isMalicious + GreyNoise
Internet noise classification and enrichment. isMalicious consumes this source and correlates it with others — this page explains what that adds, and when to go to the source directly.
GreyNoise is one of the sources isMalicious aggregates
We are not a replacement for GreyNoise, and the table below is not a scoreboard. isMalicious ingests or queries GreyNoise alongside other sources and returns a single weighted verdict. Rows where isMalicious shows a capability GreyNoise does not are usually capabilities of the aggregation layer, not evidence that our data on GreyNoise's own specialty is better. For GreyNoise's primary use case, go to GreyNoise.
Quick verdict
Choose isMalicious for API-first threat intelligence with multi-source correlation, CVE data, and ransomware tracking. Choose GreyNoise for alert triage and internet noise reduction in siem environments.
isMalicious
Real-time threat intelligence API with multi-source correlation, CVE intelligence, and ransomware leak-site tracking.
Best for: Automated threat intelligence at scale
GreyNoise
GreyNoise analyzes mass internet scanner traffic to classify IPs as "noise" (automated scanners, crawlers, etc.) vs. targeted attacks. It helps reduce alert fatigue by filtering out benign scanner activity.
Best for: Alert triage and internet noise reduction in SIEM environments
Feature Comparison
| Feature | isMalicious | GreyNoise |
|---|---|---|
| IP reputation | ||
| Domain reputation | ||
| URL scanner | ||
| Internet scanner classification | Partial | |
| Multi-source threat correlation | ||
| Ransomware leak-site tracking | ||
| CVE intelligence (CVSS, EPSS, KEV) | Partial | |
| STIX/TAXII export | ||
| Bulk API | ||
| Streaming feed | ||
| NRD list | ||
| Free tier available |
Every row above comes from the data your own lookups query — see it on your own indicators.
Run a free reportGreyNoise — Strengths & Limitations
- Mass scanner classification
- Alert fatigue reduction
- Shodan-like enrichment
- SIEM integrations
- IP-only (no domain or URL reputation)
- Not a general-purpose threat feed
- No CVE-to-IOC correlation
- No ransomware tracking
- No dark web data
- Higher price point for full access
Pricing
GreyNoise
Free community tier, paid from ~$100/month
Frequently Asked Questions
Is isMalicious better than GreyNoise?
They solve different problems. GreyNoise specializes in classifying mass internet scanner noise to reduce alert fatigue. isMalicious provides a broader threat intelligence platform covering domain/URL reputation, CVEs, ransomware, and dark web data — making it better for teams that need comprehensive threat coverage beyond IP context.
Can I use isMalicious alongside GreyNoise?
Yes. Many teams use GreyNoise for scanner noise filtering and isMalicious for positive threat intelligence (malicious IPs, phishing domains, CVE data). The two complement each other well.
Does isMalicious reduce SIEM alert fatigue like GreyNoise?
isMalicious helps with alert fatigue through confidence-scored verdicts — low-confidence or conflicting signals are flagged separately rather than producing binary malicious/clean verdicts. You can tune alerting thresholds using CVSS scores, EPSS probabilities, or the raw confidence score.
Other Comparisons
Decide with your own data
Don't take our word over GreyNoise's. Check something real.
Paste any IP, domain, or URL and get a full multi-source report — reputation, WHOIS, DNS, ransomware signals, and an AI verdict. Free, no signup.
- 50 free API calls/month
- No credit card required
- API key in under 2 minutes