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They prevent employees from accessing malicious sites by redirecting them to safe ones instead. System and network administrators, meanwhile, set up internal DNS sinkhole servers to achieve the same result. They divert requests to access malicious domains to IP addresses they control.
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Internet service providers (ISPs) and domain registrars use sinkholes to protect their clients. To understand DNS sinkholing better, watch this short video:ĭNS sinkholing can be applied by different people. But law enforcement agents and cybersecurity experts also use DNS sinkholes to point the would-be victims of cyber attacks to web properties that are safe to access instead. Cyber attackers can, for instance, use them to point users to their specially crafted malicious sites via DNS-based attacks like DNS hijacking. As a result, anyone who accesses one gets sent to a different IP address.ĭNS sinkholes can be both good and bad. In the same vein, a DNS sinkhole disrupts the intended flow of Internet traffic from a domain name to its correct IP address. When a sinkhole appears after an earthquake, for instance, all of the structures on the ground in it sink. The DNS was set up to point users to the correct IP address every time they type a specific domain name into their browsers in hopes of visiting a particular website. It is also known as a “sinkhole server,” an “Internet sinkhole,” or a “blackhole DNS.” A Domain Name System (DNS) sinkhole is simply a DNS server that gives users false domain names.