smtp.jos.com.hk has no NS records.
NS records for this zone are defined at jos.com.hk.
NS records for this zone are defined at jos.com.hk.
Question and response
Question
dig smtp.jos.com.hk. NS
Answer
The response has no answer records.
Authority
jos.com.hk. 600 SOA ns1.josworld.com. postmaster.josworld.com. 2025092501 10800 3600 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0