Apex domains cannot have CNAME records.
Question and response
Question
dig ipalm.com. NS
Answer
ipalm.com. 5 NS ns-399.awsdns-49.com.
ipalm.com. 5 NS ns-734.awsdns-27.net.
ipalm.com. 5 NS ns-1450.awsdns-53.org.
ipalm.com. 5 NS ns-2030.awsdns-61.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0