Apex domains cannot have CNAME records.
Question and response
Question
dig lits.de. NS
Answer
lits.de. 5 NS ns.lits.de.
lits.de. 5 NS c.free.ns.buddyns.com.
lits.de. 5 NS ns2.afraid.org.
lits.de. 5 NS j.free.ns.buddyns.com.
lits.de. 5 NS k.free.ns.buddyns.com.
Authority
The response has no authority records.
Additional
c.free.ns.buddyns.com. 4 A 116.203.6.3
j.free.ns.buddyns.com. 4 A 37.143.61.179
k.free.ns.buddyns.com. 4 A 195.20.17.193
ns.lits.de. 5 A 159.69.64.189
ns2.afraid.org. 4 A 69.65.50.223
c.free.ns.buddyns.com. 4 AAAA 2a01:4f8:1c0c:8115:0:0:0:3
j.free.ns.buddyns.com. 4 AAAA 2a01:a500:2766:0:0:0:5c3f:d10b
k.free.ns.buddyns.com. 4 AAAA 2a10:1fc0:d:0:0:0:ae75:f39a
ns.lits.de. 5 AAAA 2a01:4f8:231:fde:0:0:2:130
ns2.afraid.org. 4 AAAA 2001:1850:1:5:800:0:0:6b
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0