What is Domain Threat Intelligence?
Domain threat intelligence APIs analyze domains for malicious activity including malware distribution, phishing attempts, and suspicious infrastructure. Essential for security teams, email filtering, and web protection.
Why DomScan is #1
- Generous free tier: 10,000 credits/month with no credit card
- Widest TLD coverage: 1,500+ extensions supported
- Modern REST API with JSON responses and excellent docs
- Unique MCP integration for AI assistants like Claude
- All-in-one: availability, valuation, DNS, brand monitoring
Best Domain Threat Intelligence APIs - Top 10
DomScan
Our Pick Free Tier- Generous free tier: 10,000 credits/month with no credit card
- Widest TLD coverage: 1,500+ extensions supported
- Modern REST API with JSON responses and excellent docs
urlscan.io
Runner Up Free Tier- Excellent page rendering and phishing investigation workflow
- Strong brand-monitoring and search capabilities
- Helpful for URL-centric security operations
FullHunt
Free Tier- Strong external attack-surface discovery workflow
- Typosquatting and brand-risk monitoring are built in
- Security automation story is stronger than generic lookup APIs
SecurityTrails
Free Tier- Massive passive DNS database
- Excellent subdomain enumeration
- Historical WHOIS and DNS data
Netlas
Free Tier- Very broad internet-scan, DNS, SSL, and WHOIS coverage
- Structured datasets are strong for security research
- Useful alternative to scan-first tools like Shodan or Censys
VirusTotal
Free Tier- Industry-leading threat detection
- Google-owned reliability
- Generous free tier
Shodan
Free Tier- Unmatched device discovery
- Well-known vulnerability and exposure workflows
- Strong API and alerting ecosystem
Censys
Free Tier- Comprehensive internet scanning
- Certificate and asset intelligence
- External attack surface discovery
DomainTools
- Decades of historical WHOIS data
- Advanced threat intelligence
- Iris, DNSDB, and monitoring products
WhoisXML API
Free Tier- Very broad domain and infrastructure coverage
- Historical WHOIS, DNS, and threat data
- Enterprise packages for security workflows
Detailed Reviews
DomScan Review
DomScan is the most developer-friendly domain intelligence API available today. Built on modern standards with a focus on real-time RDAP data, it offers unmatched TLD coverage and innovative AI integration.
Pros
- Industry-leading 1,500+ TLD support
- Generous free tier (10K credits/month)
- Clean REST API with JSON responses
- Unique MCP server for AI assistants
Cons
- Newer service (less track record than older providers)
- No historical WHOIS data yet
Our Verdict
DomScan is our top pick for developers building domain-related applications in 2026. The combination of wide TLD coverage, generous free tier, and modern API design makes it the clear choice for most use cases.
urlscan.io Review
urlscan.io is built for scanning web pages, indexing observed infrastructure, and detecting phishing or brand abuse from captured page data.
Pros
- Excellent page rendering and phishing investigation workflow
- Strong brand-monitoring and search capabilities
- Helpful for URL-centric security operations
Cons
- Not designed for valuation or registrar operations
- Coverage is scan-driven rather than registry-first
- Bulk lookup and enrichment differ from classic domain APIs
Our Verdict
urlscan.io is built for scanning web pages, indexing observed infrastructure, and detecting phishing or brand abuse from captured page data.
FullHunt Review
FullHunt combines internet asset discovery with subdomain enumeration, DNS intelligence, typo monitoring, and security automation for attack-surface management.
Pros
- Strong external attack-surface discovery workflow
- Typosquatting and brand-risk monitoring are built in
- Security automation story is stronger than generic lookup APIs
Cons
- Not focused on domain valuation or registrar buying flows
- Pricing is more sales-led than simple self-serve APIs
- Some teams only need lighter domain lookups than a full ASM platform
Our Verdict
FullHunt combines internet asset discovery with subdomain enumeration, DNS intelligence, typo monitoring, and security automation for attack-surface management.
SecurityTrails Review
SecurityTrails provides comprehensive DNS intelligence, passive DNS data, subdomain enumeration, and WHOIS history for security researchers and threat intelligence teams.
Pros
- Massive passive DNS database
- Excellent subdomain enumeration
- Historical WHOIS and DNS data
Cons
- Enterprise pricing not transparent
- Limited free tier
- Security-focused, not for domain registration
Our Verdict
SecurityTrails provides comprehensive DNS intelligence, passive DNS data, subdomain enumeration, and WHOIS history for security researchers and threat intelligence teams.
Netlas Review
Netlas combines search, internet-wide scan data, DNS records, SSL certificates, IP WHOIS, and domain WHOIS through structured APIs and bulk datasets.
Pros
- Very broad internet-scan, DNS, SSL, and WHOIS coverage
- Structured datasets are strong for security research
- Useful alternative to scan-first tools like Shodan or Censys
Cons
- Not built around valuation or registrar actions
- Coverage breadth can be overkill for simple product use cases
- Self-serve developer messaging is less streamlined than lightweight APIs
Our Verdict
Netlas combines search, internet-wide scan data, DNS records, SSL certificates, IP WHOIS, and domain WHOIS through structured APIs and bulk datasets.
VirusTotal Review
VirusTotal analyzes domains, URLs, and files for malware and malicious activity using 70+ antivirus engines and security tools.
Pros
- Industry-leading threat detection
- Google-owned reliability
- Generous free tier
Cons
- Security-only focus
- No domain registration features
- Rate limits on free tier
Our Verdict
VirusTotal analyzes domains, URLs, and files for malware and malicious activity using 70+ antivirus engines and security tools.
Shodan Review
Shodan indexes internet-facing devices, banners, vulnerabilities, and exposed services, making it a strong complement to domain-focused threat tools.
Pros
- Unmatched device discovery
- Well-known vulnerability and exposure workflows
- Strong API and alerting ecosystem
Cons
- No domain availability checking
- WHOIS and domain data are secondary
- Better for asset exposure than domain operations
Our Verdict
Shodan indexes internet-facing devices, banners, vulnerabilities, and exposed services, making it a strong complement to domain-focused threat tools.
Censys Review
Censys delivers internet-wide scanning, certificate intelligence, and external attack surface discovery for security teams and researchers.
Pros
- Comprehensive internet scanning
- Certificate and asset intelligence
- External attack surface discovery
Cons
- Not focused on domain availability
- WHOIS and registrar context are secondary
- Primarily for security use cases
Our Verdict
Censys delivers internet-wide scanning, certificate intelligence, and external attack surface discovery for security teams and researchers.
DomainTools Review
Enterprise-grade domain intelligence and threat detection platform
Pros
- Decades of historical WHOIS data
- Advanced threat intelligence
- Iris, DNSDB, and monitoring products
- Enterprise security teams, SOC analysts, threat hunters, forensic investigators, brand protection at scale
Cons
- Enterprise-only pricing
- Overkill for simple availability checks
- Limited fit for developer-first or low-volume projects
Our Verdict
DomainTools is the undisputed leader in enterprise threat intelligence and historical domain data. If you need decades of WHOIS history or advanced threat analysis for a security operations center, it is unmatched. However, for developers building domain tools or startups, the pricing is prohibitive and the feature set is excessive.
WhoisXML API Review
WhoisXML API is the go-to solution for enterprise security teams and researchers needing comprehensive threat intelligence and historical domain data. It is powerful but complex.
Pros
- Comprehensive threat intelligence
- Historical WHOIS data access
- Strong security research focus
- Extensive API coverage for security use cases
Cons
- Complex pricing structure
- Overkill for simple availability checks
- Steeper learning curve
Our Verdict
WhoisXML API excels at enterprise security use cases. If you need historical WHOIS data or threat intelligence, it is excellent. For simpler availability checking, it is unnecessarily complex and expensive.
How We Rank
Our rankings combine hands-on product testing with public pricing pages, official API documentation, TLD or dataset coverage, documentation quality, and overall developer experience.
Last updated: July 2026