1. whois

yuge.ac.jp.             86400   IN      NS      ns2-02.azure-dns.net.
yuge.ac.jp.             86400   IN      NS      ns1-02.azure-dns.com.
yuge.ac.jp.             86400   IN      NS      fw1.yuge.ac.jp.
yuge.ac.jp.             86400   IN      NS      dns-x.sinet.ad.jp.
yuge.ac.jp.             86400   IN      NS      ns4-02.azure-dns.info.
yuge.ac.jp.             86400   IN      NS      ns3-02.azure-dns.org.

;; ADDITIONAL SECTION:
fw1.yuge.ac.jp.         86400   IN      A       160.245.112.1

2. history

$ dig -t ns yuge.ac.jp @dns-x.sinet.ad.jp.   SERVFAIL

$ dig -t ns yuge.ac.jp @160.245.112.1
;; communications error to 160.245.112.1#53: timed out
;; communications error to 160.245.112.1#53: timed out
;; communications error to 160.245.112.1#53: timed out

; <<>> DiG 9.18.12-0ubuntu0.22.04.1-Ubuntu <<>> -t ns yuge.ac.jp @160.245.112.1
;; global options: +cmd
;; no servers could be reached

1 160.245.0.0 - 160.245.255.255 Yuge National College of Maritime Technology 160.245.6.150 08 Feb 2023, 02:03

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