ns2.edgecdn.ru has no CNAME records.
Question and response
Question
dig ns2.edgecdn.ru. NS
Answer
The response has no answer records.
Authority
edgecdn.RU. 288 SOA ns1.edgecdn.ru. support.edgecenter.ru. 1738587348 5400 3600 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0