DomainTools offers a comprehensive suite of domain research and monitoring tools to help companies with domain investigations and domain-related threat intelligence.
Custom pricing based on requirements
Best Whois API by APILayer Alternatives ranked by AI · updated Aug 2026
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Whois API by APILayer provides domain-registration information through a managed REST API distributed via the APILayer marketplace. It is intended for developers who prefer standardized billing, keys, and documentation across multiple APIs.
Top 6 Whois API by APILayer alternatives
WhoisFreaks is a domain and IP intelligence platform for developers, security teams, and researchers. It provides WHOIS, historical WHOIS, DNS, reverse WHOIS,...
Pros
- Combines current and historical WHOIS data with DNS and IP intelligence
- Offers APIs suited to automated domain-monitoring workflows
- Generally more accessible for smaller teams than enterprise domain-intelligence platforms
Cons
- Smaller ecosystem and brand footprint than DomainTools or SecurityTrails
- Coverage and historical depth can vary by TLD and registrar
- Enterprise investigation and collaboration features are less extensive than premium competitors
Freemium, paid plans from $10/mo
WhoisXML API supplies WHOIS, DNS, IP, domain reputation, and threat-intelligence data for developers, security teams, and data analysts. Its standout capability is...
Pros
- Broader API catalog than WhoisFreaks for enrichment and threat analysis
- Supports automated lookups, monitoring, and bulk data workflows
- Provides structured outputs that integrate readily with security platforms
Cons
- Pricing and product selection can be complex for small projects
- Some datasets and request volumes are restricted to higher tiers
- Individual API products may require separate evaluation for coverage
Freemium, paid plans available
Whois JSON API is a REST service that returns parsed domain-registration and WHOIS data in JSON format. It is designed for developers...
Pros
- Returns structured JSON instead of requiring clients to parse raw WHOIS text
- Designed specifically for domain-registration data and lookup integrations
- Simpler to integrate than enterprise-focused domain intelligence platforms
Cons
- Less broad domain intelligence coverage than DomainTools or SecurityTrails
- Pricing and quota details are less transparent than larger API marketplaces
- Coverage can vary by registry and privacy-redaction policy
SecurityTrails offers a platform where you can search and monitor domain registrations, DNS records, IP history, and other cybersecurity-related data.
Pros
- Rich DNS and IP data
- Historical data tracking
Cons
- Focused more on DNS and IP data than domain investigations
Starting from $49/month
Whois API provides domain data in real-time with a focus on domain availability, ownership, and contact information.
Pros
- Affordable pricing
- Real-time domain data
Cons
- Limited historical data
Starting from $9.95/month
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