whois fact-files-organization.gitbook.io/amazing-sites/

Domain:
Turn off cache
Try for webbased whois (don't expect it to work yet)
fact-files-organization.gitbook.io/amazing-sites/
checking....fact-files-organization.gitbook.io/amazing-sites/
   $ whois fact-files-organization.gitbook.io/amazing-sites/
No whois server is known for this kind of object.