Netcraft SSL Server Survey
Netcraft SSL certificate intelligence scanner
About this crawler
Netcraft SSL Server Survey is a web crawler identified by the regular-expression pattern Netcraft SSL Server Survey in the User-Agent request header. It is categorised as scanner. Use the regex above to detect, log, allow, or block Netcraft SSL Server Survey traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
0.33%
Technical details
- Name
- Netcraft SSL Server Survey
- Pattern
Netcraft SSL Server Survey- Tags
- scanner
- Reference
- https://knownagents.com/agents/netcraft-ssl-server-survey
- Added
- 2026/04/26
- Instances
- 1 known sample(s)
Sample User-Agent strings
Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; Netcraft SSL Server Survey - contact [email protected])
Block this crawler
robots.txt — disallow Netcraft SSL Server Survey:
User-agent: Netcraft SSL Server Survey
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} Netcraft SSL Server Survey [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "Netcraft SSL Server Survey") {
return 403;
}
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