Spamhaus is an international blocklisting organization that was founded in Europe in 1998 to track spammers and spam-related activity. Spamhaus compiles and distributes six Domain Name System (DNS)-based blocklists (DNSBLs) and one domain-based blocklist (DBL). The most widely-used Spamhaus blocklist is the ZEN list, which combines all of their DNSBLs together.
Spamhaus's blocklists include:
- Spamhaus ZEN
- Spamhaus BCL
- Spamhaus XBL
- Spamhaus SBL
- Spamhaus PBL
- Spamhaus DBL
