivalent third-party metric. They are estimates built by independent companies, not inputs into Google's algorithm.
Comparing scores across different tools
A DR 60 site in Ahrefs and a DA 60 site in Moz are not equivalent. Different indexes and different models mean the same underlying site can post very different numbers in each tool.
Ignoring how easily DR can be manipulated
Because DR looks purely at the backlink graph with no traffic or spam filter, it is the more easily gamed of the two major metrics — link networks and redirect chain tricks can inflate it without any real audience behind the number.
Judging a link opportunity by domain score alone
A high domain-wide score can hide a genuinely weak individual page. Checking the specific linking page's own authority (UR or Page Authority) and topical relevance matters more than the domain average.
Expecting DA to move as fast as DR
Because Moz updates DA roughly monthly while Ahrefs recalculates DR continuously, a new backlink can appear to help DR within days while DA lags behind for weeks. That is a reporting-cadence difference, not a sign either tool is wrong.
Why authority metrics matter differently in 2027
The core caution around DA and DR has not changed: they remain third-party estimates, not Google signals, and cross-tool comparison remains a basic but common error. What has shifted is how heavily the industry leans on them for prospecting at scale, and how much more sophisticated link networks have become at gaming the purely link-derived metrics like DR. The practical response has been a move towards pairing authority scores with independently verifiable signals — organic traffic, topical overlap, and increasingly, whether a source shows up as a citation in AI-generated answers — since none of those can be faked as easily as a backlink count.
- DA and DR remain the industry's shorthand, despite neither being a Google signal
- DR is more easily manipulated than DA because it ignores traffic and spam quality entirely
- Pairing authority scores with real organic traffic has become standard practice for serious prospecting
- Citation in AI-generated answers is emerging as a parallel credibility signal that is harder to fake
- The underlying caution — do not treat any third-party score as a Google ranking factor — has not changed at all
How iNet Ventures approaches domain authority
We use DR and DA constantly for prospecting, so it is worth being direct about their limits. We treat both as a first-pass filter, never the final word on whether a placement is worth pursuing.
Filter, then verify
Prospect lists are filtered by DR within Ahrefs for consistency, then every shortlisted site is checked individually for organic traffic, topical relevance and editorial standards before it enters a campaign.
Cross-check for inflation
Sites with an unusually high DR relative to their visible traffic or content quality are flagged and typically excluded, since that pattern is a common footprint of participation in a link network.
Report the real numbers, labelled honestly
Clients receive the specific tool and metric used for any authority figure quoted, alongside the linking page's organic traffic, rather than a single unlabelled score.
Continue learning
Free Backlink Analyzer
Check any domain's backlink profile and referring domains.
Domain Authority Checker
Look up DA for any domain in seconds.
Spam Score Checker
Screen prospective linking domains for spam risk before you commit.
Blogger Outreach
Editorial placements on sites vetted for real audiences, not just scores.
Frequently asked questions
What is a good Domain Authority score?
There is no universal good score — it depends entirely on the competitiveness of your niche and what your realistic competitors score. A DA of 30-40 might be strong for a new local business site and unremarkable for an established publisher. Compare against your actual competitors within the same tool, not against an arbitrary benchmark.
Why is my Domain Rating different from my Domain Authority?
They are calculated by different companies using different link indexes and different models. Ahrefs' DR looks purely at dofollow links between unique referring domains. Moz's DA is a machine learning model trained on real SERP data that also factors in Spam Score and other signals. It is normal, not a sign of an error, for the two figures to differ by 10-15 points or more on the same site.
Does Google use Domain Authority or Domain Rating?
No. Google has stated repeatedly that it does not use Moz's Domain Authority, Ahrefs' Domain Rating, or any comparable third-party metric in its ranking systems. Whatever internal authority signal Google actually uses is proprietary and not visible in any SEO tool.
Can I increase my Domain Authority quickly?
Not reliably or safely. Both DA and DR respond to a genuinely growing, high-quality backlink profile over time. Schemes that promise a fast score increase, typically through link networks or bulk low-quality links, tend to inflate the number without building anything of real value, and can carry risk if the sites involved are later penalised.
Is Domain Rating easier to manipulate than Domain Authority?
Generally yes. DR is derived purely from the backlink graph with no traffic or spam-quality filter, so link networks can inflate it directly. DA factors in Spam Score and other signals that make manipulation somewhat harder, though neither metric is immune to it.
Written using Moz's and Ahrefs' own published documentation on how DA and DR are calculated, cross-checked against multiple independent comparison analyses. Statements about what Google does or does not use are based on Google's own public statements, not third-party speculation.
- Written by:
- iNet Ventures Editorial Team
- Reviewed by:
- iNet Ventures Link Building Team
- Published:
- 2 August 2026
- Last reviewed:
- 2 August 2026
Sources and further reading
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