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What is Passive DNS and how do you leverage it in research?

CTOvision

The concept was created in 2004 to help mitigate the threat of malware but is now used for that and far more use cases. A key use case of passive DNS data is to take an IP address known to be malicious and then find all the domain names that Passive DNS sensors have mapped to that IP address.

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A Tutorial For Enhancing Your Home DNS Protection

CTOvision

For example, if you select the free DNS service from Google, although there are privacy protections, they will be aggregating even more data on you and your browsing habits. They get data. If you want malware protection you have to add $20.00 DNS data and other PII is not sold or shared or used to serve you ads.

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