GF
Google Favicon
Google favicon web crawler bot
About this crawler
Google Favicon is a web crawler identified by the regular-expression pattern Google [fF]avicon in the User-Agent request header. It is categorised as search-engine. Use the regex above to detect, log, allow, or block Google Favicon traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
1.2%
Technical details
- Name
- Google Favicon
- Pattern
Google [fF]avicon- Tags
- search-engine
- Added
- 2019/03/14
- rDNS suffixes
.1e100.net,.googlebot.com,.googleusercontent.com- Instances
- 2 known sample(s)
rDNS verification (FCrDNS)
Verify a request is genuinely Google Favicon 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
Google favicon
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.75 Safari/537.36 Google Favicon
Block this crawler
robots.txt — disallow Google Favicon:
User-agent: Google Favicon
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} Google [fF]avicon [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "Google [fF]avicon") {
return 403;
}
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