ns2.sochi.tv has no NS records.
NS records for this zone are defined at sochi.tv.
NS records for this zone are defined at sochi.tv.
Question and response
Question
dig ns2.sochi.tv. NS
Answer
The response has no answer records.
Authority
sochi.tv. 38400 SOA ns1.sochi.tv. root.sochi.tv. 1 38400 10800 259200 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0