--- title: "Google-Extended: user agent, token, block rate | Agent Ready Crawlers" description: "Google-Extended from Google: robots.txt token Google-Extended, training purpose and what a site can check; no exact user-agent string is published." canonical: https://agentreadycrawlers.com/crawlers/google-extended site: "Agent Ready Crawlers" last_updated: 2026-11-04 section: "Crawlers" --- # Google-Extended: user agent, token, block rate | Agent Ready Crawlers > Google-Extended from Google: robots.txt token Google-Extended, training purpose and what a site can check; no exact user-agent string is published. Source: https://agentreadycrawlers.com/crawlers/google-extended Site: Agent Ready Crawlers Last reviewed: 2026-11-04 Training crawler from Google # Google-Extended (control token) In short Google-Extended (control token) is Google's training crawler. The token to write in robots.txt is Google-Extended. The operator publishes nothing a site can check. 16.0 percent of 5,938 top-10,000 sites with a parsed robots.txt disallow it at the root (crawl of 2026-11-04). Google says it intends to support the AIPREF training preference signal (user-agent: \_\_usage\_ai-training) in early 2027. Operator [Google](https://agentreadycrawlers.com/crawlers/operator/google/) Vendor profile: [Google](https://agentreadycrawlers.com/vendors/google/) Purpose Training [All training rows](https://agentreadycrawlers.com/crawlers/purpose/training/). Collects content to train or tune a model. Refusing it is the training opt-out. User-agent string No exact string is published. What the operator or a third party says: None: crawling uses existing Google user agent strings; the token is a control only robots.txt token `Google-Extended` Matched case-insensitively (RFC 9309). The token and the user-agent string are different things. Respects robots.txt Yes, per operator Google: Google-Extended manages whether crawled content may be used for training future Gemini models and for grounding in Gemini Apps and Vertex AI; it does not affect Search inclusion or ranking. [Source](https://developers.google.com/search/docs/crawling-indexing/google-common-crawlers), read 2026-11-04. Verification Nothing published The operator publishes no list, reverse DNS pattern or key directory a site owner can check. [Documentation](https://developers.google.com/search/docs/crawling-indexing/google-common-crawlers), read 2026-11-04. IP ranges Not published. Rate behaviour No separate crawl. Block rate **16.0%** of 5,938 top-10,000 sites with a parsed robots.txt disallow `Google-Extended` at the root (949 sites). 12.6% name it; 3.4% refuse it only through a \* group. Rank 5 of 31 tokens measured. Across all 8,624 parsed robots.txt files in the crawl: 12.1% (9.6% named). Crawl of 2026-11-04; [report](https://agentreadycrawlers.com/block-rates/). Documentation [developers.google.com](https://developers.google.com/search/docs/crawling-indexing/google-common-crawlers), read 2026-11-04. Note. Google says it intends to support the AIPREF training preference signal (user-agent: \_\_usage\_ai-training) in early 2027. ## Allow and refuse lines ### To allow Google-Extended User-agent: Google-Extended Allow: / ### To refuse Google-Extended User-agent: Google-Extended Disallow: / Refusing or allowing in robots.txt states a preference. Enforcement of a refusal belongs in your WAF; see how to verify the identity above. ## Google in the Verification Ledger Five IP lists, reverse DNS for every class, and an experimental key directory for Google-Agent. Nothing for auto browse in the user's Chrome. [All operators](https://agentreadycrawlers.com/verification/). IP lists - [developers.google.com/static/search/apis/ipranges/googlebot.json](https://developers.google.com/static/search/apis/ipranges/googlebot.json) - [developers.google.com/static/search/apis/ipranges/special-crawlers.json](https://developers.google.com/static/search/apis/ipranges/special-crawlers.json) - [developers.google.com/static/search/apis/ipranges/user-triggered-fetchers.json](https://developers.google.com/static/search/apis/ipranges/user-triggered-fetchers.json) - [developers.google.com/static/search/apis/ipranges/user-triggered-fetchers-google.json](https://developers.google.com/static/search/apis/ipranges/user-triggered-fetchers-google.json) - [developers.google.com/static/search/apis/ipranges/user-triggered-agents.json](https://developers.google.com/static/search/apis/ipranges/user-triggered-agents.json) Reverse DNS crawl-\*.googlebot.com, geo-crawl-\*.geo.googlebot.com, rate-limited-proxy-\*.google.com, \*.gae.googleusercontent.com, google-proxy-\*.google.com Key directory https://agent.bot.goog/.well-known/http-message-signatures-directory (Google-Agent, subset of requests, experimental) Cloudflare not checked Visa TAP registry no public operator-level registration found (checked 2026-11-04) Mastercard Agent Pay no public operator-level registration found (checked 2026-11-04) ## Other Google rows - [Googlebot](https://agentreadycrawlers.com/crawlers/googlebot/) Search index token Googlebot - [Google-CloudVertexBot](https://agentreadycrawlers.com/crawlers/google-cloudvertexbot/) Other token Google-CloudVertexBot - [GoogleOther](https://agentreadycrawlers.com/crawlers/googleother/) Other token GoogleOther - [Storebot-Google](https://agentreadycrawlers.com/crawlers/storebot-google/) Search index token Storebot-Google - [Google-Agent](https://agentreadycrawlers.com/crawlers/google-agent/) Task agent no token - [Gemini in Chrome (auto browse)](https://agentreadycrawlers.com/crawlers/gemini-in-chrome/) Task agent no token - [Google-GeminiNotebook (was Google-NotebookLM)](https://agentreadycrawlers.com/crawlers/google-gemininotebook/) Live answer fetch no token ## Sources - [Google common crawlers](https://developers.google.com/search/docs/crawling-indexing/google-common-crawlers) read 2026-11-04 - [Verify requests from Google](https://developers.google.com/crawling/docs/crawlers-fetchers/verify-google-requests) read 2026-11-04 Last reviewed 2026-11-04