Training · Yandex
YandexAdditional
Yandex's crawler for its neural network and AI features, separate from YandexBot which indexes for Yandex Search. Disallowing it does not affect search rankings.
- Operator
- Yandex
- Purpose
- Training crawlers
- Feeds
- Yandex AI
- robots.txt token
YandexAdditionalAlso:YandexAdditionalBot- Honours robots.txt
- Honours robots.txt
- Documentation
- yandex.com
What it looks like in server logs
A representative user-agent string. Version numbers change; the YandexAdditional token does not. Paste your own log line into the user-agent checker to confirm a match.
Mozilla/5.0 (compatible; YandexAdditional/1.0; +http://yandex.com/bots)How to block YandexAdditional
Add this to the robots.txt at the root of your domain. Robots.txt is advisory: it works only on crawlers that choose to read it. This one is honours robots.txt according to its operator.
User-agent: YandexAdditional
User-agent: YandexAdditionalBot
Disallow: /
To block every training crawler at once, or to block training while keeping AI search citations, use the robots.txt generator.
How to allow YandexAdditional while blocking others
A more specific User-agent group wins over a wildcard. Place this above any User-agent: * block that disallows paths, and YandexAdditional keeps full access.
User-agent: YandexAdditional
Allow: /
How to verify a genuine hit
The user-agent string is self-asserted: anyone can send it from a laptop, and scrapers routinely impersonate well-known crawlers to slip past filters aimed at unknown ones.
Yandex documents reverse-DNS verification against yandex.ru, yandex.net and yandex.com hosts.
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