nsa.RETN.RU has no NS records.
NS records for this zone are defined at RETN.RU.
NS records for this zone are defined at RETN.RU.
Question and response
Question
dig nsa.RETN.RU. NS
Answer
The response has no answer records.
Authority
RETN.RU. 7200 SOA nsa.RETN.RU. noc.retn.net. 2026030300 7200 3600 1209600 14400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0