isp.ortel.ru has no NS records.
NS records for this zone are defined at ortel.ru.
NS records for this zone are defined at ortel.ru.
Question and response
Question
dig isp.ortel.ru. NS
Answer
The response has no answer records.
Authority
ortel.ru. 3600 SOA ns.ortel.ru. hostmaster.ortel.ru. 2026021101 7200 7200 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0