Apex domains cannot have CNAME records.
Question and response
Question
dig madek.ua. NS
Answer
madek.ua. 1 NS nsb2.srv53.org.
madek.ua. 1 NS nsa4.srv53.net.
madek.ua. 1 NS nsd1.srv53.com.
madek.ua. 1 NS nsd4.srv53.net.
madek.ua. 1 NS nsa4.srv53.org.
madek.ua. 1 NS nsc2.srv53.com.
madek.ua. 1 NS nsb1.srv53.com.
madek.ua. 1 NS nsb2.srv53.net.
madek.ua. 1 NS nsa3.srv53.com.
madek.ua. 1 NS nsc1.srv53.net.
madek.ua. 1 NS nsc3.srv53.org.
madek.ua. 1 NS nsd1.srv53.org.
Authority
The response has no authority records.
Additional
nsa4.srv53.net. 2 A 178.32.247.2
nsb1.srv53.com. 4 A 135.181.9.147
nsc1.srv53.net. 1 A 78.27.225.72
nsc3.srv53.org. 2 A 78.27.225.65
nsd1.srv53.com. 4 A 89.184.64.99
nsd1.srv53.org. 1 A 89.184.64.93
nsa4.srv53.net. 2 AAAA 2001:41d0:203:dee4:178:32:247:2
nsb1.srv53.com. 4 AAAA 2a01:4f9:4a:530c:181:9:147:2
nsc1.srv53.net. 1 AAAA 2a02:2279:0:1201:78:27:225:72
nsc3.srv53.org. 2 AAAA 2a02:2279:0:1201:78:27:225:65
nsd1.srv53.com. 4 AAAA 2a02:2278:70eb:298:89:184:64:99
nsd1.srv53.org. 1 AAAA 2a02:2278:70eb:298:89:184:64:93
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0