On Wed, Apr 20, 2022 at 8:00 AM Antonia Affinito <antoniaaffinito12@gmail.com> wrote:
I noticed that, in case of a malicious domain name, some local resolvers send an NXDOMAIN and others a courtesy page address. Do you know if the resolvers (for example TIM, Wind or Fastweb) can return an NXDomain in order to protect their clients?

Howdy,

From a network engineering perspective, any resolver that responds to an authoritative NXDOMAIN by generating an address for a courtesy page -is- the malicious actor. Doubly so if they lie about the DNSSEC status in the response.

Regards,
Bill Herrin

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