RDAP API vs WhoisXML API - Domain API Comparison

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.

Trial access

WhoisXML API

Enterprise Domain, IP & DNS Intelligence

WhoisXML API offers product-specific WHOIS, DNS, IP, and threat data packages plus annual enterprise bundles for research, fraud, and security teams.

Complimentary credits after signup

Pricing Comparison

Pricing	RDAP API	WhoisXML API
Free Tier	Trial access	Complimentary credits after signup
Paid Plans	Usage-based API plans	Product-specific subscriptions
Enterprise	Higher-volume options	Enterprise annual subscriptions
TLD Coverage	RDAP-enabled registries	7,500+ TLDs

Feature Comparison

Feature	RDAP API	WhoisXML API
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	Included
Domain Valuation	Not Included	Not Included
Brand Monitoring	Not Included	Premium Only
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 WhoisXML API if you need

Very broad domain and infrastructure coverage
Historical WHOIS, DNS, and threat data
Enterprise packages for security workflows

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)
✓ 1,500+ TLDs supported
✓ MCP integration for AI assistants
✓ Domain valuation, brand monitoring, OSINT

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