Domain authority
lung.org domain authority
lung.org has a domain authority score of 65 out of 100 (above average for a business website), based on 20,392 referring domains and a web graph rank of 5,988 among 133 million domains; its traffic rank is Top 500K websites (Chrome).
All metrics for lung.org
| Authority score | 65 / 100 |
|---|---|
| Referring domains | 20,392 |
| Web graph rank (harmonic centrality) | #5,988 (top 0.01%) |
| PageRank position | #6,287 |
| Subdomains seen in the crawl | 26 |
| Majestic Million rank | #3,041 |
| Majestic referring subnets / IPs | 7,445 / 16,133 |
| Traffic rank | Top 500K websites (Chrome) |
| Position by authority in our top 20,000 | #2,436 |
Top referring domains of lung.org
These are the 10 best-connected websites that link to lung.org in the Common Crawl domain-level web graph (release cc-main-2026-jul-aug-sep, updated quarterly). lung.org has 20,392 referring domains in total; 7,544 of them are among the 5,000,000 best-connected domains of the graph, which are the ones we can list and rank here.
| # | Referring domain | Authority | Traffic rank |
|---|---|---|---|
| 1 | google.com | 98 | Top 1K (Chrome) |
| 2 | wikipedia.org | 91 | Top 1K (Chrome) |
| 3 | amazon.com | 88 | Top 1K (Chrome) |
| 4 | europa.eu | 88 | Top 50K (Chrome) |
| 5 | amazonaws.com | 87 | Top 50K (Chrome) |
| 6 | shopify.com | 87 | Top 1K (Chrome) |
| 7 | blogspot.com | 86 | Top 50K (Chrome) |
| 8 | bit.ly | 86 | Top 1K (Chrome) |
| 9 | github.io | 84 | Top 50K (Chrome) |
| 10 | medium.com | 84 | Top 5K (Chrome) |
Domain-level data: each row is a whole domain that links to lung.org at least once somewhere on its site, not a single backlink or page, and no anchor text or link type is included. Common Crawl samples the public web, so a link can be missing and commercial backlink tools will show more.
Traffic rank of lung.org
lung.org is in Chrome's global Top 500K websites (August 2026), and is listed in 10 countries. Six-month trend: stable: in the same bucket as 6 months ago. In the global top 1M in 12 of the last 12 months.
Top countries
| Country | Chrome rank in that country |
|---|---|
| United States | Top 50K |
| United Kingdom | Top 100K |
| Canada | Top 100K |
| Australia | Top 100K |
| Philippines | Top 100K |
| Ireland | Top 50K |
| New Zealand | Top 50K |
| South Africa | Top 100K |
Last 12 months (global)
| 2025-09 | 2025-10 | 2025-11 | 2025-12 | 2026-01 | 2026-02 | 2026-03 | 2026-04 | 2026-05 | 2026-06 | 2026-07 | 2026-08 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Top 500K | Top 500K | Top 500K | Top 500K | Top 500K | Top 500K | Top 500K | Top 500K | Top 500K | Top 500K | Top 500K | Top 500K |
Source: Chrome UX Report (Google, CC BY 4.0), the monthly popularity lists of origins by real Chrome page loads. A rank is a bucket, not an exact position: "Top 10K" means among the 10,000 most visited origins. It measures reach in Chrome, not visits, so it is not Similarweb traffic. Rank lists by country: Traffic rank by country.
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 68.7 (web graph rank 5,988 of 133,241,980), link part 61.6 (20,392 referring domains), average 65.1, rounded to 65.
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 |
|---|---|---|---|---|---|
| 2,432 | gamblingcommission.gov.uk | 65 | 20,616 | 6,986 | Top 500K websites (Chrome) |
| 2,433 | fourseasons.com | 65 | 20,546 | 6,917 | Top 50K websites (Chrome) |
| 2,434 | nationalacademies.org | 65 | 20,427 | 5,252 | Top 500K websites (Chrome) |
| 2,435 | docomo.ne.jp | 65 | 20,396 | 5,732 | Top 1K websites (Chrome) |
| 2,437 | thekitchn.com | 65 | 20,350 | 7,492 | Top 50K websites (Chrome) |
| 2,438 | mdr.de | 65 | 20,261 | 6,562 | Top 5K websites (Chrome) |
| 2,439 | oxfordjournals.org | 65 | 20,228 | 4,986 | not in Chrome's top 1M |
| 2,440 | parents.com | 65 | 20,222 | 7,364 | Top 50K websites (Chrome) |
Tech stack
lung.org is built with Bootstrap, jQuery, Modernizr, Cloudflare Web Analytics, Mouseflow, Google Tag Manager, cdnjs and Cloudflare and 5 more (detected from the public home page). Full tech stack of lung.org →
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 lung.org block GPTBot? →
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FAQ
- What is the domain authority of lung.org?
- lung.org has a domain authority score of 65 out of 100 (above average for a business website), based on 20,392 referring domains and a web graph rank of 5,988 among 133 million domains; its traffic rank is Top 500K 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 lung.org have?
- lung.org is linked to from 20,392 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 lung.org rank among all websites?
- Its web graph rank (harmonic centrality) is 5,988 out of 133,241,980 ranked domains, which puts it in the top 0.01%. Its PageRank position is 6,287. Majestic Million ranks it #3,041.
- Is the lung.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.
- Which websites link to lung.org?
- The best-connected referring domains of lung.org in the Common Crawl web graph (release cc-main-2026-jul-aug-sep) are google.com, wikipedia.org, amazon.com, europa.eu and amazonaws.com. This is a domain-level list from a quarterly crawl, so it names whole domains that link to lung.org, not individual backlinks, and it is not complete.
- What is the traffic rank of lung.org?
- lung.org is in Chrome's global Top 500K websites in August 2026 (Chrome UX Report, a rank bucket rather than an exact position).