Dig is a DNS lookup utility provided by ISC. This page is a simple web interface for dig.
$ dig b.root-servers.net
; <<>> DiG 9.11.3-1ubuntu1.13-Ubuntu <<>> b.root-servers.net
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13917
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;b.root-servers.net. IN A
;; ANSWER SECTION:
b.root-servers.net. 259199 IN A 199.9.14.201
;; Query time: 4 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Mon Sep 21 03:40:29 UTC 2020
;; MSG SIZE rcvd: 63