The Registration Data Access Protocol (RDAP) is the successor to WHOIS. Like WHOIS, RDAP provides access to information about Internet resources (domain names, autonomous system numbers, and IP addresses). Unlike WHOIS, RDAP provides:

RDAP.org aims to support users and developers of RDAP clients by providing a "bootstrap server", i.e. 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

Client Implementers

If you are developing an RDAP client, configure it to send HTTP requests to https://rdap.org/<type>/<object>, where <type> is the object type (one of domain, ip, autnum, entity etc) and <object> is the object identifier (eg example.com, 192.168.0.1, 64496, etc).

HTTP Status Codes

Note that these status codes only apply to the RDAP.org service itself, not the registry RDAP services themselves.

IANA RDAP Service

IANA has recently launched an RDAP service. Each TLD has its own RDAP record at https://rdap.iana.org/domain/{TLD} (root.rdap.org/domain now redirects to this server). You can also get an RDAP search result listing all TLDs using https://root.rdap.org/domains.

Additional Resources

Apart from the DNS, ASN and IP registries which are listed in the IANA registry, and IANA's own RDAP server, RDAP.ORG also provides an RDAP service for ICANN-accredited registrars. You can obtain RDAP records for ICANN-accredited registrars at https://registrars.rdap.org/entity/{NNNN}-iana where {NNNN} is the numeric IANA ID. These records are synthesised from data published by IANA and ICANN.

References

These are the authoritative references for the RDAP protocol specifications:

Many RDAP servers have also implemented their own custom extensions, some of which may be found in the RDAP Extensions registry at IANA.

Privacy Considerations

If you use RDAP.org to perform RDAP queries, your queries will be logged, alongside your IP address. These logs are not disclosed to anyone and are deleted within a few days. RDAP.org will not set any cookies in your browser.

Submit Feedback

If you would like to submit feedback please click here.

About RDAP.org

You can review the code which RDAP.org uses on GitHub.

RDAP.org is maintained by me, Gavin Brown. While I am currently an employee of ICANN, I run this service in my own time and at my own cost.

Supporting RDAP.ORG

If your organisation depends on RDAP.org, then please consider supporting it, since it's not free to operate and requires ongoing maintenance and management.

If you'd like to support this service, please email support@rdap.org to discuss options.