Apex domains cannot have CNAME records.
Question and response
Question
dig algodata.com. NS
Answer
algodata.com. 2 NS ns-1469.awsdns-55.org.
algodata.com. 2 NS ns-1848.awsdns-39.co.uk.
algodata.com. 2 NS ns-156.awsdns-19.com.
algodata.com. 2 NS ns-544.awsdns-04.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0