zimbra.pimec.net has no NS records.
NS records for this zone are defined at pimec.net.
NS records for this zone are defined at pimec.net.
Question and response
Question
dig zimbra.pimec.net. NS
Answer
The response has no answer records.
Authority
pimec.net. 38400 SOA dns01.pimec.net. dominis.pimec.net. 1616575078 10800 3600 604800 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0