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DDG is a just a re-skin of Bing search. They don't do indexing.

• giancarlostoro 9y ago
  They don't just use bing is my understanding. Unless that's changed?
  • Whitestrake 9y ago
    This was my understanding too. Their Sources page[1] indicates that they run a crawler called DuckDuckBot (implying some indexing takes place), and have community maintained/crowd-sourced data as well. [1] https://duck.co/help/results/sources https://duck.co/help/results/sources
    • bduerst 9y ago
      Those are mostly DDG's instant answers, if I'm not mistaken, where websites use the SDK to submit their data to be crawled. DDG doesn't have webmaster tools or crawls domains natively.
  • bduerst 9y ago
    They also use Yandex, which isn't very relevant unless your website is in Russian, and allow websites to manually set up their pages for instant answers.