static.8.138.76.144.clients.your-server.de has no CNAME records.
Question and response
Question
dig static.8.138.76.144.clients.your-server.de. NS
Answer
The response has no answer records.
Authority
76.144.clients.your-server.de. 4170 SOA ns1.your-server.de. postmaster.your-server.de. 2013052200 86400 1800 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0