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It appears that part of the .de zone is missing from their name
servers resulting in NXDOMAIN for valid queries.

"It depends on the domain name. Before the letter F (denic.de, bund.de,
bild.de) everything works. After (google.de, tageszeitung.de,
heise.de), it fails."

https://lists.dns-oarc.net/pipermail/dns-operations/2010-May/005530.html