gtd03-d.ashburn.va.ndcasbn.comcast.net has no NS records.
NS records for this zone are defined at ashburn.va.ndcasbn.comcast.net.
NS records for this zone are defined at ashburn.va.ndcasbn.comcast.net.
Question and response
Question
dig gtd03-d.ashburn.va.ndcasbn.comcast.net. NS
Answer
The response has no answer records.
Authority
ashburn.va.ndcasbn.comcast.net. 900 SOA dns101.comcast.net. hostmaster.ashburn.va.ndcasbn.comcast.net. 2012126630 7200 3600 604800 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0