What is RDAP and how is it different from WHOIS?
RDAP (Registration Data Access Protocol) is the modern replacement for the traditional WHOIS protocol. While WHOIS has been used for decades to retrieve domain and IP registration data, RDAP was designed to provide a more secure, standardized, and structured way to access the same information.
Why WHOIS is outdated
WHOIS was created in the early days of the internet. It uses a plain text protocol, lacks standardized response formats, and does not provide built-in authentication or proper access control. Different registries often return inconsistent formats, making automated parsing unreliable.
- No standardized JSON output
- Limited security and access control
- Inconsistent data formatting between registries
- No native support for modern APIs
Why RDAP is better
RDAP was developed by the IETF to replace WHOIS with a modern, RESTful, HTTP-based protocol. It provides structured JSON responses, supports authentication, and allows better data redaction policies in line with GDPR and other privacy regulations.
- Standardized JSON responses
- HTTPS support and secure transport
- Consistent structure across registries
- Better compliance with privacy regulations
- Machine-readable and API-friendly
Why use RDAP Lookup instead of WHOIS?
RDAP Lookup provides structured domain, IP, and ASN registration data directly from authoritative registry sources. Unlike WHOIS tools that rely on legacy text responses, RDAP delivers reliable, parseable JSON data suitable for developers, security analysts, and network engineers.
If you need accurate and modern registration data access, RDAP is the recommended protocol going forward.