Apex domains cannot have CNAME records.
Question and response
Question
dig ultralightsoftware.com. NS
Answer
ultralightsoftware.com. 1 NS ns-195-b.gandi.net.
ultralightsoftware.com. 1 NS ns-9-c.gandi.net.
ultralightsoftware.com. 1 NS ns-2-a.gandi.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0