mx-rd01.intra2net.com has no NS records.
NS records for this zone are defined at intra2net.com.
NS records for this zone are defined at intra2net.com.
Question and response
Question
dig mx-rd01.intra2net.com. NS
Answer
The response has no answer records.
Authority
intra2net.com. 300 SOA ns1.intra2net.com. postmaster.intra2net.com. 1761682893 10800 900 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0