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Who links to zcu.cz?
4,026 domains link to zcu.cz in the latest Common Crawl web graph (Aug-Oct 2026). Below are the 20 strongest. Strength is how many domains link to that referrer.
Common Crawl graph cc-main-2026-aug-sep-oct · read 2026-10-23 · 4,026 referring domains
Strongest referring domains
| # | Referring domain | Domains linking to it |
|---|---|---|
| 1 | google.com | 15,904,056 |
| 2 | apple.com | 2,526,600 |
| 3 | wikipedia.org | 2,226,572 |
| 4 | europa.eu | 1,227,455 |
| 5 | amazonaws.com | 1,047,764 |
| 6 | blogspot.com | 880,829 |
| 7 | github.com | 792,509 |
| 8 | nih.gov | 673,479 |
| 9 | github.io | 464,772 |
| 10 | doi.org | 362,243 |
| 11 | wixsite.com | 340,110 |
| 12 | substack.com | 272,627 |
| 13 | mit.edu | 174,349 |
| 14 | mail.ru | 151,316 |
| 15 | nasa.gov | 135,422 |
| 16 | mdpi.com | 133,989 |
| 17 | frontiersin.org | 127,317 |
| 18 | free.fr | 100,713 |
| 19 | marriott.com | 98,502 |
| 20 | livejournal.com | 86,935 |
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Method and limits
Source: Common Crawl's public domain web graph, built from three monthly crawls (134,979,706 domains, 1,817,202,146 links). We count distinct linking domains, not pages, and do not use any third-party backlink index. Common Crawl samples the web, so counts are lower than a full index such as Ahrefs or Semrush; use them to compare sites and spot big referrers, not as an exact total. Updated each quarter, last graph: cc-main-2026-aug-sep-oct. Nofollow and link position are not in this data. Adult-content domains are left out of the list, so a page can show fewer than 20. Spam and link-network domains are shown as they are.
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