whois trello.com/c/kdDIXgNw/

Domain:
Turn off cache
Try for webbased whois (don't expect it to work yet)

trello.com/c/kdDIXgNw/

checking....trello.com/c/kdDIXgNw/
$ whois trello.com/c/kdDIXgNw/
No whois server is known for this kind of object.