Domains Index is described as 'Domain Lists and Zone Files lists of all registered domain names, registered domains database. Over 290MM domains in our dataset. Daily updates and whois available' and is an app. There are more than 10 alternatives to Domains Index for Online / Web-based, Self-Hosted solutions, SaaS and Windows. The best alternative is DomainTools, which is free. Other great apps like Domains Index are ViewDNS.info, CubDomain, Online Domain Tools and Whois extractor.
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Get complete reports of domains, emails, or IP addresses with connections & leads in an in-depth, plain language document explaining the findings as developed by highly seasoned online investigators — for less than you'd expect.