Apex domains cannot have CNAME records.
Question and response
Question
dig nic.haus. NS
Answer
nic.haus. 5 NS v0n0.nic.haus.
nic.haus. 5 NS v0n3.nic.haus.
nic.haus. 5 NS v0n2.nic.haus.
nic.haus. 5 NS v0n1.nic.haus.
nic.haus. 5 NS v2n0.nic.haus.
nic.haus. 5 NS v2n1.nic.haus.
Authority
The response has no authority records.
Additional
v0n0.nic.haus. 29077 A 65.22.24.20
v0n1.nic.haus. 29077 A 65.22.25.20
v0n2.nic.haus. 29077 A 65.22.26.20
v0n3.nic.haus. 44397 A 161.232.12.20
v2n0.nic.haus. 29077 A 65.22.27.20
v2n1.nic.haus. 29077 A 161.232.13.20
v0n0.nic.haus. 29077 AAAA 2a01:8840:1a:0:0:0:0:20
v0n1.nic.haus. 29077 AAAA 2a01:8840:1b:0:0:0:0:20
v0n2.nic.haus. 29077 AAAA 2a01:8840:1c:0:0:0:0:20
v0n3.nic.haus. 44397 AAAA 2a01:8840:f6:0:0:0:0:20
v2n0.nic.haus. 29077 AAAA 2a01:8840:1d:0:0:0:0:20
v2n1.nic.haus. 29077 AAAA 2a01:8840:f7:0:0:0:0:20
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0