RDAP API vs WHOISJSON - 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

WHOISJSON

WHOIS, DNS, SSL, and availability API with a lightweight free plan

WHOISJSON packages WHOIS, DNS, SSL certificate, and availability lookups into a lightweight API for teams that need practical lookup coverage without enterprise overhead.

Free plan available

Pricing Comparison

Pricing	RDAP API	WHOISJSON
Free Tier	Trial access	Free plan available
Paid Plans	Usage-based API plans	From $10/month
Enterprise	Higher-volume options	Higher-volume plans available
TLD Coverage	RDAP-enabled registries	1,500+ TLDs

Feature Comparison

Feature	RDAP API	WHOISJSON
Free Tier	Limited	Included
API Access	Included	Included
Bulk Operations	Limited	Limited
Real-time Data	Included	Included
WHOIS Data	Included	Included
DNS Lookup	Not Included	Included
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 WHOISJSON if you need

Covers WHOIS, DNS, SSL, and availability in one API
Simple entry pricing and low-friction onboarding
Useful free tier for early testing and prototypes

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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