a-0010.a-msedge.net has no CNAME records.
Question and response
Question
dig a-0010.a-msedge.net. NS
Answer
The response has no answer records.
Authority
a-msedge.net. 225 SOA ns1.a-msedge.net. msnhst.microsoft.com. 2016092901 1800 900 2419200 240
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0