Alex Samad wrote:

Jun 25 15:20:28 hufpuf named[3574]: client 59.151.50.247#9753: query
(cache) './A/IN' denied

can somebody shed some light on what they think they can gain ?

Perhaps it's a DDoS attack seeking to hide it's originating IP address.
Probably best to blackhole responses for exterior requests for ".".
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