Passsive DNS

Passive DNS (Domain Name System) is a technology that is used to track the relationships between domain names and IP addresses over time. It is called "passive" because it does not actively query DNS servers for information, but rather relies on data that has been collected and logged by other sources.

Here is an example of how passive DNS can be used:

A cybersecurity investigator is trying to track down a malicious domain that was used to distribute malware. They use passive DNS to analyze the DNS records for the domain, which show the various IP addresses that the domain has been associated with over time. By analyzing this data, the investigator is able to identify other domains that have been associated with the same IP addresses, which may be related to the malicious domain. This information can be used to help track down the perpetrators and mitigate the threat.

Passive DNS is a valuable tool for cybersecurity investigators, as it allows them to analyze the relationships between domain names and IP addresses over time and identify patterns that may be indicative of malicious activity.