whois www.xing.com/profile/Zaf_Er

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

www.xing.com/profile/Zaf_Er

checking....www.xing.com/profile/Zaf_Er
$ whois www.xing.com/profile/Zaf_Er
No whois server is known for this kind of object.