c32-c.ismtp.allstream.net has no CNAME records.
Question and response
Question
dig c32-c.ismtp.allstream.net. NS
Answer
The response has no answer records.
Authority
allstream.net. 2129 SOA nsx.integraonline.com. itops.zayo.com. 2026030601 300 7200 604800 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0