1. whois

wni.co.jp.              86400   IN      NS      gdns0.wni.co.jp.
wni.co.jp.              86400   IN      NS      gdns1.wni.co.jp.

;; ADDITIONAL SECTION:
gdns1.wni.co.jp.        86400   IN      A       202.12.8.8
gdns0.wni.co.jp.        86400   IN      A       211.14.5.194

2. history

$ dig -t ns wni.co.jp @202.12.8.8
gdns0.wni.co.jp.        900     IN      A       202.12.8.8
gdns1.wni.co.jp.        900     IN      A       35.72.208.199
gdns1.wni.co.jp.        900     IN      A       52.192.25.41

$ dig -t ns wni.co.jp @211.14.5.194
;; communications error to 211.14.5.194#53: timed out

194.5.14.211.in-addr.arpa. 41268 IN     CNAME   194.192/27.5.14.211.in-addr.arpa.

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