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OpenRDAP vs ICANN RDAP: catalog facts
OpenRDAP	ICANN RDAP
Free Free and open source under the MIT License.	Free Free and open source under either the Apache-2.0 or MIT license.
Windows, Linux, Command line	Windows, macOS, Linux, Command line
Supports domain, IP, autonomous system, nameserver, and entity queries. Outputs results as text or JSON, with WHOIS-style output for domain queries.	Queries domains, IP addresses, ASNs, and other RDAP resources Includes a test command and a simple in-memory server
Limitations not stated	Queries require access to RDAP services
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: Apache-2.0 OR MIT
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 6, 2026	Official website Full listing and sources Checked October 8, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.