whois groups.google.com/g/onpage-seo/c/njffvbLS0qY/

Domain:
Turn off cache
Try for webbased whois (don't expect it to work yet)
groups.google.com/g/onpage-seo/c/njffvbLS0qY/
checking....groups.google.com/g/onpage-seo/c/njffvbLS0qY/
   $ whois groups.google.com/g/onpage-seo/c/njffvbLS0qY/
No whois server is known for this kind of object.