http://www.e-ontap.com/dns/openresolver/
1. whois
kedge.edu. 172800 IN NS ns0.kedge.edu. kedge.edu. 172800 IN NS ns1.kedge.edu. kedge.edu. 172800 IN NS ns3.kedge.edu. ;; ADDITIONAL SECTION: ns0.kedge.edu. 172800 IN A 195.220.8.21 ns1.kedge.edu. 172800 IN A 77.159.248.73 ns3.kedge.edu. 172800 IN A 193.54.215.241 ;; Query time: 163 msec ;; SERVER: 192.5.6.30#53(a.edu-servers.net) (UDP) ;; WHEN: Mon May 15 06:44:00 JST 2023 ;; MSG SIZE rcvd: 153
2. history
$ dig -t ns kedge.edu @195.220.8.21 ;; communications error to 195.220.8.21#53: timed out ;; communications error to 195.220.8.21#53: timed out