Apex domains cannot have CNAME records.
Question and response
Question
dig imc-cranes.com. NS
Answer
imc-cranes.com. 5 NS ns-1802.awsdns-33.co.uk.
imc-cranes.com. 5 NS ns-121.awsdns-15.com.
imc-cranes.com. 5 NS ns-112.awsdns-14.com.
imc-cranes.com. 5 NS ns-1517.awsdns-61.org.
Authority
The response has no authority records.
Additional
ns-1802.awsdns-33.co.uk. 1 A 205.251.199.10
ns-1802.awsdns-33.co.uk. 1 AAAA 2600:9000:5307:a00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0