mx4.azureit.se has no NS records.
NS records for this zone are defined at azureit.se.
NS records for this zone are defined at azureit.se.
Question and response
Question
dig mx4.azureit.se. NS
Answer
The response has no answer records.
Authority
azureit.se. 14400 SOA ns1.coreit.se. registry.coreit.se. 2015121141 21600 10800 1209600 14400
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0