mx.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 mx.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. 1773618007 16384 2048 1048576 2560
Additional
The response has no additional records.