The one site is a malformed IP4 address, the other IP6 address should be: -sinajs.xdwscache.glb0.lxdns.com.sixxs.org (Ghosted).
Suspicious pattern found: http://zulu.zscaler.com/submission/show/099ab821d6856cceea3f0078473670f7-1437171205
http://www.allesedv.at/IPv6/host/sinajs.xdwscache.glb0.lxdns.com
http://quttera.com/detailed_report/sinajs.xdwscache.glb0.lxdns.com.sixxs.org
Unable to properly scan your site. Site returning error (40x): HTTP/1.1 404 Could not gateway IPv6->IPv4: Empty reply from server
Not in namespace, that means been taken down.
Re: http://isithacked.com/check/sinajs.xdwscache.glb0.lxdns.com.sixxs.org
bad zone: Could not get name servers for ‘sinajs.xdwscache.glb0.lxdns.com.sixxs.org’.
Anonymous proxy: https://urlquery.net/report.php?id=1437172173280
Zero Sized Reply - almost like it is blocked. 9 out of 10 red riskstatus: http://toolbar.netcraft.com/site_report?url=http://8.37.231.20
Poodle vulnerable site: http://toolbar.netcraft.com/site_report?url=https://www.quantil.com
Site is not being blocked by Chinese Authorities: http://viewdns.info/chinesefirewall/?domain=http%3A%2F%2Fsinajs.xdwscache.glb0.lxdns.com.sixxs.org%2F
So could it be the other way round, blocked outside mainland China.
Netcraft risk status 9 red out of 10: http://toolbar.netcraft.com/site_report?url=116.255.235.199

polonus (volunteer website security analyst and website error hunter)