Spamhaus

A nonprofit organization that tracks spam (glossary)spam Unwanted bulk messages, which count as DNS abuse only when used to deliver other abuse. Full definition of spam, phishing (glossary)phishing Impersonating a trusted party to steal data, often with look-alike domains. Full definition of phishing, malware (glossary)malware Harmful software, often spread or controlled using domain names. Full definition of malware and botnets (glossary)botnet A network of infected computers controlled by an attacker. Full definition of botnet and publishes widely used blocklists (glossary)blocklist A published list of domains or IP addresses to block for spam, phishing or malware. Full definition of blocklist of domains and IP addresses (glossary)IP Internet Protocol The internet's basic rules for sending data, using numeric addresses for every connected device. Full definition of IP. Mail providers rely on its lists, and its data is used in studies of abuse across registrars (glossary)registrar A company that registers domain names for customers with the registry. Full definition of registrar and TLDs (glossary)TLD top-level domain The last part of a domain name, after the final dot. Full definition of TLD, so it appears often in domain industry news.