放棄?
1. whois
toyota-gk.ac.jp. 86400 IN NS ns1.bit-drive.ne.jp. toyota-gk.ac.jp. 86400 IN NS dns.toyota-gk.ac.jp. ;; ADDITIONAL SECTION: dns.toyota-gk.ac.jp. 86400 IN A 211.9.37.138
138.37.9.211.in-addr.arpa. 86400 IN PTR 211-9-37-138.cust.bit-drive.ne.jp.
2. history
$ dig -t ns toyota-gk.ac.jp @211.9.37.138 ;; communications error to 211.9.37.138#53: timed out ;; communications error to 211.9.37.138#53: timed out ;; communications error to 211.9.37.138#53: timed out ; <<>> DiG 9.18.12-0ubuntu0.22.04.1-Ubuntu <<>> -t ns toyota-gk.ac.jp @211.9.37.138 ;; global options: +cmd ;; no servers could be reached