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Who links to ptb.de?
2,538 domains link to ptb.de 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 · 2,538 referring domains
Strongest referring domains
| # | Referring domain | Domains linking to it |
|---|---|---|
| 1 | wikipedia.org | 2,226,572 |
| 2 | europa.eu | 1,227,455 |
| 3 | blogspot.com | 880,829 |
| 4 | github.com | 792,509 |
| 5 | nih.gov | 673,479 |
| 6 | github.io | 464,772 |
| 7 | doi.org | 362,243 |
| 8 | linktr.ee | 271,096 |
| 9 | harvard.edu | 268,680 |
| 10 | bund.de | 240,091 |
| 11 | wiley.com | 229,204 |
| 12 | ca.gov | 196,989 |
| 13 | stanford.edu | 172,882 |
| 14 | mdpi.com | 133,989 |
| 15 | latimes.com | 128,466 |
| 16 | frontiersin.org | 127,317 |
| 17 | admin.ch | 107,994 |
| 18 | free.fr | 100,713 |
| 19 | netlify.app | 91,544 |
| 20 | nist.gov | 83,677 |
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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.
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