ns.elcom.ru has no CNAME records.
Question and response
Question
dig ns.elcom.ru. NS
Answer
The response has no answer records.
Authority
elcom.ru. 1617 SOA ns.elcom.ru. noc.elcom.ru. 2025052605 3600 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0