mx2.admincollaborationservices.etb.net.co has no NS records.
NS records for this zone are defined at admincollaborationservices.etb.net.co.
NS records for this zone are defined at admincollaborationservices.etb.net.co.
Question and response
Question
dig mx2.admincollaborationservices.etb.net.co. NS
Answer
The response has no answer records.
Authority
admincollaborationservices.etb.net.co. 900 SOA ns1-auth.etb.net.co. postmaster.etb.net.co. 14 10800 3600 2419200 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0