Apex domains cannot have CNAME records.
Question and response
Question
dig slenderwrap.net. NS
Answer
slenderwrap.net. 2 NS ns-1585.awsdns-06.co.uk.
slenderwrap.net. 2 NS ns-695.awsdns-22.net.
slenderwrap.net. 2 NS ns-371.awsdns-46.com.
slenderwrap.net. 2 NS ns-1806.awsdns-33.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0