216.192.30.163.210.in-addr.arpa has no NS records.
NS records for this zone are defined at 192.30.163.210.in-addr.arpa.
NS records for this zone are defined at 192.30.163.210.in-addr.arpa.
Question and response
Question
dig 216.192.30.163.210.in-addr.arpa. NS
Answer
The response has no answer records.
Authority
192.30.163.210.in-addr.arpa. 1200 SOA ns6-tk01.ocn.ad.jp. root.ocn.ad.jp. 2026011601 86400 3600 604800 1200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0