Google-Agent
Google's user-triggered agent for web navigation
About this crawler
Google-Agent is a web crawler identified by the regular-expression pattern Google-Agent in the User-Agent request header. It is categorised as browser-automation. Use the regex above to detect, log, allow, or block Google-Agent traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
0.065%
Technical details
- Name
- Google-Agent
- Pattern
Google-Agent- Tags
- browser-automation
- Reference
- https://developers.google.com/crawling/docs/crawlers-fetchers/google-user-triggered-fetchers
- Added
- 2026/04/26
- rDNS suffixes
.1e100.net,.googlebot.com,.googleusercontent.com- Instances
- 1 known sample(s)
rDNS verification (FCrDNS)
Verify a request is genuinely Google-Agent 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.
.1e100.net.googlebot.com.googleusercontent.com
Sample User-Agent strings
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko; compatible; Google-Agent)
Block this crawler
robots.txt — disallow Google-Agent:
User-agent: Google-Agent
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} Google-Agent [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "Google-Agent") {
return 403;
}
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