isMalicious vs Censys
A detailed comparison of isMalicious and Censys for security teams choosing a threat intelligence platform.
Quick verdict
Choose Censys for internet-wide asset and certificate discovery. Choose isMalicious for automated IP, domain, and URL reputation verdicts, CVE intelligence, ransomware tracking, and SOC-ready API enrichment.
isMalicious
Real-time threat intelligence API with multi-source correlation, CVE intelligence, ransomware tracking, and dark web monitoring.
Best for: Automated threat intelligence at scale
Censys
Censys indexes internet-facing hosts, certificates, and services to help security teams discover exposed assets and investigate infrastructure. It excels at attack surface visibility and certificate transparency data rather than real-time malicious verdict APIs.
Best for: Attack surface management and certificate/host discovery
Feature Comparison
| Feature | isMalicious | Censys |
|---|---|---|
| IP context (ports, banners) | Partial | |
| IP reputation verdict | ||
| Domain reputation | ||
| URL scanner | ||
| Certificate transparency search | Partial | |
| CVE intelligence (CVSS, EPSS, KEV) | Partial | |
| Ransomware tracking | ||
| Dark web monitoring | ||
| Streaming threat feed | ||
| STIX/TAXII export | ||
| Bulk API | ||
| NRD feed | ||
| Free tier available | Limited |
Censys — Strengths & Limitations
Strengths
- Certificate transparency search
- Internet-wide host indexing
- Attack surface discovery
- Historical certificate data
Limitations
- No real-time IP/domain reputation verdicts
- No phishing or malware URL scoring
- No ransomware group tracking
- No dark web monitoring
- No STIX/TAXII blocklist exports
- Enterprise pricing for full API access
Pricing
Censys
Free (limited), paid from ~$100/month, enterprise custom
Frequently Asked Questions
Is isMalicious a Censys alternative?
For threat intelligence and automated reputation scoring, yes. Censys is better for discovering what is exposed on the internet (hosts, certificates, services). isMalicious is better for answering whether an IP, domain, or URL is malicious and enriching SOC alerts at scale.
Does isMalicious include Censys data?
isMalicious aggregates certificate and infrastructure context from multiple sources. For full Censys-style internet-wide enumeration and certificate search, Censys remains the specialist tool.
Which is better for SOC automation?
isMalicious. SOC teams need fast verdict APIs, confidence scoring, bulk lookups, and integrations with SIEM/SOAR. Censys is typically used for periodic attack surface reviews rather than real-time alert enrichment.
Can I use both Censys and isMalicious?
Yes. Many teams use Censys for asset discovery and exposure management, and isMalicious for real-time threat scoring and blocklist exports in firewalls and SOAR playbooks.
Other Comparisons
Try isMalicious free
30 API calls/month free. No credit card required.