sun.utelcom.ru has no CNAME records.
Question and response
Question
dig sun.utelcom.ru. NS
Answer
The response has no answer records.
Authority
utelcom.ru. 1868 SOA ns1.utelcom.ru. admin.utelcom.ru. 2026021600 3600 900 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0