hl-smtp02.viettelidc.com.vn has no NS records.
NS records for this zone are defined at viettelidc.com.vn.
NS records for this zone are defined at viettelidc.com.vn.
Question and response
Question
dig hl-smtp02.viettelidc.com.vn. NS
Answer
The response has no answer records.
Authority
viettelidc.com.vn. 2560 SOA ns.viettelidc.com.vn. cuongds.vietelidc.com.vn. 1774501208 16384 2048 1048576 2560
Additional
The response has no additional records.