Shadowserver vs Spamhaus

Shadowserver

Nonprofit that scans the Internet, collects and analyzes malware and threat data, and sends free daily remediation reports on vulnerable or compromised systems to network owners, CSIRTs and governments, while assisting law enforcement with cybercrime takedowns.

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.