nss02.enbw.com has no CNAME records.
Question and response
Question
dig nss02.enbw.com. NS
Answer
The response has no answer records.
Authority
enbw.com. 10800 SOA nss01.enbw.com. hostmaster.enbw.com. 2026022601 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0