Apex domains cannot have CNAME records.
Question and response
Question
dig enom.com. NS
Answer
enom.com. 4 NS ns2.enom.com.
enom.com. 4 NS ns3.enom.com.
enom.com. 4 NS ns1.enom.com.
Authority
The response has no authority records.
Additional
ns1.enom.com. 4 A 216.40.47.235
ns2.enom.com. 4 A 64.98.148.123
ns3.enom.com. 4 A 216.40.47.236
ns1.enom.com. 4 AAAA 2604:4000:0:d:216:40:47:235
ns2.enom.com. 4 AAAA 2604:4000:2000:2000:64:98:148:123
ns3.enom.com. 4 AAAA 2604:4000:0:d:216:40:47:236
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0