Google-Extended
Google · Model training · robots.txt token google-extended
5% of 30,177 measured domains disallow google-extended in robots.txt at the site root. Separately, and independently of robots.txt, 17.4% of 30,185 reachable domains refuse an AI crawler user agent at the network edge on two consecutive probes from different locations - a refusal the site's own robots.txt does not declare and its owner often has not chosen.
Measured 2026-10-06 by direct request to every domain in the corpus. Method: how this is measured. Reuse under CC BY 4.0 with attribution.
Cite as: Crawl Census, "Google-Extended blocking rate", measured 2026-10-06. https://crawlcensus.com/bot/google-extended
What it is definition
Control token with no user agent of its own; governs Gemini training and grounding use of Googlebot data.
Google-Extended is operated by Google and classified here as model training. These agents collect text and images that may end up in a training corpus. Disallowing one withholds new content from the next model. It does not withdraw anything collected before the disallow, and it does not remove the site from any answer engine.
Disallowing google-extended withholds content crawled from that point on from Google's training data. It does not withdraw pages collected in earlier crawls, it does not reach copies already sitting in third-party datasets, and it does not remove the site from any answer surface.
- robots.txt token
- google-extended
- Operator
- Purpose
- Model training
- Honors robots.txt
- yes
- Documentation
- https://developers.google.com/crawling/docs/crawlers-fetchers/google-common-crawlers
Identity on the wire no user agent
No user agent. Google-Extended is a robots.txt control token only. Nothing connects to a server identifying as Google-Extended: the fetching is done by Googlebot, and the token governs only what Google may then do with what was taken. A live request test against this name cannot tell you anything, so it is measured from the file alone.
How to allow it, how to block it robots.txt
User-agent: google-extended
Allow: /Absent any rule, the agent is already allowed, so this group only matters when your * group disallows something. Naming the agent replaces the * group for it entirely, so repeat here every disallow you still want to apply to it.
User-agent: google-extended
Disallow: /Disallowing google-extended withholds content crawled from that point on from Google's training data. It does not withdraw pages collected in earlier crawls, it does not reach copies already sitting in third-party datasets, and it does not remove the site from any answer surface.
Sites that block it 60 shown
See every measured domain that blocks Google-Extended
This list is served from a cache rebuilt just now. It is discarded the moment a rescan records a policy change for this agent, so a site that has just changed its robots.txt will drop off it within one scan rather than waiting for the cache to expire.
Compare Google
Google runs 5 agents in this registry, and they do different jobs. Blocking one says nothing about the others.
Common questions answered
Does blocking Google-Extended remove me from Gemini and AI Overviews?
No, not by itself. Google-Extended collects content for training, not for the index that answers questions. Google's answer surfaces are governed separately by googlebot, googlebot-news and google-cloudvertexbot, which stay allowed unless you disallow them too. Content collected before the disallow is not withdrawn.
How do I verify Google-Extended requests are genuine?
There is nothing to verify. Google-Extended has no user agent and never issues a request; it is a robots.txt token that governs what Google may do with content fetched by its ordinary crawler. Verify that crawler instead.
Check your own site free
See whether your robots.txt admits Google-Extended today, and whether your edge agrees with it.