THE DNSTWISTER RESOURCE LIBRARY

Domain Security Resources

Guides and tools for checking lookalike domains, monitoring suspicious activity, and responding to domain impersonation.

Explore the guides

MONITOR

Decide which domains to monitor, interpret the alerts and build a review process your team can maintain.

CHECK

Search for similar domains, then learn what the results do—and do not—tell you.

COMPARE

Choose between a browser check, hosted monitoring and a command-line investigation workflow.

UNDERSTAND

Understand what email authentication proves, where lookalikes fit and which controls address the gap.

RESPOND

A practical investigation checklist for an unfamiliar domain or a reported impersonation.

Use the free checker to review similar names and their DNS activity.