use of dig command in centos

dig command is a very useful DNS lookup utility. It can be used to retrieve DNS records information of any domain name by querying specifc DNS servers. It is also a great troubleshooting tool for any admin configuring or troubleshooting existing DNS server.

To retrieve domain MX records simply use MX option in combination to domain name you wish to query. For example the below command will query MX records for boobi.com:

[root@mail ~]# dig boobi.com mx

; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.62.rc1.el6_9.4 <<>> boobi.com mx
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 53205
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 2

;; QUESTION SECTION:
;boobi.com.                     IN      MX

;; ANSWER SECTION:
boobi.com.              86400   IN      MX      0 mail.boobi.com.

;; AUTHORITY SECTION:
boobi.com.              86400   IN      NS      ns1.boobi.com.

;; ADDITIONAL SECTION:
mail.boobi.com.         86400   IN      A       192.168.1.115
ns1.boobi.com.          86400   IN      A       192.168.1.115

;; Query time: 1 msec
;; SERVER: 192.168.1.115#53(192.168.1.115)
;; WHEN: Wed Aug  9 17:22:00 2017
;; MSG SIZE  rcvd: 98