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ICANN RDAP vs WhoisCL: catalog facts
ICANN RDAP	WhoisCL
Free Free and open source under either the Apache-2.0 or MIT license.	Free Freeware from Nir Sofer.
Windows, macOS, Linux, Command line	Windows, Command line
Queries domains, IP addresses, ASNs, and other RDAP resources Includes a test command and a simple in-memory server	Selects a WHOIS server based on the domain extension Supports custom servers and SOCKS4 or SOCKS5 proxies
Queries require access to RDAP services	Windows only Requires an internet connection and WHOIS access on port 43
Downloadable app	Downloadable app
Open source	Closed source
License: Apache-2.0 OR MIT	License: Freeware
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 8, 2026

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