123.64-26.8.30.115.in-addr.arpa has no NS records.
NS records for this zone are defined at 8.30.115.in-addr.arpa.
NS records for this zone are defined at 8.30.115.in-addr.arpa.
Question and response
Question
dig 123.64-26.8.30.115.in-addr.arpa. NS
Answer
The response has no answer records.
Authority
8.30.115.in-addr.arpa. 300 SOA ns2.bit-isle.co.jp. root.bit-isle.co.jp. 2015021200 3600 1800 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0