Apex domains cannot have CNAME records.
Question and response
Question
dig von-oppen.com. NS
Answer
von-oppen.com. 5 NS ns.von-oppen.com.
von-oppen.com. 5 NS puck.nether.net.
von-oppen.com. 5 NS ns2.afraid.org.
Authority
The response has no authority records.
Additional
puck.nether.NET. 5 A 204.42.254.5
puck.nether.NET. 5 AAAA 2602:fe55:5:0:0:0:0:5
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0