expert.ukrtel.net has no CNAME records.
Question and response
Question
dig expert.ukrtel.net. NS
Answer
The response has no answer records.
Authority
ukrtel.net. 10800 SOA expert.ukrtel.net. hostmaster.ukrtel.net. 2025102801 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0