Apex domains cannot have CNAME records.
Question and response
Question
dig accessh5.h5datacenters.com. NS
Answer
accessh5.h5datacenters.com. 5 NS ns-178.awsdns-22.com.
accessh5.h5datacenters.com. 5 NS ns-2030.awsdns-61.co.uk.
accessh5.h5datacenters.com. 5 NS ns-1434.awsdns-51.org.
accessh5.h5datacenters.com. 5 NS ns-971.awsdns-57.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0