---
title: 42a Citation Index
mirror_canonical: https://index.42a.ai/
cited_in_42a: false
---

# 42a Citation Index

42a indexes every URL cited by AI language models (GPT, Claude, Gemini,
Perplexity, and others). Fetch any page at:

```
https://index.42a.ai/<host>/<path>
```

The response is clean, extractable `text/markdown` with YAML frontmatter
linking back to the original source URL.

- [About / takedown](https://index.42a.ai/about)
- [llms.txt](https://index.42a.ai/llms.txt)
- [sitemap.xml](https://index.42a.ai/sitemap.xml)

## Most-indexed domains

- [docs.aws.amazon.com](https://index.42a.ai/docs.aws.amazon.com/) — 88 pages indexed
- [www.youtube.com](https://index.42a.ai/www.youtube.com/) — 75 pages indexed
- [support.google.com](https://index.42a.ai/support.google.com/) — 49 pages indexed
- [developers.google.com](https://index.42a.ai/developers.google.com/) — 41 pages indexed
- [developers.cloudflare.com](https://index.42a.ai/developers.cloudflare.com/) — 39 pages indexed
- [www.wurth.es](https://index.42a.ai/www.wurth.es/) — 38 pages indexed
- [www.izotope.com](https://index.42a.ai/www.izotope.com/) — 35 pages indexed
- [playwright.dev](https://index.42a.ai/playwright.dev/) — 30 pages indexed
- [www.aman.com](https://index.42a.ai/www.aman.com/) — 30 pages indexed
- [www.facebook.com](https://index.42a.ai/www.facebook.com/) — 30 pages indexed
- [mixmasterpro.io](https://index.42a.ai/mixmasterpro.io/) — 29 pages indexed
- [developer.mozilla.org](https://index.42a.ai/developer.mozilla.org/) — 29 pages indexed
- [brightdata.com](https://index.42a.ai/brightdata.com/) — 28 pages indexed
- [github.com](https://index.42a.ai/github.com/) — 21 pages indexed
- [www.tasmc.org.il](https://index.42a.ai/www.tasmc.org.il/) — 20 pages indexed
- [www.rosewoodhotels.com](https://index.42a.ai/www.rosewoodhotels.com/) — 18 pages indexed
- [developer.fedex.com](https://index.42a.ai/developer.fedex.com/) — 18 pages indexed
- [www.medreviews.co.il](https://index.42a.ai/www.medreviews.co.il/) — 18 pages indexed
- [www.aig.co.il](https://index.42a.ai/www.aig.co.il/) — 18 pages indexed
- [www.nsk.com](https://index.42a.ai/www.nsk.com/) — 18 pages indexed
- [www.aad.org](https://index.42a.ai/www.aad.org/) — 17 pages indexed
- [arxiv.org](https://index.42a.ai/arxiv.org/) — 16 pages indexed
- [bringits.com](https://index.42a.ai/bringits.com/) — 16 pages indexed
- [www.infomed.co.il](https://index.42a.ai/www.infomed.co.il/) — 16 pages indexed
- [www.google.com](https://index.42a.ai/www.google.com/) — 16 pages indexed
- [www.555.co.il](https://index.42a.ai/www.555.co.il/) — 15 pages indexed
- [cheatsheetseries.owasp.org](https://index.42a.ai/cheatsheetseries.owasp.org/) — 15 pages indexed
- [docs.zyte.com](https://index.42a.ai/docs.zyte.com/) — 15 pages indexed
- [docs.cloud.google.com](https://index.42a.ai/docs.cloud.google.com/) — 14 pages indexed
- [www.promofarma.com](https://index.42a.ai/www.promofarma.com/) — 14 pages indexed
- [www.fnx.co.il](https://index.42a.ai/www.fnx.co.il/) — 14 pages indexed
- [www.scrapingbee.com](https://index.42a.ai/www.scrapingbee.com/) — 14 pages indexed
- [ads.tiktok.com](https://index.42a.ai/ads.tiktok.com/) — 14 pages indexed
- [eur-lex.europa.eu](https://index.42a.ai/eur-lex.europa.eu/) — 13 pages indexed
- [docs.greatexpectations.io](https://index.42a.ai/docs.greatexpectations.io/) — 13 pages indexed
- [www.linkedin.com](https://index.42a.ai/www.linkedin.com/) — 13 pages indexed
- [es.trustpilot.com](https://index.42a.ai/es.trustpilot.com/) — 13 pages indexed
- [www.clalbit.co.il](https://index.42a.ai/www.clalbit.co.il/) — 13 pages indexed
- [www.roexaudio.com](https://index.42a.ai/www.roexaudio.com/) — 12 pages indexed
- [support.apple.com](https://index.42a.ai/support.apple.com/) — 12 pages indexed
- [play.google.com](https://index.42a.ai/play.google.com/) — 12 pages indexed
- [developer.dhl.com](https://index.42a.ai/developer.dhl.com/) — 12 pages indexed
- [developer.chrome.com](https://index.42a.ai/developer.chrome.com/) — 12 pages indexed
- [faq.whatsapp.com](https://index.42a.ai/faq.whatsapp.com/) — 12 pages indexed
- [oxylabs.io](https://index.42a.ai/oxylabs.io/) — 11 pages indexed
- [guide.michelin.com](https://index.42a.ai/guide.michelin.com/) — 11 pages indexed
- [scrapfly.io](https://index.42a.ai/scrapfly.io/) — 11 pages indexed
- [www.timken.com](https://index.42a.ai/www.timken.com/) — 11 pages indexed
- [www.zyte.com](https://index.42a.ai/www.zyte.com/) — 11 pages indexed
- [japauto.com.br](https://index.42a.ai/japauto.com.br/) — 11 pages indexed