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I believe it's just when you get directed to their European servers. They also use us.startpage.com, as well as some other variations.

Because many users are concerned about using US services and servers, we give StartPage and Ixquick users the option to use servers outside the US.

We might also redirect to EU servers automatically in some cases. See: https://support.startpage.com/index.php?/Knowledgebase/Artic...