Apex domains cannot have CNAME records.
Question and response
Question
dig ic-sa.com. NS
Answer
ic-sa.com. 5 NS ns-1389.awsdns-45.org.
ic-sa.com. 5 NS ns-345.awsdns-43.com.
ic-sa.com. 5 NS ns-2039.awsdns-62.co.uk.
ic-sa.com. 5 NS ns-1999.awsdns-57.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0