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State of External Exposure Management, Summer 2024 Edition

Download the report now to stay ahead of emerging threats and strengthen your organization’s security posture for 2024. More...

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Cybersecurity Glossary

Passive DNS

In cybersecurity, passive DNS is used for detecting malicious activities like domain hijacking and botnets. It stores historical DNS information and provides insights into domain names and IP addresses. Passive DNS solutions enhance security posture and protect against emerging threats.

Passive DNS derives from collecting DNS query information in a database via network sniffing. While traditional DNS records are transient, passive DNS stores a collection and archive of historical DNS records. This contains a wealth of information about DNS queries on the Internet. Analysis of passive DNS data is used for insights into old DNS records, new values, and differences; it can also find possible attack vectors.

An attacker or defender with this information can see where, how, and when your organization’s domain names and IP addresses have changed over time and who is changing them.

See Also
Platform > Features
Discovery

A dynamic asset inventory, built using natural language processing and advanced analysis of open source intelligence (OSINT), at your fingertips.

Platform > Features
Contextualization

CyCognito automatically classifies your attack surface assets by business context and relationship to your organization. Act with knowledge and confidence.

Resources > Datasheets
Discovery and Contextualization

Learn how you can uncover your full organizational structure with high accuracy, enterprise scale, details, and evidence so that you can properly understand who owns and manages each digital asset exposed to the internet.

Resources > Solution Briefs
Discover and Contextualize

Download this brief to learn about the common problems that exist today within asset discovery and contextualization and how CyCognito can be implemented as a solution.

CyCognito Report

State of External Exposure Management, 2024 Edition

State of External Exposure Management Report

Critical vulnerabilities often hide in plain sight—especially in your web servers.

The report is a must-read for understanding today’s external risks and how to prioritize them effectively. Download the report to stay ahead of emerging threats and strengthen your security posture for 2025.

Get the Report