DuckDuckGo Bot
DuckDuckBot is the Web crawler for DuckDuckGo. It respects WWW::RobotRules and originates from these IP addresses:
    107.20.237.51
    23.21.226.191
    107.21.1.8
    54.208.102.37
If you have any questions or concerns, please let us know..
Changelog
DuckDuckBot/1.1 - Bug fix: was not respecting robots.txt in some cases.
DuckDuckBot/1.0 - Initial version.