mail.tgtnet.com has no NS records.
NS records for this zone are defined at tgtnet.com.
NS records for this zone are defined at tgtnet.com.
Question and response
Question
dig mail.tgtnet.com. NS
Answer
The response has no answer records.
Authority
tgtnet.com. 14400 SOA spkns01.towngastelecom.com. dnsadmin.hdcdatacentre.com. 2023020801 10800 3600 604800 38400
Additional
. 0 OPT ; payload 1024, xrcode 0, version 0, flags 0