dns4.pery.com has no CNAME records.
Question and response
Question
dig dns4.pery.com. NS
Answer
The response has no answer records.
Authority
pery.com. 457 SOA dns4.pery.com. certmgmt.pery.com. 999 21600 3600 1728000 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0