mx.cableone.net has no NS records.
NS records for this zone are defined at cableone.net.
NS records for this zone are defined at cableone.net.
Question and response
Question
dig mx.cableone.net. NS
Answer
The response has no answer records.
Authority
cableone.net. 300 SOA ns1.cableone.net. tech.cableone.net. 1899 300 300 300 300
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0