# Google-Extended vs GoogleOther

Google-Extended and GoogleOther compared on 11 documented fields, from 17 claims, last verified 2026-09-15.

| Field | Google-Extended | GoogleOther | Comparison |
| --- | --- | --- | --- |
| honours_crawl_delay | n/a | no | different |
| observed_fetches_robots_txt | not documented | no | different |
| observed_requested_mcp_endpoint | not documented | yes | different |
| publishes_ip_list | no | yes | different |
| purpose_documented | policy_only | mixed | different |
| respects_robots_txt | n/a | yes | different |
| robots_token_differs_from_ua | yes | not documented | different |
| robots_txt_token | not documented | GoogleOther | different |
| separate_search_and_training_tokens | yes | not_documented | different |
| verifiable_by_rdns | n/a | yes | different |
| what_it_controls | Gemini model training and grounding, not Search inclusion | not documented | different |

## Differences

| Field | Google-Extended statement | GoogleOther statement |
| --- | --- | --- |
| honours_crawl_delay | Google does not publish any Crawl-delay behaviour for the Google-Extended token. | Google does not support the robots.txt Crawl-delay directive for GoogleOther. |
| observed_fetches_robots_txt | not documented | GoogleOther made 93 requests to Rattlesnakes By Mail between 2026-09-13T20:00Z and 2026-09-15T09:00Z and fetched /robots.txt on none of those requests. GoogleOther's first request to Rattlesnakes By Mail was the home page at 2026-09-14T12:03:30Z. |
| observed_requested_mcp_endpoint | not documented | GoogleOther requested the /mcp endpoint of Rattlesnakes By Mail twice between 2026-09-13T20:00Z and 2026-09-15T09:00Z, at 2026-09-14T15:07:30Z and at 2026-09-14T18:27:49Z. Rattlesnakes By Mail returned status 405 to both GoogleOther requests for /mcp. |
| publishes_ip_list | Google publishes no IP list for Google-Extended because Google-Extended has no separate HTTP request user agent string. | Google publishes the IP address ranges used by GoogleOther at https://developers.google.com/static/crawling/ipranges/common-crawlers.json. |
| purpose_documented | Google-Extended is a standalone product token that controls whether Google uses crawled content to train Gemini models. | GoogleOther is a generic crawler that Google product teams use to fetch publicly accessible content from sites. |
| respects_robots_txt | Google-Extended is a robots.txt token that publishers set to control use of crawled content for Gemini training. | GoogleOther obeys robots.txt rules when crawling automatically. |
| robots_token_differs_from_ua | Google-Extended is a robots.txt control token and does not correspond to a crawler user agent string. | not documented |
| robots_txt_token | not documented | The robots.txt token for GoogleOther is GoogleOther. |
| separate_search_and_training_tokens | Google-Extended controls Gemini training use only and does not affect inclusion in Google Search. | Google does not document whether content fetched by GoogleOther is used for Gemini training. |
| verifiable_by_rdns | Google does not publish a reverse-DNS verification method for Google-Extended. | GoogleOther requests are verifiable by reverse DNS lookup resolving to googlebot.com, google.com, or googleusercontent.com. |
| what_it_controls | Google-Extended controls AI training and grounding in Google systems and does not control Google Search inclusion. | not documented |

## Sources

- https://developers.google.com/crawling/docs/crawlers-fetchers/verifying-googlebot
- https://developers.google.com/search/blog/2019/07/a-note-on-unsupported-rules-in-robotstxt
- https://developers.google.com/search/docs/appearance/ai-features
- https://developers.google.com/search/docs/crawling-indexing/google-common-crawlers
- https://developers.google.com/static/crawling/ipranges/common-crawlers.json
- https://rattlesnakesbymail.com/observed/googleother