smtp.k2telecom.net.br has no NS records.
NS records for this zone are defined at net.br.
NS records for this zone are defined at net.br.
Question and response
Question
dig smtp.k2telecom.net.br. NS
Answer
The response has no answer records.
Authority
k2telecom.net.br. 3600 SOA ns1.k2telecom.net.br. ti.k2telecom.net.br. 2026030800 3600 900 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0