Suggestions appear as you type. Use the up and down arrows to choose one and Enter to open it.

This page's audience our own tag's counts — open to see them
–Visits
–Page views
–Clicks to vendors
–Time on page
–Reading now
Clicks to vendors, by tool
  • –
Top countries
  • –
Devices
  • –

– · visits, page views and clicks counted by our own tag, which counts more than our checked analytics; every figure rounded down · how we count

Reverse WHOIS CLI review

Free#15 of 25 in Reverse WHOIS Search Tools

A capable command-line tool for current and historic Reverse WHOIS research.

7.7/10Editor score
Visit site
Reverse WHOIS CLI7.7 Visit site

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Reverse WHOIS CLI is an open-source Go command-line tool for cybersecurity analysts, threat-intelligence workflows, OSINT enrichment, and vendor or brand footprint discovery. It searches indexed WHOIS records using one or multiple terms, with support for both current and historic data. Targets can come from command-line flags, files, or standard input, making it suited to technical users who work with repeatable research workflows and bulk inputs.

The CLI itself is free and open source, but requests use the commercial WhoisXML API Reverse WHOIS endpoint and require an API key. Its search workflow includes preview counts and domain-list modes, helping users inspect a query before requesting results. Exclusion filters narrow results, while HTTP/HTTPS and SOCKS5 proxy support adds control over request routing. Concurrent workers and global rate limiting provide configuration options for larger searches without removing request pacing from the workflow.

Reverse WHOIS CLI is strongest when a team wants scriptable search controls rather than a graphical investigation interface. Deduplicated file output is useful for downstream analysis, and support for current and historic records broadens the research scope beyond a single live lookup. Users should choose it when they are comfortable with command-line tooling, API-key configuration, and external service requirements. Those seeking a standalone product without an API dependency, or a simpler interface for occasional searches, should consider an alternative.

Reverse WHOIS CLI pros and cons

  • Where it wins
    • Searches current or historic WHOIS records by one or multiple terms
    • Supports files, standard input, exclusions, proxies, and concurrent workers
    • Provides rate limiting and deduplicated file output
  • Where it doesn't
    • Requires an API key for the commercial WhoisXML API endpoint
    • Command-line workflows may not suit nontechnical teams
    • Output depends on the connected Reverse WHOIS service

Reverse WHOIS CLI fact sheet, pricing and score →

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Last updated · How we research and update