What is Passive DNS and how do you leverage it in research?
CTOvision
JULY 12, 2016
The concept was created in 2004 to help mitigate the threat of malware but is now used for that and far more use cases. In DNS, this is known as an "A" record and is one of many different record types including, but not limited to AAAA (IPv6), MX (mail), NS (nameserver), and TXT (text). Bob Gourley.
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