ns1.edgecdn.RU has no NS records.
NS records for this zone are defined at edgecdn.RU.
NS records for this zone are defined at edgecdn.RU.
Question and response
Question
dig ns1.edgecdn.RU. NS
Answer
The response has no answer records.
Authority
edgecdn.RU. 300 SOA ns1.edgecdn.ru. support.edgecenter.ru. 1738587348 5400 3600 1209600 300
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0