Apex domains cannot have CNAME records.
Question and response
Question
dig iptel.by. NS
Answer
iptel.by. 5 NS dns2.iptel.by.
iptel.by. 5 NS dns1.iptel.by.
iptel.by. 5 NS dns4.iptel.by.
iptel.by. 5 NS dns3.iptel.by.
Authority
The response has no authority records.
Additional
dns1.iptel.by. 5 A 80.94.225.6
dns2.iptel.by. 5 A 80.94.224.6
dns3.iptel.by. 5 A 31.130.204.179
dns4.iptel.by. 5 A 79.98.48.132
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0