GreyNoise

GreyNoise solves a specific and genuinely underappreciated problem in threat intelligence: the internet is constantly being scanned indiscriminately by a vast number of automated tools, researchers, and bots, and the vast majority of IP addresses that trigger a security alert are part of this routine background noise rather than a targeted attack against your specific organisation. GreyNoise answers exactly this question, allowing security teams to automatically deprioritise alerts from known internet-wide scanning activity and focus analyst attention on IPs that are genuinely, specifically targeting them. This directly reduces one of the most persistent sources of SOC alert fatigue, and the genuine free tier makes this valuable context accessible even to smaller teams.

The honest and important limitation to understand is scope. GreyNoise is not a broad strategic threat intelligence platform, and organisations expecting criminal forum monitoring, APT actor tracking, or dark web intelligence from this tool will find it does not attempt to cover those areas at all.

The verdict: GreyNoise is right for security operations teams drowning in scanning noise wanting to quickly separate routine background activity from genuine targeted reconnaissance. Organisations wanting broad strategic threat intelligence should evaluate Recorded Future or Anomali ThreatStream instead, potentially alongside GreyNoise for this specific noise-reduction use case.

Last reviewed: September 2026

Strongest: Intelligence depth

Watch out for: Threat actor coverage

Best for

Security operations teams drowning in alerts from internet-wide scanning noise wanting to quickly distinguish routine background scanning from genuinely targeted reconnaissance.

Not suitable for: Organisations wanting broad strategic threat intelligence covering criminal forums, APT actor tracking, or dark web monitoring as their primary need.