Apex domains cannot have CNAME records.
Question and response
Question
dig tckops.net. NS
Answer
tckops.net. 5 NS ns-1163.awsdns-17.org.
tckops.net. 5 NS ns-1707.awsdns-21.co.uk.
tckops.net. 5 NS ns-458.awsdns-57.com.
tckops.net. 5 NS ns-673.awsdns-20.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0