NB

Nimbostratus-Bot

seo Nimbostratus-Bot

Nimbostratus web crawler for cloud analysis

About this crawler

Nimbostratus-Bot is a web crawler identified by the regular-expression pattern Nimbostratus-Bot in the User-Agent request header. It is categorised as seo. Use the regex above to detect, log, allow, or block Nimbostratus-Bot traffic in your web server, CDN edge rules, or robots.txt.

Block-rate · top 25k sites

0.13%
latest snapshot
2026-06-04
matched key: Nimbostratus-Bot
2026-05-012026-06-040.17%

Technical details

Name
Nimbostratus-Bot
Pattern
Nimbostratus-Bot
Tags
seo
Added
2018/08/29
Instances
1 known sample(s)

Sample User-Agent strings

Mozilla/5.0 (compatible; Nimbostratus-Bot/v1.3.2; http://cloudsystemnetworks.com)

Block this crawler

robots.txt — disallow Nimbostratus-Bot:

User-agent: Nimbostratus-Bot Disallow: /

Apache .htaccess — return 403:

RewriteEngine On RewriteCond %{HTTP_USER_AGENT} Nimbostratus-Bot [NC] RewriteRule .* - [F,L]

Nginx — return 403 inside a server block:

if ($http_user_agent ~* "Nimbostratus-Bot") { return 403; }
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