Open Dynamic Block Lists
Free threat intelligence blocklists compatible with all firewalls and security devices supporting the following formats:
Standalone IPs:
x.x.x.x
CIDR Subnets: x.x.x.x/yy
Total Unique IPs: 56,403
Multi-Source Verified: 17,993
Polling Interval: ≥ 15 min
10+ Years Operational
Continuous, high-uptime threat intelligence service for enterprise firewalls since 2014.
Automated Feed Sanitization
Real-time filtering ensuring core Internet services & public DNS never show up in published lists.
Zero-Touch FP Safeguards
Multi-feed validation & automated surge anomaly detection protect production traffic.
OpenDBL CIDR-Optimized Feeds
| List name | Entries | Last update | Direction | False Positive Risk | Description |
|---|---|---|---|---|---|
|
13,567 CIDRs
(17,993 IPs)
|
2026-10-21 23:55 | Incoming | Very Low Risk | Ultra-strict threat feed requiring multi-sensor correlation (2+ independent feeds) or a hit on an externally-vetted threat-intelligence feed (ThreatFox, Feodo Tracker, Spamhaus DROP) (13,567 CIDR blocks blocking 17,993 verified IPs). Engineered for zero-touch automated blocking with very low false positive risk. | |
|
32,425 CIDRs
(49,620 IPs)
|
2026-10-21 23:55 | Incoming | Low Risk | Wide-spectrum threat feed combining active web scanners, brute-force bots, and malware hosts (32,425 CIDR blocks blocking 49,620 unique IPs). Darknet-sensor-only sightings must be corroborated by another feed or persist across 2+ distinct days; TOR exit nodes are excluded. Suited for production firewalls. | |
|
36,056 CIDRs
(56,403 IPs)
|
2026-10-21 23:55 | Incoming | High Risk | Complete union of all active external threat feeds (36,056 CIDR blocks blocking 56,403 unique IPs), including TOR exit nodes and single-report scanners with no corroboration or scoring threshold - except single-day-only sightings from our own darknet sensor pending corroboration. High false-positive risk — best suited for SIEM correlation and honeypots, not direct inbound blocking. |
Individual Block Lists & Threat Feeds
| List name | Entries | Last update | Direction | False Positive Risk | Description |
|---|---|---|---|---|---|
| 19,725 IPs | 2026-10-21 23:55 | Incoming | Medium Risk | Real-time threat feed generated directly from OpenDBL's passive darknet sensor network. Read more → | |
| 477 IPs | 2026-10-21 23:49 | Incoming | Medium Risk | Compiled from multiple sources containing active, severely infected, and hostile hosts. Read more → | |
| 1,224 IPs | 2026-10-21 23:49 | Incoming | High Risk | Real-time updated list of known TOR network exit nodes. Read more → | |
| 472 IPs | 2026-10-21 23:49 | Incoming | High Risk | IP addresses reporting high volumes of SSH/service brute-force attack attempts. Read more → | |
| 27,056 IPs | 2026-10-21 23:49 | Incoming | Medium Risk | Attacking IP addresses detected across customer systems within the last 48 hours. Read more → | |
| 5,120 IPs | 2026-10-21 23:55 | Incoming | Low Risk | Top recommended attack sources from SANS Internet Storm Center DShield. Read more → | |
| 19,850 IPs | 2026-10-21 23:50 | Both | Low Risk | Aggregated threat list consisting of malicious IPs present in 3 or more blocklists. Read more → | |
| 1 IPs | 2026-10-21 23:50 | Outgoing | Low Risk | Active Command & Control (C2) servers for botnets, ransomware, and banking trojans (Dridex, TrickBot, QakBot). Read more → | |
| 4,442 IPs | 2026-10-21 23:50 | Incoming | Medium Risk | Real-time list of IP addresses carrying out brute-force attacks, port scans, and web exploits. Read more → | |
| 2,632 IPs | 2026-10-21 17:50 | Outgoing | Medium Risk | Real-time Indicators of Compromise (IOCs) for malware C2 and payload delivery infrastructure from abuse.ch. Read more → | |
| 1,687 IPs | 2026-10-21 23:55 | Both | Low Risk | Advisory list of hijacked or leased IP netblocks controlled entirely by cybercriminals. Read more → |
