Apex domains cannot have CNAME records.
Question and response
Question
dig allomone.com. NS
Answer
allomone.com. 4 NS ns1.hukot.cz.
allomone.com. 4 NS ns2.securitynet.cz.
allomone.com. 4 NS ns3.hukot.cz.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0