Compare software

ICANN RDAPOpenRDAP
Free

Free and open source under either the Apache-2.0 or MIT license.

 Free

Free and open source under the MIT License.

Windows, macOS, Linux, Command line Windows, Linux, Command line
  • Queries domains, IP addresses, ASNs, and other RDAP resources
  • Includes a test command and a simple in-memory server
  • Supports domain, IP, autonomous system, nameserver, and entity queries.
  • Outputs results as text or JSON, with WHOIS-style output for domain queries.
  • Queries require access to RDAP services
 Limitations not stated
Downloadable app Downloadable app
Open source Open source
License: Apache-2.0 OR MIT License: 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

Checked October 8, 2026

Checked October 6, 2026

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