smtpgw.turknet.net.tr has no NS records.
NS records for this zone are defined at turknet.net.tr.
NS records for this zone are defined at turknet.net.tr.
Question and response
Question
dig smtpgw.turknet.net.tr. NS
Answer
The response has no answer records.
Authority
turknet.net.tr. 3600 SOA ns.turk.net. dnsadmin.turk.net. 2026030207 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0