whois https://peatix.com/user/11866516/view

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

https://peatix.com/user/11866516/view
checking....https://peatix.com/user/11866516/view
   $ whois https://peatix.com/user/11866516/view
No whois server is known for this kind of object.