What is the best free 'reverse whois' tool? Are there any that don't have a restriction?

I'm basically hoping to get reverse whois information on two companies, but they both have more than 1,000 domains, so I can't find a tool that'll show all of the domains (the best being reversewhois.io, that shows 1,000). It's for a fraud thing, but I don't have budget to pay for more. Do any free reverse whois tools show all domains?

Thanks!