iw-mta.cniteam.com has no NS records.
NS records for this zone are defined at cniteam.com.
NS records for this zone are defined at cniteam.com.
Question and response
Question
dig iw-mta.cniteam.com. NS
Answer
The response has no answer records.
Authority
cniteam.com. 300 SOA primary.dns.bright.net. hostmaster.bright.net. 202603102 300 300 300 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0