dns.hketcmail.com has no NS records.
NS records for this zone are defined at hketcmail.com.
NS records for this zone are defined at hketcmail.com.
Question and response
Question
dig dns.hketcmail.com. NS
Answer
The response has no answer records.
Authority
hketcmail.com. 900 SOA host1.cntech.net. webmaster.hketcmail.com. 2026022750 1800 900 1209600 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0