S
StumbleUpon
StumbleUpon content discovery
About this crawler
StumbleUpon is a web crawler identified by the regular-expression pattern StumbleUpon in the User-Agent request header. It is categorised as social-preview. Use the regex above to detect, log, allow, or block StumbleUpon traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
0.065%
Technical details
- Name
- StumbleUpon
- Pattern
StumbleUpon- Tags
- social-preview
- Added
- 2026/05/09
- Instances
- 3 known sample(s)
Sample User-Agent strings
Mozilla/5.0 (Windows NT 6.1; StumbleUpon; [email protected]) Chrome/58.0.3029.110 Safari/537.36
Mozilla/5.0 (Windows NT 6.1; rv:12.0; StumbleUpon; [email protected]) Gecko/20100101 Firefox/12.0
Mozilla/5.0 (Windows NT 6.1; rv:40.0; StumbleUpon; [email protected]) Gecko/20100101 Firefox/40.1
Block this crawler
robots.txt — disallow StumbleUpon:
User-agent: StumbleUpon
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} StumbleUpon [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "StumbleUpon") {
return 403;
}
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