whois groups.google.com/g/seodon1/c/xE7XuLz5ReI/

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

groups.google.com/g/seodon1/c/xE7XuLz5ReI/
checking....groups.google.com/g/seodon1/c/xE7XuLz5ReI/
   $ whois groups.google.com/g/seodon1/c/xE7XuLz5ReI/
No whois server is known for this kind of object.