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: 68,990
Multi-Source Verified: 40,500
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 |
|---|---|---|---|---|---|
|
32,767 CIDRs
(40,500 IPs)
|
2026-09-11 14:51 | Both | Very Low Risk | Ultra-strict threat feed requiring multi-sensor correlation or verified malware C2 activity (32,767 CIDR blocks blocking 40,500 verified IPs). Engineered for zero-touch automated blocking with very low false positive risk. | |
|
50,394 CIDRs
(66,972 IPs)
|
2026-09-11 14:51 | Both | Low Risk | Wide-spectrum threat feed combining active web scanners, brute-force bots, and malware hosts (50,394 CIDR blocks blocking 66,972 unique IPs). Filters single-day transient noise and excludes TOR exit nodes for production firewalls. | |
|
52,041 CIDRs
(68,990 IPs)
|
2026-09-11 14:52 | Both | Medium Risk | Complete 100% union of all active primary threat feeds (52,041 CIDR blocks blocking 68,990 unique IPs), including TOR exit nodes and single-report scanners. Best suited for SIEM correlation, honeypots, and inbound perimeter rules. |
Individual Block Lists & Threat Feeds
| List name | Entries | Last update | Direction | False Positive Risk | Description |
|---|---|---|---|---|---|
| 36,471 IPs | 2026-09-11 14:51 | Incoming | Medium Risk | Real-time threat feed generated directly from OpenDBL's passive darknet sensor network. Read more → | |
| 590 IPs | 2026-09-11 14:49 | Incoming | Medium Risk | Compiled from multiple sources containing active, severely infected, and hostile hosts. Read more → | |
| 1,335 IPs | 2026-09-11 14:49 | Incoming | High Risk | Real-time updated list of known TOR network exit nodes. Read more → | |
| 615 IPs | 2026-09-11 14:50 | Incoming | High Risk | IP addresses reporting high volumes of SSH/service brute-force attack attempts. Read more → | |
| 22,276 IPs | 2026-09-11 14:49 | Incoming | Medium Risk | Attacking IP addresses detected across customer systems within the last 48 hours. Read more → | |
| 5,120 IPs | 2026-09-11 14:51 | Incoming | Low Risk | Top recommended attack sources from SANS Internet Storm Center DShield. Read more → | |
| 16,482 IPs | 2026-09-11 14:50 | Both | Low Risk | Aggregated threat list consisting of malicious IPs present in 3 or more blocklists. Read more → | |
| 1 IPs | 2026-09-11 14:50 | Outgoing | Low Risk | Active Command & Control (C2) servers for botnets, ransomware, and banking trojans (Dridex, TrickBot, QakBot). Read more → | |
| 4,491 IPs | 2026-09-11 14:50 | Incoming | Medium Risk | Real-time list of IP addresses carrying out brute-force attacks, port scans, and web exploits. Read more → | |
| 2,582 IPs | 2026-09-11 14:50 | Outgoing | Medium Risk | Real-time Indicators of Compromise (IOCs) for malware C2 and payload delivery infrastructure from abuse.ch. Read more → | |
| 1,715 IPs | 2026-09-11 14:50 | Both | Low Risk | Advisory list of hijacked or leased IP netblocks controlled entirely by cybercriminals. Read more → |
