Apex domains cannot have CNAME records.
Question and response
Question
dig cancom-mase.com. NS
Answer
cancom-mase.com. 4 NS ns03.cancom-mase.org.
cancom-mase.com. 4 NS ns04.cancom-mase.de.
cancom-mase.com. 4 NS ns01.cancom-mase.com.
cancom-mase.com. 4 NS ns02.cancom-mase.net.
cancom-mase.com. 4 NS ns05.cancom-mase.eu.
Authority
The response has no authority records.
Additional
ns01.cancom-mase.com. 4 A 212.237.161.1
ns02.cancom-mase.net. 4 A 195.227.141.140
ns03.cancom-mase.org. 4 A 18.198.240.246
ns04.cancom-mase.de. 4 A 195.135.138.20
ns05.cancom-mase.eu. 4 A 15.236.53.52
ns02.cancom-mase.net. 4 AAAA 2001:1440:0:4034:0:0:0:53
ns03.cancom-mase.org. 4 AAAA 2a05:d014:30e:a800:dc84:9c93:5d17:5882
ns04.cancom-mase.de. 4 AAAA 2001:1440:0:4039:0:0:0:53
ns05.cancom-mase.eu. 4 AAAA 2a05:d012:64d:bb00:dc84:9c93:5d17:5882
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0