DuckDuckBot
DuckDuckGo search engine web crawler bot
About this crawler
DuckDuckBot is a web crawler identified by the regular-expression pattern DuckDuckBot in the User-Agent request header. It is categorised as search-engine. Use the regex above to detect, log, allow, or block DuckDuckBot traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
0.52%
Technical details
- Name
- DuckDuckBot
- Pattern
DuckDuckBot- Tags
- search-engine
- Reference
- https://duckduckgo.com/duckduckgo-help-pages/results/duckduckbot
- Added
- 2012/09/19
- rDNS suffixes
.duckduckgo.com- Instances
- 4 known sample(s)
rDNS verification (FCrDNS)
Verify a request is genuinely DuckDuckBot with forward-confirmed reverse DNS: the client IP's PTR record must end in one of the suffixes below and a forward A/AAAA lookup of that hostname must return the same IP. UA strings alone are spoofable; FCrDNS is not.
.duckduckgo.com
Sample User-Agent strings
DuckDuckBot/1.0; (+http://duckduckgo.com/duckduckbot.html)
DuckDuckBot/1.1; (+http://duckduckgo.com/duckduckbot.html)
Mozilla/5.0 (compatible; DuckDuckBot-Https/1.1; https://duckduckgo.com/duckduckbot)
'Mozilla/5.0 (compatible; DuckDuckBot-Https/1.1; https://duckduckgo.com/duckduckbot)'
Block this crawler
robots.txt — disallow DuckDuckBot:
User-agent: DuckDuckBot
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} DuckDuckBot [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "DuckDuckBot") {
return 403;
}
← back to all crawlers