dns3.pery.com has no CNAME records.
Question and response
Question
dig dns3.pery.com. NS
Answer
The response has no answer records.
Authority
pery.com. 724 SOA dns4.pery.com. certmgmt.pery.com. 999 21600 3600 1728000 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0