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WhoisXML API WHOIS API review

Freemium#2 of 27 in WHOIS Lookup Tools

A broad lookup API with RDAP, parsed data, integrations, and a free tier.

9.2/10Editor score
Visit WhoisXML API
WhoisXML API WHOIS API9.2 Visit WhoisXML API

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

WhoisXML API WHOIS API is a hosted REST service for retrieving registration data about domains, IPv4 and IPv6 addresses, and email addresses. It is aimed at developers, security teams, analysts, and workflows that need programmatic lookup rather than a standalone manual search page. GET and POST requests, API-key authentication, and server-to-server OAuth support common integration patterns, while JSON and XML responses fit downstream applications and data pipelines.

The published free access includes 500 queries or calls. Paid access is handled through a contact form, so the service is better suited to teams that can engage with the vendor for expanded access than to buyers comparing transparent self-serve tiers. Lookup coverage includes registrar, registrant, registry, dates, statuses, name servers, domain availability, raw text, and parsed WHOIS output. WHOIS, RDAP, or automatic protocol selection also gives users control over how records are retrieved.

Its ecosystem is a central strength. Listed integrations include Splunk, IBM QRadar, ServiceNow, Snowflake, Postman, Maltego, OWASP Amass, Sumo Logic, Pangea, Query, Logpresso, Cyware, ProjectDiscovery, and Malfors. Bulk lookup is available through the separate Bulk WHOIS API, supporting submitted lists of domains or IPs. Choose this service when broad API coverage, flexible response formats, and security or workflow integrations matter. An alternative is more suitable for buyers who require historical WHOIS records, a single bulk-lookup product, or publicly displayed paid-tier pricing.

WhoisXML API WHOIS API pros and cons

  • Where it wins
    • Supports WHOIS, RDAP, or automatic protocol selection
    • Returns parsed and raw data in JSON or XML
    • Connects with security, data, and workflow platforms
  • Where it doesn't
    • Historical WHOIS is not included
    • Bulk lookup uses a separate Bulk WHOIS API
    • Paid access is handled through a contact form

WhoisXML API WHOIS API fact sheet, pricing and score →

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