DuckDuckBot
Official user agent and machine-readable prefix list from DuckDuckGo.
Official sources
User agents
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DuckDuckBot/1.1; (+http://duckduckgo.com/duckduckbot.html)
DuckDuckGo
DuckDuckGo documents DuckDuckBot and publishes a machine-readable prefix list (duckduckbot.json). Use DuckDuckGo’s official documentation and feed for current ranges.
Autonomous systems
Network background
DuckDuckBot egress often appears in cloud address space (commonly Microsoft Azure). Use DuckDuckGo’s published prefix list and live WHOIS alongside what you see in traffic.
Published ranges
Official documentation and feeds for each product—open the links for current ranges and verification guidance.