www-tech.enbw.com has no CNAME records.
Question and response
Question
dig www-tech.enbw.com. NS
Answer
The response has no answer records.
Authority
enbw.com. 7931 SOA nss01.enbw.com. hostmaster.enbw.com. 2026030501 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0