YandexAntivirus
Yandex security and antivirus scanner
About this crawler
YandexAntivirus is a web crawler identified by the regular-expression pattern YandexAntivirus in the User-Agent request header. It is categorised as scanner. Use the regex above to detect, log, allow, or block YandexAntivirus traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
No block-rate data for this crawler.
Technical details
- Name
- YandexAntivirus
- Pattern
YandexAntivirus- Tags
- scanner
- Reference
- https://yandex.ru/support/webmaster/ru/robot-workings/check-yandex-robots.html
- Added
- 2026/05/02
- rDNS suffixes
.yandex.com,.yandex.net,.yandex.ru- Instances
- 1 known sample(s)
rDNS verification (FCrDNS)
Verify a request is genuinely YandexAntivirus with forward-confirmed reverse DNS: the client IP's PTR record must end in one of the suffixes below and a forward A/AAAA lookup of that hostname must return the same IP. UA strings alone are spoofable; FCrDNS is not.
.yandex.com.yandex.net.yandex.ru
Sample User-Agent strings
Mozilla/5.0 (compatible; YandexAntivirus/2.0; +http://yandex.com/bots)
Block this crawler
robots.txt — disallow YandexAntivirus:
User-agent: YandexAntivirus
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} YandexAntivirus [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "YandexAntivirus") {
return 403;
}
← back to all crawlers