Threat Categories

NovaSense breaks threats down into 4 primary categories and provides lists seperately for each.

Threats are hosts that have attempted to exploit, brute force, or execute a denial of service attack. These are often compromised hosts, and can generally be blocked.
Known botnet and C&C servers, a smaller list of confirmed active botnet systems to be blocked at all times. These have responded with a valid botnet C2 response.
Systems that are infected with or involved in spreading malware and ransomware. Typically blocked on incoming firewalls but also useful on ADCs.
Confirmed spammers, comment spam, link spam, abusive crawlers, DoS and DDoS attacks and other miscellaneous abuses. Typically safe to block, but can have limited false positives.