Apex domains cannot have CNAME records.
Question and response
Question
dig ungerboeck.com. NS
Answer
ungerboeck.com. 2 NS ns-266.awsdns-33.com.
ungerboeck.com. 2 NS ns-645.awsdns-16.net.
ungerboeck.com. 2 NS ns-1495.awsdns-58.org.
ungerboeck.com. 2 NS ns-1853.awsdns-39.co.uk.
Authority
The response has no authority records.
Additional
ns-645.awsdns-16.net. 4 A 205.251.194.133
ns-1495.awsdns-58.org. 4 A 205.251.197.215
ns-1853.awsdns-39.co.uk. 4 A 205.251.199.61
ns-266.awsdns-33.com. 4 AAAA 2600:9000:5301:a00:0:0:0:1
ns-645.awsdns-16.net. 4 AAAA 2600:9000:5302:8500:0:0:0:1
ns-1495.awsdns-58.org. 4 AAAA 2600:9000:5305:d700:0:0:0:1
ns-1853.awsdns-39.co.uk. 4 AAAA 2600:9000:5307:3d00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0