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Both examples open for me

Some domains work, some not. I assume that working domains are cached.

amazon.de, spiegel.de are down for me, too. heise.de works, but that might've been cached somewhere on my side.

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.

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