Web-sniffer
Web Sniffer HTTP header analyzer
About this crawler
Web-sniffer is a web crawler identified by the regular-expression pattern Web-sniffer in the User-Agent request header. It is categorised as monitoring. Use the regex above to detect, log, allow, or block Web-sniffer 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
- Web-sniffer
- Pattern
Web-sniffer- Tags
- monitoring
- Reference
- http://web-sniffer.net/
- Added
- 2026/05/09
- Instances
- 3 known sample(s)
Sample User-Agent strings
Web-sniffer.me/1.0.0 (+http://web-sniffer.me/)
Web-sniffer/1.0.31 (+http://web-sniffer.net/)
Web-sniffer/1.1.0 (+http://web-sniffer.net/)
Block this crawler
robots.txt — disallow Web-sniffer:
User-agent: Web-sniffer
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} Web-sniffer [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "Web-sniffer") {
return 403;
}
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