The data behind OAR
Every score derives from Common Crawl’s public domain-level web graph. This page shows which release the site is on right now and how to reproduce any number.
The dataset
Common Crawl publishes a domain-level web graph roughly monthly; each release is built from about three months of crawling and lists over 120 million registrable domains, each with a harmonic-centrality rank and a PageRank rank. domainrating.org ingests each new release once and re-scores every known domain against it.
Current release
- Release: cc-main-2026-apr-may-jun
- Ingested: Jul 10, 2026
- Domains scored in this release: 0
The score curve
OAR is logarithmic in graph rank, because authority on the web is roughly power-law distributed. Reference points for a release of about 121 million domains, with both ranks equal:
| Rank in the graph | OAR |
|---|---|
| 1 | 100 |
| 10 | 88 |
| 100 | 75 |
| 1,000 | 63 |
| 10,000 | 51 |
| 100,000 | 38 |
| 1,000,000 | 26 |
| 10,000,000 | 13 |
| N/2 (median domain) | 4 |
| N (last domain) | 0 |
The full method — the exact formula, the weights, and the honesty rules for missing data — is on the methodology page.
Reproducing a score
- Download the release’s domain-ranks file from commoncrawl.org (about 2.4 GB compressed).
- Find the domain’s harmonic-centrality rank and PageRank rank in the file.
- Apply the published v1 formula to the two ranks. The result matches the number on this site.
Access
For single domains: the domain page, the embeddable badge, or the public JSON API — no key required:
GET https://domainrating.org/api/v1/domains/{domain}
The response carries the score, both ranks, the release it was computed from, and the honest data-sufficiency flag. Responses are cached and per-IP rate limits apply; the API is meant for looking domains up, not for harvesting.
{ "domain": "example.com", "oar": 72, "dataSufficient": true, "hcRank": 12345, "prRank": 23456, "crawlRelease": "cc-main-2026-apr-may-jun", "lastComputedAt": "…", "verified": false }
For bulk analysis, go to the source: Common Crawl’s files are public and free, and the formula is published.
License
The scores are open data, dedicated to the public domain under CC0 1.0. Use them for anything; attribution is appreciated but not required.
Attribution and independence
The underlying graph data is © Common Crawl and provided under its own terms of use. domainrating.org is not affiliated with, endorsed by, or connected to Common Crawl.