`YandexDirectDyn`

Yandex says YandexDirectDyn generates dynamic banners. The robot list says it does not take the general rules in robots.txt into account. YandexDirect is a different token. The robot list says an agreement between Yandex and the site owner can override some robots.txt restrictions. This check does not apply that agreement.

robots.txt token: YandexDirectDyn
Operator: Yandex
Kind: ads_check
robots.txt: ignores_star. The vendor says this robot does not take the general User-agent: * rules in robots.txt into account.
HTTP user-agent: Mozilla/5.0 (compatible; YandexDirectDyn/1.0; +http://yandex.com/bots) The table publishes this string. YandexDirect is a different token on the previous row.
IP list: None on the cited page. This page says the IP list is not disclosed.
Source: How to check that a robot belongs to Yandex. Retrieved 2026-10-18.

JSON

curl -s https://whosthatbot.com/v1/crawlers/yandexdirectdyn

Check this token

tools/call with name check_robots is the same check at POST /mcp. The pasted file disallows YandexDirectDyn on /docs and allows *. The call does not fetch a host.

curl -s https://whosthatbot.com/mcp -H 'content-type: application/json' -H 'accept: application/json, text/event-stream' -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"check_robots","arguments":{"robots_txt":"User-agent: YandexDirectDyn\nDisallow: /\n\nUser-agent: *\nAllow: /\n","path":"/docs","ids":["yandexdirectdyn"]}}}'

That call returns fetched_target false. This row is disallow via group YandexDirectDyn, rule Disallow: /.