gwcc-m.ntt.ru has no NS records.
NS records for this zone are defined at ntt.ru.
NS records for this zone are defined at ntt.ru.
Question and response
Question
dig gwcc-m.ntt.ru. NS
Answer
The response has no answer records.
Authority
ntt.ru. 3600 SOA ns.ntt.ru. george.ntt.ru. 20091587 86400 7200 3600000 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0