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 WhoisAPI.com Alternatives ranked by AI · updated Aug 2026
WhoisAPI.com provides WHOIS lookup, domain availability, DNS, and related domain data for developers, registrars, and online businesses. Its main strength is a focused API designed for embedding domain checks and registration workflows.
Top 6 WhoisAPI.com 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
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
5
DomainIQ offers domain research tools for WHOIS lookup, domain ownership details, and domain monitoring.
Pros
- Comprehensive domain research capabilities
- Advanced domain monitoring features
Cons
- Requires subscription for full access
6
Whoxy
Whoxy
Whoxy is a WHOIS lookup and API service for developers, domain investors, and researchers. It stands out for low-cost structured WHOIS access,...
Pros
- Lower-cost option for straightforward WHOIS API access
- Offers bulk querying and developer-friendly JSON responses
- Useful for domain portfolios, availability checks, and basic research
Cons
- Less comprehensive security and infrastructure intelligence than WhoisFreaks
- Historical and reverse-WHOIS capabilities are more limited than premium tools
- Coverage depends on registrar and TLD availability
Free for limited use; paid credits available
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