Apex domains cannot have CNAME records.
Question and response
Question
dig tempurl.host. NS
Answer
tempurl.host. 5 NS ns-736.awsdns-28.net.
tempurl.host. 5 NS ns-117.awsdns-14.com.
tempurl.host. 5 NS ns-1651.awsdns-14.co.uk.
tempurl.host. 5 NS ns-1353.awsdns-41.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0