https://www.yuge.ac.jp
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