Question and response
Question
dig ns7.neustar.com. NS
Answer
ns7.neustar.com. 5 CNAME mx2.neustar.com.
Authority
neustar.com. 10800 SOA udns1.ultradns.net. networkers.neustar.biz. 1311363932 86400 86400 86400 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0