Apex domains cannot have CNAME records.
Question and response
Question
dig ipfire.org. NS
Answer
ipfire.org. 5 NS nue.lwldns.net.
ipfire.org. 5 NS sof.lwldns.net.
ipfire.org. 5 NS haj.lwldns.net.
ipfire.org. 5 NS lhr.lwldns.net.
ipfire.org. 5 NS dfw.lwldns.net.
Authority
The response has no authority records.
Additional
dfw.lwldns.net. 5 A 74.113.60.134
haj.lwldns.net. 5 A 81.3.27.53
lhr.lwldns.net. 5 A 85.119.83.251
nue.lwldns.net. 5 A 116.202.177.11
sof.lwldns.net. 5 A 194.182.178.246
dfw.lwldns.net. 5 AAAA 2001:470:bbf2:2:0:0:0:10
haj.lwldns.net. 5 AAAA 2001:678:b28:0:0:0:0:53
lhr.lwldns.net. 5 AAAA 2a0a:1100:114d:0:0:0:0:53
nue.lwldns.net. 5 AAAA 2a01:4f8:1c0c:a00a:0:0:0:0
sof.lwldns.net. 5 AAAA 2a04:c47:e00:7d77:500:1:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0