ns4.creolineserver.com has no CNAME records.
Question and response
Question
dig ns4.creolineserver.com. NS
Answer
The response has no answer records.
Authority
creolineserver.com. 1982 SOA ns1.creolineserver.com. noc.creoline.de. 2026030424 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0