mx4.stcable.net has no NS records.
NS records for this zone are defined at stcable.net.
NS records for this zone are defined at stcable.net.
Question and response
Question
dig mx4.stcable.net. NS
Answer
The response has no answer records.
Authority
stcable.net. 7200 SOA bind-1.sattrakt.net. webmaster.stcable.net. 2009042831 10800 3600 604800 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0