Apex domains cannot have CNAME records.
Question and response
Question
dig zq1.de. NS
Answer
zq1.de. 5 NS lanpartei.de.
zq1.de. 5 NS ns1.lsmod.de.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0