GreyNoise vs Spamhaus

GreyNoise

GreyNoise operates a global sensor network that observes internet-wide scanning and exploitation traffic and sells threat intelligence on that traffic. Security teams use it to block active exploitation of new vulnerabilities, find compromised devices on their network, and triage alerts.

Spamhaus

Spamhaus publishes IP and domain reputation data, including DNS-based blocklists of spam sources, botnet controllers and malicious networks, offered free for limited use and commercially via DNS queries, response policy zones and an intelligence API. It also provides a lookup tool for checking listings and a portal for reporting malicious activity.