nss04.enbw.com has no CNAME records.
Question and response
Question
dig nss04.enbw.com. NS
Answer
The response has no answer records.
Authority
enbw.com. 10412 SOA nss01.enbw.com. hostmaster.enbw.com. 2026030501 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0