a29.sub19.net78.udm.net has no CNAME records.
Question and response
Question
dig a29.sub19.net78.udm.net. NS
Answer
The response has no answer records.
Authority
udm.net. 3411 SOA a.ns.udmvt.ru. hostmaster.udm.net. 2025112601 86400 7200 4838400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0