Google-Extended: Google's robots.txt token
Google-Extended belongs to Google. It is not a separate crawler. It is a name you use in robots.txt to say whether content fetched by the operator's existing crawlers may be used for AI. Disallowing it opts your content out of that AI use. It has no effect on normal search crawling.
| Operator | |
|---|---|
| Used for | Gemini |
| Type | robots.txt token |
| robots.txt name | Google-Extended |
| User agent | None of its own: it is a robots.txt token |
| Published IP ranges | None published |
| Blocked by top sites | 13.2% of 740 (study) |
| Official documentation | developers.google.com/search/docs/crawling-indexing/google-common-craw |
Google says it has no separate user-agent string: crawling is done by Google's existing crawlers. It doesn't affect inclusion or ranking in Google Search.
Allow or block Google-Extended in robots.txt
To block it on the whole site:
User-agent: Google-Extended
Disallow: /To allow it explicitly (useful when a rule for all bots would block it):
User-agent: Google-Extended
Allow: /It controls whether content may be used to train future Gemini models and for grounding in Gemini Apps and Vertex AI.
robots.txt is a request, not a wall. A CDN or firewall rule can turn a bot away even when robots.txt allows it, and nothing in the file will show that.
The free check requests your home page as a browser and as AI bots, reads your robots.txt and shows what gets blocked. No sign-up.
Check my siteSee Google-Extended on your own site
Google-Extended doesn't run JavaScript, so analytics scripts never record it. AI Visibility in PageLens reads it from your server or CDN and shows which pages it requested, when, and which requests ended in a 404.