How Internet Noise Makes Security Harder | Cybersecurity Blog | Grey Noise

Summary: GreyNoise describes internet noise as unsolicited traffic from tens of thousands of unique IP addresses per day, including mass scans of all 4.2 billion routable IPv4 addresses by benign researchers, malicious actors, and unknown groups. It also counts legitimate business traffic from Microsoft O365, Google Workspace, Slack, CDNs, and public DNS servers that use unpublished or dynamic IPs, producing log events from addresses that appear unknown but are benign.
Bottom line: Every one of those events lands in a SOC queue, and GreyNoise frames the cost directly: analyst time pulled from real threats, inflated log volumes, higher storage costs, and burnout. The F5 BIG-IP example shows the stakes of sorting it wrong - malicious IPs scanned for the devices, checked for the vulnerability, and attempted to exploit it.

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