mail.DEDIC-CENTER.RU has no NS records.
NS records for this zone are defined at DEDIC-CENTER.RU.
NS records for this zone are defined at DEDIC-CENTER.RU.
Question and response
Question
dig mail.DEDIC-CENTER.RU. NS
Answer
The response has no answer records.
Authority
DEDIC-CENTER.RU. 3600 SOA DEDIC-CENTER.RU. root.DEDIC-CENTER.RU. 2014091646 10800 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0