censys.io
Censys internet census scanner
About this crawler
censys.io is a web crawler identified by the regular-expression pattern censys.io in the User-Agent request header. It is categorised as scanner. Use the regex above to detect, log, allow, or block censys.io 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
- censys.io
- Pattern
censys.io- Tags
- scanner
- Reference
- https://censys.io/
- Added
- 2026/05/09
- Instances
- 1 known sample(s)
Sample User-Agent strings
censys.io internet census
Block this crawler
robots.txt — disallow censys.io:
User-agent: censys.io
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} censys.io [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "censys.io") {
return 403;
}
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