Apex domains cannot have CNAME records.
Question and response
Question
dig ipowerdns.com. NS
Answer
ipowerdns.com. 1 NS ns2.ipowerweb.net.
ipowerdns.com. 1 NS ns1.ipowerweb.net.
Authority
The response has no authority records.
Additional
ns1.ipowerweb.net. 2 A 66.96.142.103
ns2.ipowerweb.net. 2 A 65.254.254.139
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0