Apex domains cannot have CNAME records.
Question and response
Question
dig 2-add.com. NS
Answer
2-add.com. 5 NS ns-1790.awsdns-31.co.uk.
2-add.com. 5 NS ns-1871.awsdns-41.co.uk.
2-add.com. 5 NS ns-1073.awsdns-06.org.
2-add.com. 5 NS ns-1535.awsdns-63.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0