mtl02vnszs07.srvr.bell.ca has no NS records.
NS records for this zone are defined at srvr.bell.ca.
NS records for this zone are defined at srvr.bell.ca.
Question and response
Question
dig mtl02vnszs07.srvr.bell.ca. NS
Answer
The response has no answer records.
Authority
srvr.bell.ca. 900 SOA tor63vnszp08.srvr.bell.ca. dns-admin.bellglobal.com. 9640 10800 3600 2419200 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0