server4.net.encoline.de has no CNAME records.
Question and response
Question
dig server4.net.encoline.de. NS
Answer
The response has no answer records.
Authority
net.encoline.de. 3657 SOA avalon.iks-jena.de. hostmaster.iks-jena.de. 2026022501 28800 3600 3600000 57600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0