Apex domains cannot have CNAME records.
Question and response
Question
dig spf.ezpublishing.com. NS
Answer
spf.ezpublishing.com. 2 NS ns3.ezpublishing.com.
spf.ezpublishing.com. 2 NS ns4.ezpublishing.com.
spf.ezpublishing.com. 2 NS ns.ezpublishing.com.
spf.ezpublishing.com. 2 NS ns2.ezpublishing.com.
Authority
The response has no authority records.
Additional
ns.ezpublishing.com. 2 A 71.6.106.11
ns2.ezpublishing.com. 2 A 71.6.106.12
ns3.ezpublishing.com. 2 A 71.6.106.13
ns4.ezpublishing.com. 2 A 71.6.106.14
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0