lrtest2.ntp.ifsc.usp.br has no NS records.
NS records for this zone are defined at ifsc.usp.br.
NS records for this zone are defined at ifsc.usp.br.
Question and response
Question
dig lrtest2.ntp.ifsc.usp.br. NS
Answer
The response has no answer records.
Authority
ifsc.usp.br. 300 SOA deneb.ifsc.usp.br. scinfor.ifsc.usp.br. 2026030568 7200 3600 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0