dbrwirnap01.dnb.com has no NS records.
NS records for this zone are defined at dnb.com.
NS records for this zone are defined at dnb.com.
Question and response
Question
dig dbrwirnap01.dnb.com. NS
Answer
The response has no answer records.
Authority
dnb.com. 3600 SOA primaryns.dnb.com. dnsadmin.dnb.com. 2021085016 1200 600 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0