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Head-to-head comparison

isMalicious vs Censys

Internet-wide asset and certificate search. Features, pricing and API limits side by side.

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isMalicious leads on 9 of 12 compared capabilities

1 shared — full breakdown in the table below

Quick verdict

Choose Censys for internet-wide asset and certificate discovery. Choose isMalicious for IP, domain and URL reputation verdicts, CVE and ransomware data, and SOC enrichment by API.

isMalicious

Threat intelligence API with multi-source correlation, CVE data and ransomware leak-site tracking.

Best for: Automated threat intelligence at scale

Censys

Censys indexes internet-facing hosts, certificates and services so teams can find exposed assets and investigate infrastructure. Its strength is attack surface and certificate data, not reputation verdicts.

Best for: Attack surface management and certificate/host discovery

Feature comparison

FeatureisMaliciousCensys
IP context (ports, banners)Partial
IP reputation verdict
Domain reputation
URL scanner
Certificate transparency searchPartial
CVE intelligence (CVSS, EPSS, KEV)Partial
Ransomware leak-site tracking
Streaming threat feed
STIX/TAXII export
Bulk API
NRD feed
Free tier availableLimited

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Censys: strengths and 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

isMalicious

Free: website lookups with no monthly cap and 250 API calls a month. Pro from €99/month. Enterprise custom pricing.

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Censys

Free (limited), paid from ~$100/month, enterprise custom

Frequently asked questions

Is isMalicious a Censys alternative?

For threat intelligence and reputation scoring, yes. Censys shows what is exposed on the internet: hosts, certificates, services. isMalicious answers whether an IP, domain or URL is malicious and enriches SOC alerts.

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.

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Decide with your own data

Don't take our word over Censys's. Check something real.

Paste an IP, domain or URL: reputation, WHOIS, DNS, ransomware signals and an AI-generated assessment. Free, no signup.

  • 250 free API calls/month
  • No credit card required
  • API key in under 2 minutes
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