IP lists

FireHOL IP Lists is a curated aggregator of threat intelligence IP blocklists from numerous public and community sources, all normalized into a consistent format for use in network security tools, firewalls, and SIEM systems. Maintained at iplists.firehol.org, it consolidates dozens of threat feeds covering malware C2 servers, TOR exit nodes, spam sources, anonymous proxies, botnets, and attacking IP ranges.

For OSINT investigators and threat intelligence analysts, FireHOL IP Lists serves as a quick validation tool for checking whether a specific IP address appears in known threat intelligence feeds. When an IP address surfaces during an investigation — from network logs, malware analysis, or infrastructure enumeration — cross-referencing it against FireHOL's aggregated lists establishes whether it is already known to the security community.

The platform's search interface allows lookups of specific IPs across all aggregated lists simultaneously, returning which specific threat categories the IP appears in and which upstream feeds reported it. This multi-feed comparison is valuable because different feeds specialize in different threat categories — an IP might not appear in a spam list but could be in a malware C2 list.

For network defenders, FireHOL IP Lists provides the raw list data for direct integration into iptables, firewall rules, Snort/Suricata signatures, or SIEM correlation rules. The lists are updated regularly and include metadata about update frequency and list confidence levels.

Investigative workflows: Run suspect IP addresses from incident logs against FireHOL to determine known threat associations, use the list data to contextualize IP addresses found during infrastructure reconnaissance, and incorporate relevant lists into network monitoring rules when setting up detection for specific threat categories.