Apex domains cannot have CNAME records.
Question and response
Question
dig ihsystem.com. NS
Answer
ihsystem.com. 4 NS ns1.ihsystem.com.
ihsystem.com. 4 NS ns.ihsystem.com.
ihsystem.com. 4 NS ns2.ihsystem.com.
Authority
The response has no authority records.
Additional
ns.ihsystem.com. 4 A 72.22.68.250
ns1.ihsystem.com. 4 A 72.22.77.250
ns2.ihsystem.com. 4 A 159.203.129.142
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0