ns1.mastertel.ru has no NS records.
NS records for this zone are defined at mastertel.ru.
NS records for this zone are defined at mastertel.ru.
Question and response
Question
dig ns1.mastertel.ru. NS
Answer
The response has no answer records.
Authority
mastertel.ru. 3514 SOA ns1.mastertel.ru. noc.mastertel.ru. 2026020400 10800 3600 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0