Dig is a DNS lookup utility provided by ISC. This page is a simple web interface for dig.
$ dig gdsys.co.kr ; <<>> DiG 9.11.3-1ubuntu1.3-Ubuntu <<>> gdsys.co.kr ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 12085 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;gdsys.co.kr. IN A ;; ANSWER SECTION: gdsys.co.kr. 3600 IN A 183.86.221.26 ;; AUTHORITY SECTION: gdsys.co.kr. 3600 IN NS ns2.hostingworld.co.kr. gdsys.co.kr. 3600 IN NS ns.hostingworld.co.kr. ;; Query time: 823 msec ;; SERVER: 139.162.69.5#53(139.162.69.5) ;; WHEN: Mon Dec 10 00:33:31 UTC 2018 ;; MSG SIZE rcvd: 104