Apex domains cannot have CNAME records.
Question and response
Question
dig mirohost.net. NS
Answer
mirohost.net. 5 NS nsb4.srv53.org.
mirohost.net. 5 NS nsa3.srv53.com.
mirohost.net. 5 NS nsa1.srv53.org.
mirohost.net. 5 NS nsa2.srv53.net.
mirohost.net. 5 NS nsb1.srv53.com.
mirohost.net. 5 NS nsd1.srv53.org.
mirohost.net. 5 NS nsd4.srv53.com.
mirohost.net. 5 NS nsd2.srv53.net.
mirohost.net. 5 NS nsb2.srv53.net.
mirohost.net. 5 NS nsc2.srv53.net.
mirohost.net. 5 NS nsc3.srv53.com.
mirohost.net. 5 NS nsc2.srv53.org.
Authority
The response has no authority records.
Additional
nsa1.srv53.org. 5 A 178.32.247.3
nsb1.srv53.com. 5 A 135.181.9.147
nsd1.srv53.org. 5 A 89.184.64.93
nsa1.srv53.org. 5 AAAA 2001:41d0:203:dee4:178:32:247:3
nsb1.srv53.com. 5 AAAA 2a01:4f9:4a:530c:181:9:147:2
nsd1.srv53.org. 5 AAAA 2a02:2278:70eb:298:89:184:64:93
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0