Apex domains cannot have CNAME records.
Question and response
Question
dig as20055.net. NS
Answer
as20055.net. 5 NS ns5.as20055.net.
as20055.net. 5 NS ns6.as20055.net.
as20055.net. 5 NS ns3.as20055.net.
as20055.net. 5 NS ns1.as20055.net.
as20055.net. 5 NS ns4.as20055.net.
as20055.net. 5 NS ns2.as20055.net.
Authority
The response has no authority records.
Additional
ns1.as20055.net. 5 A 137.83.56.1
ns2.as20055.net. 5 A 137.83.56.2
ns3.as20055.net. 5 A 168.245.136.216
ns4.as20055.net. 5 A 208.94.148.13
ns5.as20055.net. 5 A 208.80.124.13
ns6.as20055.net. 5 A 208.80.126.13
ns1.as20055.net. 5 AAAA 2001:506:39:0:0:0:0:1
ns2.as20055.net. 5 AAAA 2001:506:39:0:0:0:0:2
ns3.as20055.net. 5 AAAA 2604:7fc0:0:6:0:0:0:1
ns4.as20055.net. 5 AAAA 2600:1800:5:0:0:0:0:1
ns5.as20055.net. 5 AAAA 2600:1800:6:0:0:0:0:1
ns6.as20055.net. 5 AAAA 2600:1802:7:0:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0