iot8.eu.org

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*Do you know what a DNS Sinkhole is?

A DNS sinkhole is a security mechanism that blocks access to malicious or unwanted domains by changing the DNS response before a connection is made. Instead of returning the real IP address, the resolver can return NXDOMAIN, a null address, or redirect the request to a controlled destination.

The process takes place on the recursive DNS resolver used by client devices. When a DNS query arrives, the resolver checks the requested domain against a security policy or blocklist. Allowed domains resolve normally, while blocked domains receive a modified response.

A DNS sinkhole can help organizations:

Stop connections to malware command-and-control servers.
Block phishing and malicious download domains.
Restrict unwanted trackers or services.
Detect infected devices through repeated blocked queries.

NXDOMAIN is often the preferred response because it clearly tells the client that the domain cannot be resolved.

If you want to know more, we recommend you take a look at the following article about DNS sinkhole!