Domain authority
pressbooks.com domain authority
pressbooks.com has a domain authority score of 56 out of 100 (moderate), based on 1,502 referring domains and a web graph rank of 7,869 among 133 million domains.
56 / 100
1,502
referring domains (backlinks from other domains)
#7,869
web graph rank of 133,241,980 domains
–
not in Chrome's top 1M
All metrics for pressbooks.com
| Authority score | 56 / 100 |
|---|---|
| Referring domains | 1,502 |
| Web graph rank (harmonic centrality) | #7,869 (top 0.01%) |
| PageRank position | #35,048 |
| Subdomains seen in the crawl | 533 |
| Majestic Million rank | #39,644 |
| Majestic referring subnets / IPs | 1,517 / 3,385 |
| Traffic rank | not in Chrome's top 1M |
| Position by authority in our top 20,000 | #17,198 |
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 67.6 (web graph rank 7,869 of 133,241,980), link part 45.4 (1,502 referring domains), average 56.5, rounded to 56.
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 |
|---|---|---|---|---|---|
| 17,194 | streamelements.com | 56 | 1,508 | 8,732 | Top 50K websites (Chrome) |
| 17,195 | verizonenterprise.com | 56 | 1,508 | 8,955 | not in Chrome's top 1M |
| 17,196 | greenwichmeantime.com | 56 | 1,507 | 8,905 | Top 1M websites (Chrome) |
| 17,197 | ere.net | 56 | 1,504 | 9,121 | not in Chrome's top 1M |
| 17,199 | chamberofcommerce.org | 56 | 1,502 | 9,215 | not in Chrome's top 1M |
| 17,200 | theodi.org | 56 | 1,496 | 12,029 | not in Chrome's top 1M |
| 17,201 | e-disclosure.ru | 56 | 1,490 | 8,527 | Top 500K websites (Chrome) |
| 17,202 | gitorious.org | 56 | 1,490 | 9,426 | not in Chrome's top 1M |
Compare and browse
FAQ
- What is the domain authority of pressbooks.com?
- pressbooks.com has a domain authority score of 56 out of 100 (moderate), based on 1,502 referring domains and a web graph rank of 7,869 among 133 million domains. The score is our own open-data metric (0-100) and is not Moz Domain Authority or Ahrefs Domain Rating.
- How many backlinks does pressbooks.com have?
- pressbooks.com is linked to from 1,502 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 pressbooks.com rank among all websites?
- Its web graph rank (harmonic centrality) is 7,869 out of 133,241,980 ranked domains, which puts it in the top 0.01%. Its PageRank position is 35,048. Majestic Million ranks it #39,644.
- Is the pressbooks.com 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.