mailsender112.xserver.jp has no NS records.
NS records for this zone are defined at xserver.jp.
NS records for this zone are defined at xserver.jp.
Question and response
Question
dig mailsender112.xserver.jp. NS
Answer
The response has no answer records.
Authority
xserver.jp. 3600 SOA ns1.xserver.jp. root.sv0.xserver.jp. 0 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0