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ROIS-DSOther crawler

Cotoyogi

Cotoyogi is a crawler run by the Center for Research and Development on Data Lake at ROIS-DS in Japan to collect Japanese language data resources.

Not tied to answers in an AI assistant.

Get the robots.txt ruleROIS-DS documentation
Is Cotoyogi allowed on your site?
  • CotoyogiOther
    Not checked

Reads your live robots.txt and applies the same rules these crawlers use. Nothing is stored.

robots.txt token
Cotoyogi
Follows robots.txt
Yes, documented
How to verify it
Published IP range
Seen on
Not measured
Last checked
17 September 2026

Should you block Cotoyogi?

Blocking it stops ROIS-DS collecting your pages for its Japanese language data resources. The operator page does not say how that data is used.

robots.txt
User-agent: Cotoyogi
Disallow: /

Asks Cotoyogi not to crawl any page. Add it to the robots.txt file at the root of your site, above any wider rules.

Ignored robots.txt?

Spot it in your logs.

Match the name, then check where the request came from. Anyone can copy a user-agent.

User-agentsource
Mozilla/5.0 (compatible; Cotoyogi/4.0; +https://ds.rois.ac.jp/center8/crawler/)

Version numbers change. Match the highlighted name, not the whole string.

  1. 1

    Match the name

    Search your server or CDN log for Cotoyogi, case-insensitive. A match is a clue, not proof.

  2. 2

    Check the published IP range

    ROIS-DS lists 157.1.136.4 to 157.1.136.11 as the crawler’s IP range. ds.rois.ac.jp/en_center8/en_crawler/

Is this really Cotoyogi?

Published addresses

Paste an address that claims to be Cotoyogi. It is checked against ROIS-DS’s published list. Nothing is stored.

Check any crawler’s address

Serve the content in HTML

The cited operator material does not verify JavaScript rendering. Serve useful HTML before client-side JavaScript where possible.

ROIS-DS says Cotoyogi follows RFC 9309, including wildcards and Crawl-delay, and honors the robots meta tag. Public AI crawler lists often label it an AI data crawler, but the operator page does not state an AI use.

Questions, answered.

Cotoyogi is a crawler run by the Center for Research and Development on Data Lake at ROIS-DS in Japan to collect Japanese language data resources.

Sources.

Officially documented. Operator facts and Trakkr’s measurements keep separate dates.

  1. [1]
    ROIS-DS crawler documentation

    Officially documented · checked 17 September 2026

    ds.rois.ac.jp/en_center8/en_crawler/

First verified 17 September 2026. Last source check 17 September 2026.

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