dns4.pery.com has no NS records.
NS records for this zone are defined at pery.com.
NS records for this zone are defined at pery.com.
Question and response
Question
dig dns4.pery.com. NS
Answer
The response has no answer records.
Authority
pery.com. 900 SOA dns4.pery.com. certmgmt.pery.com. 999 21600 3600 1728000 900
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0