1. whois

2. history

fpu.ac.jp.              86400   IN      NS      dns4.fpu.ac.jp.
fpu.ac.jp.              86400   IN      NS      dns3.fpu.ac.jp.
fpu.ac.jp.              86400   IN      NS      dns.fpu.ac.jp.
fpu.ac.jp.              86400   IN      NS      dns2.fpu.ac.jp.

;; ADDITIONAL SECTION:
dns4.fpu.ac.jp.         86400   IN      A       202.238.55.52
dns3.fpu.ac.jp.         86400   IN      A       202.238.55.51
dns2.fpu.ac.jp.         86400   IN      A       157.6.16.2
dns.fpu.ac.jp.          86400   IN      A       157.6.16.3

51.55.238.202.in-addr.arpa. 3600 IN     PTR     202-238-055-051.pool.mitene.or.jp.
52.55.238.202.in-addr.arpa. 3600 IN     PTR     202-238-055-052.pool.mitene.or.jp.

$ dig -t ns fpu.ac.jp @202.238.55.51
;; communications error to 202.238.55.51#53: timed out
;; communications error to 202.238.55.51#53: timed out
;; communications error to 202.238.55.51#53: timed out

; <<>> DiG 9.18.12-0ubuntu0.22.04.1-Ubuntu <<>> -t ns fpu.ac.jp @202.238.55.51
;; global options: +cmd
;; no servers could be reached

tmaeno@conoha:~/jp/at/ns/in$ dig -t ns fpu.ac.jp @202.238.55.52
;; communications error to 202.238.55.52#53: timed out
;; communications error to 202.238.55.52#53: timed out
;; communications error to 202.238.55.52#53: timed out

; <<>> DiG 9.18.12-0ubuntu0.22.04.1-Ubuntu <<>> -t ns fpu.ac.jp @202.238.55.52
;; global options: +cmd
;; no servers could be reached

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