Apex domains cannot have CNAME records.
Question and response
Question
dig tiscomhosting.eu. NS
Answer
tiscomhosting.eu. 5 NS ns3.tiscomhosting.eu.
tiscomhosting.eu. 5 NS ns1.tiscomhosting.nl.
tiscomhosting.eu. 5 NS ns2.tiscomhosting.net.
Authority
The response has no authority records.
Additional
ns1.tiscomhosting.nl. 5 A 77.95.248.106
ns2.tiscomhosting.net. 5 A 85.119.243.6
ns3.tiscomhosting.eu. 5 A 31.3.105.137
ns1.tiscomhosting.nl. 5 AAAA 2a00:1478:20:7:8:772:0:1
ns2.tiscomhosting.net. 5 AAAA 2a00:e760:100:7:8:1113:0:1
ns3.tiscomhosting.eu. 5 AAAA 2a03:7900:105:31:3:105:137:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0