Spamhaus Blocklist contains IPs identified as sending spam, hosting malicious content, hijacking IP space, or acting like a bulletproof hosting company.| The Spamhaus Project
The Exploits Blocklist flags compromised IPv4/IPv6 addresses that have been hijacked to use by third-party exploits.| The Spamhaus Project
The Domain Blocklist contains domains showing signs of spam or malicious activity, including those owned by bad actors, or hijacked legitimate domains.| The Spamhaus Project
A dataset containing end-user IP address ranges from which email should never be sent directly to the final destination.| The Spamhaus Project