Topic starter
24/10/2026 8:53 pm
TL;DR: IP blocklists covered only a small slice of live malicious edge traffic, GreyNoise reported, with eleven widely used OSINT and commercial feeds averaging 2.0% coverage on May 14, 2026. Freshness-sensitive blocklists need continuous intelligence or they will keep blocking old indicators while active sources slip past.
Editorial analysis by NHI Mgmt Group, based on content published by GreyNoise: “The Coverage Gap: Why Your Blocklist Is Missing 119,000 Malicious IPs Today”.
By the numbers:
- On a single day, May 14, 2026, the GreyNoise Global Observation Grid recorded 119,842 malicious, non-spoofable IPs targeting edge infrastructure.
- The average coverage across eleven widely deployed OSINT and commercial IP feeds was 2.0%.
Key questions
Q: Why do static reputation feeds miss so much malicious edge traffic?
A: Static feeds rely on manual curation, confidence thresholds, and delayed refresh cycles, while attackers rotate cloud, proxy, and residential infrastructure continuously.
Q: How can security teams tell whether their blocklist control is actually working?
A: Look for evidence that the list reflects current malicious activity, not just a large count of historical indicators.
Q: What breaks when IP blocklists are updated too slowly for current attack traffic?
A: They stop reflecting the infrastructure attackers are actually using, so defenders end up blocking yesterday’s scanners while today’s sources pass through.
Practitioner guidance
- Audit blocklist freshness against attacker turnover Measure how long malicious IP indicators remain actionable in your firewall pipeline and compare that window to the churn rate of the traffic you actually see.
- Prioritise observed-malicious telemetry over static reputation Use sensor-derived intelligence or other primary-source feeds where the control decision depends on current activity rather than historical confidence scores.
- Validate dynamic list provisioning end to end Test the full path from query creation to firewall ingestion, including refresh intervals, authentication method, and failure handling when the list stops updating.
Bottom line: Static IP blocklists can leave most live attacker infrastructure unaddressed when curation cannot keep pace with churn.
Glossary terms: Dynamic Blocklist, Primary-Source Intelligence, Non-Spoofable IP, Freshness
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This topic was modified 6 days ago by NHI Mgmt Group
25/10/2026 11:12 am
Static reputation is a governance failure when the threat infrastructure churns faster than curation. The article’s central point is not that blocklists are useless, but that static curation cannot keep pace with a threat environment measured in tens of thousands of changing IPs. That creates a control gap between what defenders think they are blocking and what is actually active. Practitioners should treat feed freshness as an operational control requirement, not a procurement preference.
A question worth separating out:
Q: Should organisations replace static blocklists with dynamic threat-intelligence feeds?
A: They should replace the assumption that one static list is enough, not every existing control. Dynamic feeds are most useful when they complement perimeter filtering with faster observation, better scoping, and a clear operational owner. The decision is about control freshness and trust, not about abandoning blocklists altogether.
👉 Read our full editorial: Static IP blocklists miss most edge attack traffic
This post was modified 6 days ago by NHI Mgmt Group