WebSniffer
Web analyzer retrieving HTTP headers and HTML for diagnostics
About this crawler
WebSniffer is a web crawler identified by the regular-expression pattern WebSniffer\/ in the User-Agent request header. It is categorised as seo. Use the regex above to detect, log, allow, or block WebSniffer 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
- WebSniffer
- Pattern
WebSniffer\/- Tags
- seo
- Reference
- https://websniffer.com/
- Added
- 2026/04/17
- Instances
- 1 known sample(s)
Sample User-Agent strings
WebSniffer/1.1 (+http://websniffer.com/)
Block this crawler
robots.txt — disallow WebSniffer:
User-agent: WebSniffer
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} WebSniffer\/ [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "WebSniffer\\/") {
return 403;
}
← back to all crawlers