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’.
polonus