Apex domains cannot have CNAME records.
Question and response
Question
dig s2p.de. NS
Answer
s2p.de. 5 NS woozle.jpmens.net.
s2p.de. 5 NS ns1.s2p.de.
s2p.de. 5 NS ns2.s2p.de.
Authority
The response has no authority records.
Additional
ns1.s2p.de. 5 A 144.76.139.8
ns2.s2p.de. 5 A 178.63.239.105
woozle.jpmens.net. 5 A 82.196.0.143
ns1.s2p.de. 5 AAAA 2a01:4f8:200:1307:0:0:0:10
woozle.jpmens.net. 5 AAAA 2a03:b0c0:0:1010:0:0:33:2001
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0