mx01-lma.coppernet.net has no NS records.
NS records for this zone are defined at coppernet.net.
NS records for this zone are defined at coppernet.net.
Question and response
Question
dig mx01-lma.coppernet.net. NS
Answer
The response has no answer records.
Authority
coppernet.net. 86400 SOA ns1.coppernet.net. support.coppernet.net. 338 10800 3600 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0