Dig is a DNS lookup utility provided by ISC. This page is a simple web interface for dig.
$ dig f.root-servers.net ; <<>> DiG 9.11.3-1ubuntu1.2-Ubuntu <<>> f.root-servers.net ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 59574 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 13, ADDITIONAL: 26 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;f.root-servers.net. IN A ;; ANSWER SECTION: f.root-servers.net. 3336806 IN A 192.5.5.241 ;; AUTHORITY SECTION: root-servers.net. 280836 IN NS l.root-servers.net. root-servers.net. 280836 IN NS e.root-servers.net. root-servers.net. 280836 IN NS b.root-servers.net. root-servers.net. 280836 IN NS c.root-servers.net. root-servers.net. 280836 IN NS h.root-servers.net. root-servers.net. 280836 IN NS j.root-servers.net. root-servers.net. 280836 IN NS a.root-servers.net. root-servers.net. 280836 IN NS i.root-servers.net. root-servers.net. 280836 IN NS m.root-servers.net. root-servers.net. 280836 IN NS g.root-servers.net. root-servers.net. 280836 IN NS f.root-servers.net. root-servers.net. 280836 IN NS d.root-servers.net. root-servers.net. 280836 IN NS k.root-servers.net. ;; ADDITIONAL SECTION: a.root-servers.net. 3276767 IN A 198.41.0.4 b.root-servers.net. 3281117 IN A 199.9.14.201 c.root-servers.net. 3343515 IN A 192.33.4.12 d.root-servers.net. 3336767 IN A 199.7.91.13 e.root-servers.net. 3429125 IN A 192.203.230.10 g.root-servers.net. 3463531 IN A 192.112.36.4 h.root-servers.net. 3296989 IN A 198.97.190.53 i.root-servers.net. 3447055 IN A 192.36.148.17 j.root-servers.net. 3320384 IN A 192.58.128.30 k.root-servers.net. 3336775 IN A 193.0.14.129 l.root-servers.net. 3444726 IN A 199.7.83.42 m.root-servers.net. 3292121 IN A 202.12.27.33 a.root-servers.net. 3458638 IN AAAA 2001:503:ba3e::2:30 b.root-servers.net. 3292119 IN AAAA 2001:500:200::b c.root-servers.net. 3349829 IN AAAA 2001:500:2::c d.root-servers.net. 3447050 IN AAAA 2001:500:2d::d e.root-servers.net. 3291949 IN AAAA 2001:500:a8::e f.root-servers.net. 3336796 IN AAAA 2001:500:2f::f g.root-servers.net. 3276036 IN AAAA 2001:500:12::d0d h.root-servers.net. 3417393 IN AAAA 2001:500:1::53 i.root-servers.net. 3417396 IN AAAA 2001:7fe::53 j.root-servers.net. 3336788 IN AAAA 2001:503:c27::2:30 k.root-servers.net. 3429136 IN AAAA 2001:7fd::1 l.root-servers.net. 3336771 IN AAAA 2001:500:9f::42 m.root-servers.net. 3292122 IN AAAA 2001:dc3::35 ;; Query time: 1 msec ;; SERVER: 139.162.69.5#53(139.162.69.5) ;; WHEN: Fri Oct 19 20:57:53 UTC 2018 ;; MSG SIZE rcvd: 825