The Registration Data Access Protocol (RDAP) is the successor to the ageing WHOIS protocol. Like WHOIS, RDAP provides access to information about Internet resources: domain names, autonomous systems, and IP addresses.
Unlike WHOIS, RDAP provides:
- A machine-readable representation of registration data;
- Differentiated access;
- Structured request and response semantics;
RDAP.org aims to support users and developers of RDAP clients by providing a single end point for RDAP queries. RDAP.org aggregates information about all known RDAP servers. RDAP clients can send RDAP queries to RDAP.org, which will then redirect requests to the appropriate RDAP service.
How To Use RDAP.org
If you are developing an RDAP client, configure it to send HTTP requests to http://rdap.org/<type>/<object>, where <type> is the object type (one of domain, ip, autnum etc) and <object> is the object identifier (eg example.com, 192.168.0.1, 64496, etc).
HTTP Status Codes
302– occurs when RDAP.org knows of an RDAP service which is authoritative for the requested resource. Follow the URL listed in the Location header.
400– occurs when RDAP.org receives an invalid request (malformed path, unsupported object type, invalid IP address, etc).
404– occurs when RDAP.org doesn’t know of an RDAP service which is authoritative for the requested resource.
500– occurs when RDAP.org is broken in some way.
504– occurs if RDAP.org needs to refresh the IANA bootstrap registry, but cannot.
- RFC7480: HTTP Usage in the Registration Data Access Protocol (RDAP)
- RFC7481: Security Services for the Registration Data Access Protocol (RDAP)
- RFC7482: Registration Data Access Protocol (RDAP) Query Format
- RFC7483: JSON Responses for the Registration Data Access Protocol (RDAP)
- RFC7484: Finding the Authoritative Registration Data (RDAP) Service
- RFC8056: Extensible Provisioning Protocol (EPP) and Registration Data Access Protocol (RDAP) Status Mapping
If you would like to submit feedback, or operate an RDAP service that you would like to be added to RDAP.org, please click here.
RDAP.org is maintained by Gavin Brown.
You can review the code which RDAP.org uses on GitHub.