isp.24hc.ru has no NS records.
NS records for this zone are defined at 24hc.ru.
NS records for this zone are defined at 24hc.ru.
Question and response
Question
dig isp.24hc.ru. NS
Answer
The response has no answer records.
Authority
24hc.ru. 60 SOA isp.24hc.ru. info.itcom.info. 2017052253 60 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0