Domain authority, from open data
The Open Authority Rating is a free 0 to 100 score computed from the public Common Crawl web graph. Reproducible by anyone, for any domain in the graph.
Checking a list? Rate up to 10 domains at once.
Free, no account needed. Built on Common Crawl, the same open corpus used in web research.
google.com
Open Authority Ratingcc-main-2026-aug-sep-oct
Scored domains
How the score works
- 01Open source data. Common Crawl publishes a web-scale link graph with every crawl release, free for anyone to verify.
- 02Two graph signals. A domain’s harmonic-centrality and PageRank ranks in that graph combine into a single 0 to 100 score.
- 03Honest gaps. Domains without enough link-graph data show no number. We never estimate a rating.
The full method, formula included, is on the methodology page.
Not DR. Not DA.
OAR is not Ahrefs Domain Rating and not Moz Domain Authority, and it isn’t comparable to them. Those are proprietary scores over private link indexes; OAR is computed from public data with a published method.
| Property | OAR | DR / DA |
|---|---|---|
| Data source | Public Common Crawl graph | Private link indexes |
| Method | Published and versioned | Proprietary |
| Reproducible | Yes, by anyone | No |
| Missing data | Shown as a gap | Not disclosed |
Domain rating questions, answered
What is a domain rating?
A domain rating, also called a domain authority score, is a 0 to 100 number that estimates how strongly a website's domain is connected to the rest of the web through links. Several SEO companies publish their own versions, computed from private link indexes. On domainrating.org the score is the Open Authority Rating (OAR), computed from the public Common Crawl web graph with a published formula, so anyone can reproduce it.
How is the domain rating calculated?
OAR combines two ranks from each Common Crawl web graph release: harmonic centrality, weighted 0.7, and PageRank, weighted 0.3. Each rank is mapped to a logarithmic position, so the few best-linked domains score highest and the long tail decays smoothly, and the result is a number from 0 to 100. The full formula is on the methodology page.
What is a good domain rating?
On OAR’s logarithmic scale the median domain scores in the low single digits, so any score above that means real links. The twenties are a strong small or specialist site, and forty and above is the territory of established brands and publishers. Compare a domain with its real competitors rather than with the biggest sites on the web; what is a good domain authority score explains the ranges.
Is it really free?
Yes. Checking any domain is free without an account; a free account adds a dashboard for tracking domains over time. The data source is open, and so is the method.
Where does the data come from?
The domain-level ranks files that Common Crawl publishes with each crawl release, openly downloadable at commoncrawl.org. The exact formula is on the methodology page.
Is OAR comparable to Ahrefs DR or Moz DA?
No. Those are proprietary scores over private link indexes. OAR is computed from public data with a published formula. The scales look similar (0 to 100) but the numbers mean different things.
How often do scores update?
Common Crawl publishes a new domain graph roughly monthly, each built from about three months of crawling. Every known domain is re-scored automatically when a release lands, and each release becomes one point in the trend.
Why does my domain have no score?
Because it has too little presence in the Common Crawl link graph for an honest number. We show the gap instead of estimating. New or very small domains usually appear in the graph once other sites link to them.
Track your domains across releases
A free account gives you a dashboard with score history, per-release trends, and the change since you started tracking.