Apex domains cannot have CNAME records.
Question and response
Question
dig indigoutil.com. NS
Answer
indigoutil.com. 2 NS ns-2007.awsdns-58.co.uk.
indigoutil.com. 2 NS ns-1118.awsdns-11.org.
indigoutil.com. 2 NS ns-328.awsdns-41.com.
indigoutil.com. 2 NS ns-1529.awsdns-63.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0