Compare software

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