You might want to find information about a particular domain and check where it is hosted.
i.e.:
You could have a domain hosted by Godaddy and have your MX record hosted somewhere else. In this case with Dig command you can check where the DNS is.
dig racconlab.com NS
The result will be
; <<>> DiG 9.8.3-P1 <<>> racoonlab.com NS ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1939 ;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;racoonlab.com. IN NS ;; ANSWER SECTION: racoonlab.com. 21599 IN NS dns4.arubadns.cz. racoonlab.com. 21599 IN NS dns.technorail.com. racoonlab.com. 21599 IN NS dns3.arubadns.net. racoonlab.com. 21599 IN NS dns2.technorail.com. ;; Query time: 134 msec ;; SERVER: 192.168.86.1#53(192.168.86.1) ;; WHEN: Wed Dec 6 09:44:01 2017 ;; MSG SIZE rcvd: 140