Question and response
Question
dig www.tetrain.com. NS
Answer
www.tetrain.com. 5 CNAME tetrain.com.
tetrain.com. 5 NS ns40.domaincontrol.com.
tetrain.com. 5 NS ns39.domaincontrol.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0