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Who.isIPNetInfo
Freemium

Lookups are free; domain history reports and monitoring are paid services.

 Free

Freeware from NirSoft that may be redistributed free of charge.

Web Windows
  • WHOIS, RDAP, DNS and IP lookups in one site
  • Reverse nameserver lookup
  • Extracts IP addresses from pasted email headers
  • Queries all five regional internet registries
  • Full domain history requires a paid report
  • Monitoring is a premium service
  • Needs an internet connection and outgoing access to port 43
  • Official requirements list Windows 98 to Windows 10 only
Web application, Hosted service Downloadable app
Closed source Closed source
License not stated License: Freeware
Not stated if an account is needed No account needed
Needs internet Needs internet

Checked September 23, 2026

Checked October 8, 2026

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