dns.teowhong.com has no NS records.
NS records for this zone are defined at teowhong.com.
NS records for this zone are defined at teowhong.com.
Question and response
Question
dig dns.teowhong.com. NS
Answer
The response has no answer records.
Authority
teowhong.com. 3600 SOA dns.teowhong.com. hostmaster.teowhong.com. 1909310976 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0