Domain authority
iop.org domain authority
iop.org has a domain authority score of 69 out of 100 (above average for a business website), based on 33,318 referring domains and a web graph rank of 2,021 among 133 million domains; its traffic rank is Top 100K websites (Chrome).
All metrics for iop.org
| Authority score | 69 / 100 |
|---|---|
| Referring domains | 33,318 |
| Web graph rank (harmonic centrality) | #2,021 (top 0.01%) |
| PageRank position | #2,383 |
| Subdomains seen in the crawl | 144 |
| Majestic Million rank | #721 |
| Majestic referring subnets / IPs | 18,808 / 35,294 |
| Traffic rank | Top 100K websites (Chrome) |
| Position by authority in our top 20,000 | #1,064 |
How the authority score is calculated
The score is the average of two parts, each from 0 to 100:
- Rank part:
100 × (1 − log10(rank) / log10(N))^0.6, where rank is the domain's harmonic centrality position in the Common Crawl web graph (how close it is to every other domain through links) and N is the number of ranked domains (133,241,980). - Link part:
100 × log10(1 + referring domains) / 7, so 10 million referring domains = 100.
For this domain: rank part 73.1 (web graph rank 2,021 of 133,241,980), link part 64.6 (33,318 referring domains), average 68.9, rounded to 69.
It is consistent across all 120 million domains in the data, so it is good for ranking and filtering lists. It is not Moz Domain Authority or Ahrefs Domain Rating. Referring domains count other domains that link to this one, not individual backlinks; no list of linking pages is included.
Domains with a similar authority score
| # | Domain | Authority | Referring domains | Web graph rank | Traffic rank |
|---|---|---|---|---|---|
| 1,060 | insider.com | 69 | 33,762 | 2,443 | not in Chrome's top 1M |
| 1,061 | discogs.com | 69 | 33,718 | 1,681 | Top 1K websites (Chrome) |
| 1,062 | metmuseum.org | 69 | 33,528 | 2,100 | Top 100K websites (Chrome) |
| 1,063 | criteo.com | 69 | 33,453 | 2,122 | Top 50K websites (Chrome) |
| 1,065 | blogspot.fr | 69 | 33,287 | 2,034 | not in Chrome's top 1M |
| 1,066 | ghost.org | 69 | 33,223 | 1,497 | Top 500K websites (Chrome) |
| 1,067 | sketchfab.com | 69 | 33,168 | 2,097 | Top 5K websites (Chrome) |
| 1,068 | xinhuanet.com | 69 | 32,927 | 1,780 | Top 500K websites (Chrome) |
AI crawler policy
AI crawler policy: Open. GPTBot is allowed, ClaudeBot is allowed and PerplexityBot is allowed in its robots.txt (checked 2026-10-02). Does iop.org block GPTBot? →
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FAQ
- What is the domain authority of iop.org?
- iop.org has a domain authority score of 69 out of 100 (above average for a business website), based on 33,318 referring domains and a web graph rank of 2,021 among 133 million domains; its traffic rank is Top 100K websites (Chrome). The score is our own open-data metric (0-100) and is not Moz Domain Authority or Ahrefs Domain Rating.
- How many backlinks does iop.org have?
- iop.org is linked to from 33,318 other domains in the Common Crawl web graph (release cc-main-2026-jul-aug-sep). This counts referring domains, not individual backlinks, and Common Crawl does not see the whole web, so commercial tools that crawl more will show larger numbers.
- How does iop.org rank among all websites?
- Its web graph rank (harmonic centrality) is 2,021 out of 133,241,980 ranked domains, which puts it in the top 0.01%. Its PageRank position is 2,383. Majestic Million ranks it #721.
- Is the iop.org authority score the same as Moz DA or Ahrefs DR?
- No. It is an independent score computed from open data (Common Crawl, Majestic Million, Chrome UX Report). It is consistent across all domains, so it works for comparing and filtering sites, but the numbers will not match the commercial tools.