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Both examples open for me
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Some domains work, some not. I assume that working domains are cached.
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amazon.de, spiegel.de are down for me, too. heise.de works, but that might've been cached somewhere on my side.
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dig manages to dig out ips for heise.de and tagesschau.de but not spiegel.de amazon.de and google.de However, dig @8.8.8.8 has still amazon.de cached, unlike 1.1.1.1 so perhaps Google to the rescue?

[Edit] After playing around with it, google seems to have at least some pages cached. After setting dns to 8.8.8.8 amazon.de and spiegel.de work again, my blog does not.

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idealo.de, ebay.de, and spiegel.de are down, but amazon.de opens for me.
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