01 · Operator
Who operates Centurybot
- Company
- RightDao
- Official docs
- rightdao.com
02 · Behavior
What Centurybot does
It crawls web pages to build RightDao's search index. The operator says it crawls politely, usually one page every few seconds per site. It follows robots.txt like Googlebot.
03 · Impact
Why Centurybot matters for your site
If you allow it
- Lets your pages appear in RightDao search
- Polite crawl rate and robots.txt support
If you block it
- Small search engine with little referral traffic
- Adds crawl load
04 · Allow
How to allow Centurybot
robots.txt
User-agent: Centurybot
Allow: /Cloudflare
# Security › WAF › Custom rules › Create rule
Expression: (http.user_agent contains "Centurybot")
Action: Skip › All Super Bot Fight Mode rules
# Also check Security › Bots: "Block AI bots" can block it regardless of robots.txt.WordPress
# WordPress serves a virtual robots.txt. Edit it with your SEO plugin:
# Yoast: SEO › Tools › File editor · Rank Math: General Settings › Edit robots.txt
User-agent: Centurybot
Allow: /nginx
# nginx serves every user agent by default.
# Make sure no rule like this blocks it:
# if ($http_user_agent ~* "Centurybot") { return 403; }Apache
# Apache serves every user agent by default.
# Make sure .htaccess has no rule like this:
# RewriteCond %{HTTP_USER_AGENT} Centurybot [NC]
# RewriteRule .* - [F,L]05 · Block
How to block Centurybot
Centurybot follows robots.txt, so one rule is enough. Use a server or CDN rule only to stop spoofed copies.
robots.txt
User-agent: Centurybot
Disallow: /Cloudflare
# Security › WAF › Custom rules › Create rule
Expression: (http.user_agent contains "Centurybot")
Action: BlockWordPress
# WordPress serves a virtual robots.txt. Edit it with your SEO plugin:
# Yoast: SEO › Tools › File editor · Rank Math: General Settings › Edit robots.txt
User-agent: Centurybot
Disallow: /nginx
# In your server { } block:
if ($http_user_agent ~* "Centurybot") {
return 403;
}Apache
# .htaccess
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} Centurybot [NC]
RewriteRule .* - [F,L]
</IfModule>06 · User agents
User agents we see for Centurybot
The user agent published by the operator:
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Centurybot/1.0; +http://www.rightdao.com/bot.html) Chrome/131.0.0.0 Safari/537.3607 · Verification
Is it really Centurybot?
Centurybot’s operator publishes no IP ranges or hostnames, so requests cannot be verified. Treat the user agent as a claim, and watch your logs for unusual request rates.
FAQ
Questions about Centurybot
What is Centurybot?
Centurybot is the crawler of the RightDao search engine. It indexes web pages for search.
Does Centurybot respect robots.txt?
Yes. RightDao says Centurybot follows robots.txt the same way Googlebot does.
How do I block Centurybot?
Add 'User-agent: Centurybot' with 'Disallow: /' to robots.txt, or email centurybot9@gmail.com.
Last reviewed Oct 7, 2026