o1.ptr5371.email.nmbrsapp.com has no NS records.
NS records for this zone are defined at email.nmbrsapp.com.
NS records for this zone are defined at email.nmbrsapp.com.
Question and response
Question
dig o1.ptr5371.email.nmbrsapp.com. NS
Answer
The response has no answer records.
Authority
nmbrsapp.com. 3600 SOA ns1-05.azure-dns.com. dns.jomax.net. 2016050300 28800 7200 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0