cdnsa.nic.Ru has no NS records.
NS records for this zone are defined at nic.Ru.
NS records for this zone are defined at nic.Ru.
Question and response
Question
dig cdnsa.nic.Ru. NS
Answer
The response has no answer records.
Authority
nic.Ru. 300 SOA ns5.nic.Ru. noc-dns.nic.Ru. 650335418 14400 3600 2592000 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0