BrowserBot-Observer
Observer third-party risk security scanner
About this crawler
BrowserBot-Observer is a web crawler identified by the regular-expression pattern BrowserBot-Observer in the User-Agent request header. It is categorised as scanner. Use the regex above to detect, log, allow, or block BrowserBot-Observer 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
- BrowserBot-Observer
- Pattern
BrowserBot-Observer- Tags
- scanner
- Reference
- https://obsrvr.net/about
- Added
- 2026/04/26
- Instances
- 1 known sample(s)
Sample User-Agent strings
BrowserBot-Observer (+https://siteobserver.co)
Block this crawler
robots.txt — disallow BrowserBot-Observer:
User-agent: BrowserBot-Observer
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} BrowserBot-Observer [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "BrowserBot-Observer") {
return 403;
}
← back to all crawlers