What are feed-based blocklists?

Feed-based blocklists provide real-time streams of threat indicators: malicious IPs, domains, URLs, and file hashes. Security systems subscribe to feeds, receiving continuous updates to block current threats.

Feed types: **IP reputation** (known spam/attack sources), domain blocklists (malicious domains), URL feeds (**phishing** pages, **malware**), and file hash feeds (known **malware**). Different feeds serve different filtering needs.

Integration: security gateways, firewalls, and mail servers consume feeds automatically, blocking matching traffic without manual intervention. Feed quality and update frequency determine effectiveness.