whois www.xing.com/profile/Derdi_Yok
Domain:
Turn off cache
Try for webbased whois (don't expect it to work yet)
www.xing.com/profile/Derdi_Yok
checking....www.xing.com/profile/Derdi_Yok
$
whois
www.xing.com/profile/Derdi_Yok
No whois server is known for this kind of object.