YandexAccessibilityBot

Verifiable

Yandex's accessibility checker, which downloads pages to assess how accessible they are to users. Yandex documents that it sends up to three requests per second, ignores the crawl-rate setting in Yandex Webmaster, and does not follow the general robots.txt rules written for arbitrary robots.

Operated by Yandex · Official documentation

User agents

Patterns this directory matches, with real observed strings.

regexYandexAccessibilityBot/\d
observedMozilla/5.0 (compatible; YandexAccessibilityBot/3.0; +http://yandex.com/bots)

How to verify

Reverse-DNS check a client IP

dig -x <client-ip> +short   # expect a hostname matching *.yandex.ru

Reverse-DNS suffixes: *.yandex.ru, *.yandex.net, *.yandex.com

Good Bot Practices scorecard

Identifies honestly
Stable UA token documented (1 pattern)
Verifiable
Verifiable
Respects robots.txt
Does not honor robots.txt
Behaves
Crawl-rate behavior is operator-declared; not machine-verifiable from this dataset
Reachable operator
Operator and documentation published

Measured against the Good Bot Practices.