2.0-127.207.231.202.in-addr.arpa has no NS records.
NS records for this zone are defined at 0-127.207.231.202.in-addr.arpa.
NS records for this zone are defined at 0-127.207.231.202.in-addr.arpa.
Question and response
Question
dig 2.0-127.207.231.202.in-addr.arpa. NS
Answer
The response has no answer records.
Authority
0-127.207.231.202.in-addr.arpa. 600 SOA nsx1.mitene.ad.jp. postmaster.po.mitene.or.jp. 100028 7200 1800 1209600 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0