Looks like a possible bug in the whois 0-click goodie, which I sadly can't find in the github repos
https://duckduckgo.com/?q=whois+66.171.183.50This query, and a few others just say "Registered by ."
Some queries such as
https://duckduckgo.com/?q=whois+75.106.69.122 show absolutely no 0-click for some reason, but I suppose that is better than *almost* showing it...