Overview
RDAP API
RDAP-first domain, IP, and ASN lookup API
RDAP API centers on RDAP lookups for domains, IP ranges, and ASNs for teams that want structured registration data without buying a larger intelligence platform.
Seven-day free trial on every planWhoAPI
Established Domain Availability & WHOIS API
WhoAPI provides domain availability checking and WHOIS lookup APIs with a focus on accuracy and bulk operations.
10,000 requests for new clientsPricing Comparison
| Pricing | RDAP API | WhoAPI |
|---|---|---|
| Free Tier | Seven-day free trial on every plan | 10,000 requests for new clients |
| Paid Plans | $9/month Starter plan | $52/month for 40,000 requests |
| Enterprise | $199/month Business plan | $499/month for 100,000 requests; enterprise custom |
| TLD Coverage | RDAP-enabled registries | 1,500+ TLDs |
Feature Comparison
| Feature | RDAP API | WhoAPI |
|---|---|---|
| Free Tier | Limited | Limited |
| API Access | Included | Included |
| Bulk Operations | Limited | Included |
| Real-time Data | Included | Included |
| WHOIS Data | Included | Included |
| DNS Lookup | Not Included | Limited |
| Domain Valuation | Not Included | Not Included |
| Brand Monitoring | Not Included | Not Included |
| MCP/AI Integration | Not Included | Not Included |
Which is Better?
Choose RDAP API if you need
- Focused RDAP experience for domains, IPs, and ASNs
- Cleaner fit for modern registration-data workflows
- Good option for teams that do not need a huge platform
Choose WhoAPI if you need
- Established since 2011
- Comprehensive WHOIS parsing
- Good for bulk availability checks
Consider DomScan Instead
DomScan offers the best of both worlds with comprehensive features and developer-friendly pricing.
- ✓ Free tier: 10,000 credits/month (no credit card)
- ✓ 1,100+ TLDs supported
- ✓ MCP integration for AI assistants
- ✓ Domain valuation, brand monitoring, OSINT
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