Apex domains cannot have CNAME records.
Question and response
Question
dig as40244.net. NS
Answer
as40244.net. 4 NS ns2.as40244.net.
as40244.net. 4 NS ns4.as40244.net.
as40244.net. 4 NS ns1.as40244.net.
as40244.net. 4 NS ns3.as40244.net.
Authority
The response has no authority records.
Additional
ns1.as40244.net. 4 A 208.85.6.46
ns2.as40244.net. 4 A 67.231.250.122
ns3.as40244.net. 4 A 173.233.71.218
ns4.as40244.net. 4 A 208.85.6.46
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0