Domain authority
port.ac.uk domain authority
port.ac.uk has a domain authority score of 62 out of 100 (above average for a business website), based on 5,378 referring domains and a web graph rank of 4,509 among 133 million domains; its traffic rank is Top 500K websites (Chrome).
All metrics for port.ac.uk
| Authority score | 62 / 100 |
|---|---|
| Referring domains | 5,378 |
| Web graph rank (harmonic centrality) | #4,509 (top 0.01%) |
| PageRank position | #17,444 |
| Subdomains seen in the crawl | 242 |
| Majestic Million rank | #6,240 |
| Majestic referring subnets / IPs | 4,611 / 8,197 |
| Traffic rank | Top 500K websites (Chrome) |
| Position by authority in our top 20,000 | #5,472 |
Top referring domains of port.ac.uk
These are the 10 best-connected websites that link to port.ac.uk in the Common Crawl domain-level web graph (release cc-main-2026-jul-aug-sep, updated quarterly). port.ac.uk has 5,378 referring domains in total; 3,021 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 | apple.com | 91 | Top 1K (Chrome) |
| 3 | wikipedia.org | 91 | Top 1K (Chrome) |
| 4 | whatsapp.com | 90 | Top 1K (Chrome) |
| 5 | github.com | 87 | Top 1K (Chrome) |
| 6 | europa.eu | 88 | Top 50K (Chrome) |
| 7 | amazonaws.com | 87 | Top 50K (Chrome) |
| 8 | shopify.com | 87 | Top 1K (Chrome) |
| 9 | blogspot.com | 86 | Top 50K (Chrome) |
| 10 | github.io | 84 | Top 50K (Chrome) |
Domain-level data: each row is a whole domain that links to port.ac.uk 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 port.ac.uk
port.ac.uk 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 Kingdom | Top 50K |
| Pakistan | Top 50K |
| Bangladesh | Top 50K |
| Ghana | Top 10K |
| Portugal | Top 50K |
| Nigeria | Top 50K |
| United Arab Emirates | Top 50K |
| Malawi | Top 5K |
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 69.9 (web graph rank 4,509 of 133,241,980), link part 53.3 (5,378 referring domains), average 61.6, rounded to 62.
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 |
|---|---|---|---|---|---|
| 5,468 | physicsworld.com | 62 | 5,408 | 4,174 | Top 500K websites (Chrome) |
| 5,469 | kodak.com | 62 | 5,401 | 4,219 | Top 500K websites (Chrome) |
| 5,470 | hmrc.gov.uk | 62 | 5,396 | 4,235 | Top 100K websites (Chrome) |
| 5,471 | admitad.com | 62 | 5,389 | 4,571 | Top 100K websites (Chrome) |
| 5,473 | avid.com | 62 | 5,346 | 3,151 | Top 500K websites (Chrome) |
| 5,474 | gentoo.org | 62 | 5,334 | 2,930 | Top 1M websites (Chrome) |
| 5,475 | hktdc.com | 62 | 5,324 | 3,525 | Top 50K websites (Chrome) |
| 5,476 | jamendo.com | 62 | 5,320 | 4,257 | Top 500K websites (Chrome) |
Compare and browse
FAQ
- What is the domain authority of port.ac.uk?
- port.ac.uk has a domain authority score of 62 out of 100 (above average for a business website), based on 5,378 referring domains and a web graph rank of 4,509 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 port.ac.uk have?
- port.ac.uk is linked to from 5,378 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 port.ac.uk rank among all websites?
- Its web graph rank (harmonic centrality) is 4,509 out of 133,241,980 ranked domains, which puts it in the top 0.01%. Its PageRank position is 17,444. Majestic Million ranks it #6,240.
- Is the port.ac.uk 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 port.ac.uk?
- The best-connected referring domains of port.ac.uk in the Common Crawl web graph (release cc-main-2026-jul-aug-sep) are google.com, apple.com, wikipedia.org, whatsapp.com and github.com. This is a domain-level list from a quarterly crawl, so it names whole domains that link to port.ac.uk, not individual backlinks, and it is not complete.
- What is the traffic rank of port.ac.uk?
- port.ac.uk is in Chrome's global Top 500K websites in August 2026 (Chrome UX Report, a rank bucket rather than an exact position).