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OpenRDAP vs IPNetInfo: catalog facts
OpenRDAP	IPNetInfo
Free Free and open source under the MIT License.	Free Freeware from NirSoft that may be redistributed free of charge.
Windows, Linux, Command line	Windows
Supports domain, IP, autonomous system, nameserver, and entity queries. Outputs results as text or JSON, with WHOIS-style output for domain queries.	Extracts IP addresses from pasted email headers Queries all five regional internet registries
Limitations not stated	Needs an internet connection and outgoing access to port 43 Official requirements list Windows 98 to Windows 10 only
Downloadable app	Downloadable app
Open source	Closed source
License: MIT	License: Freeware
Not stated if an account is needed	No account needed
Not stated if it works offline	Needs internet
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.