Censys vs RDAP API - Domain API Comparison

Overview

Censys

Internet Intelligence and Attack Surface Platform

Censys delivers internet-wide scanning, certificate intelligence, and external attack surface discovery for security teams and researchers.

Community tier with limited monthly queries

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

Pricing Comparison

Pricing	Censys	RDAP API
Free Tier	Community tier with limited monthly queries	Trial access
Paid Plans	Individual plans from $100/month	Usage-based API plans
Enterprise	Custom team and enterprise plans	Higher-volume options
TLD Coverage	Full IPv4/IPv6 coverage	RDAP-enabled registries

Feature Comparison

Feature	Censys	RDAP API
Free Tier	Limited	Limited
API Access	Included	Included
Bulk Operations	Included	Limited
Real-time Data	Included	Included
WHOIS Data	Limited	Included
DNS Lookup	Included	Not Included
Domain Valuation	Not Included	Not Included
Brand Monitoring	Not Included	Not Included
MCP/AI Integration	Not Included	Not Included

Which is Better?

Choose Censys if you need

Comprehensive internet scanning
Certificate and asset intelligence
External attack surface discovery

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

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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