10 Linux DIG Command Examples for DNS Lookup--reference

; <<>> DiG 9.7.3-RedHat-9.7.3-2.el6 <<>> redhat.com NS +noall +answer
;; global options: +cmd
redhat.com. 558 IN NS ns2.redhat.com.
redhat.com. 558 IN NS ns1.redhat.com.
redhat.com. 558 IN NS ns3.redhat.com.
redhat.com. 558 IN NS ns4.redhat.com.

You can also use option -t to pass the query type (for example: NS) as shown below.

$ dig -t NS redhat.com +noall +answer
; <<>> DiG 9.7.3-RedHat-9.7.3-2.el6 <<>> -t NS redhat.com +noall +answer

;; global options: +cmd

redhat.com.             543     IN      NS      ns4.redhat.com.

redhat.com.             543     IN      NS      ns1.redhat.com.

redhat.com.             543     IN      NS      ns3.redhat.com.

redhat.com.             543     IN      NS      ns2.redhat.com.

5. View ALL DNS Records Types Using dig -t ANY

To view all the record types (A,MX,NS,etc.),use ANY as the record type as shown below.

$ dig redhat.com ANY +noall +answer
; <<>> DiG 9.7.3-RedHat-9.7.3-2.el6 <<>> redhat.com ANY +noall +answer

;; global options: +cmd

redhat.com.             430     IN      MX      5 mx1.redhat.com.

redhat.com.             430     IN      MX      10 mx2.redhat.com.

redhat.com.             521     IN      NS      ns3.redhat.com.

redhat.com.             521     IN      NS      ns1.redhat.com.

redhat.com.             521     IN      NS      ns4.redhat.com.

redhat.com.             521     IN      NS      ns2.redhat.com.

(or) Use -t ANY

$ dig -t ANY redhat.com  +noall +answer
; <<>> DiG 9.7.3-RedHat-9.7.3-2.el6 <<>> -t ANY redhat.com +noall +answer

;; global options: +cmd

redhat.com.             367     IN      MX      10 mx2.redhat.com.

redhat.com.             367     IN      MX      5 mx1.redhat.com.

redhat.com.             458     IN      NS      ns4.redhat.com.

redhat.com.             458     IN      NS      ns1.redhat.com.

redhat.com.             458     IN      NS      ns2.redhat.com.

redhat.com.             458     IN      NS      ns3.redhat.com.

6. View Short Output Using dig +short

To view just the ip-address of a web site (i.e the A record),use the short form option as shown below.

$ dig redhat.com +short
209.132.183.81

You can also specify a record type that you want to view with the +short option.

$ dig redhat.com ns +short
ns2.redhat.com.
ns3.redhat.com.
ns1.redhat.com.
ns4.redhat.com.

7. DNS Reverse Look-up Using dig -x

To perform a DNS reverse look up using the ip-address using dig -x as shown below

For example,if you just have an external ip-address and would like to know the website that belongs to it,do the following.

$ dig -x 209.132.183.81 +short
www.redhat.com.

To view the full details of the DNS reverse look-up,remove the +short option.

$ dig -x 209.132.183.81
; <<>> DiG 9.7.3-RedHat-9.7.3-2.el6 <<>> -x 209.132.183.81

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY,id: 62435

;; flags: qr rd ra; QUERY: 1,ADDITIONAL: 3
;; QUESTION SECTION:

;81.183.132.209.in-addr.arpa.   IN      PTR
;; ANSWER SECTION:

81.183.132.209.in-addr.arpa. 600 IN     PTR     www.redhat.com.
;; AUTHORITY SECTION:

183.132.209.in-addr.arpa. 248   IN      NS      ns2.redhat.com.

183.132.209.in-addr.arpa. 248   IN      NS      ns1.redhat.com.

183.132.209.in-addr.arpa. 248   IN      NS      ns3.redhat.com.

183.132.209.in-addr.arpa. 248   IN      NS      ns4.redhat.com.
;; ADDITIONAL SECTION:

ns1.redhat.com.         363     IN      A       209.132.186.218

ns2.redhat.com.         363     IN      A       209.132.183.2

ns3.redhat.com.         363     IN      A       209.132.176.100
;; Query time: 35 msec

;; SERVER: 209.144.50.138#53(209.144.50.138)

;; WHEN: Thu Jan 12 10:15:00 2012

;; MSG SIZE  rcvd: 193

8. Use a Specific DNS server Using dig @dnsserver

By default dig uses the DNS servers defined in your /etc/resolv.conf file.

If you like to use a different DNS server to perform the query,specify it in the command line as @dnsserver.

The following example uses ns1.redhat.com as the DNS server to get the answer (instead of using the DNS servers from the /etc/resolv.conf file).

$ dig @ns1.redhat.com redhat.com
; <<>> DiG 9.7.3-RedHat-9.7.3-2.el6 <<>> @ns1.redhat.com redhat.com

; (1 server found)

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY,id: 20963

;; flags: qr aa rd; QUERY: 1,ADDITIONAL: 4

;; WARNING: recursion requested but not available
;; QUESTION SECTION:

;redhat.com.                    IN      A
;; ANSWER SECTION:

redhat.com.             60      IN      A       209.132.183.81
                        
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