Dig command linux / unix examples

Hey,

So, what is DIG command used for? Well, for those who are not familiar DIG is a tool to perform DNS lookups. It has a lot of switches to find out details about the DNS record we are looking for. It is a pretty straight and direct command line utility to find DNS Records *if you know the switch to use*. So lets skip the introductions and check them out ūüôā

Simply using the dig command followed by a domain name returns the A record of the domain.

[email protected]:~$¬†dig example.com

Example:

[email protected]:~$¬†dig learntutors.com


; <<>> DiG 9.9.5-3ubuntu0.6-Ubuntu <<>> learntutors.com

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 11391

;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1


;; OPT PSEUDOSECTION:

; EDNS: version: 0, flags:; udp: 4096

;; QUESTION SECTION:

;learntutors.com. IN A


;; ANSWER SECTION:

learntutors.com. 300 IN A 104.28.13.115

learntutors.com. 300 IN A 104.28.12.115


;; Query time: 105 msec

;; SERVER: 127.0.1.1#53(127.0.1.1)

;; WHEN: Thu Dec 17 10:59:27 IST 2015

;; MSG SIZE rcvd: 76

2) To find MX (Mail eXchanger) record:

[email protected]:~$¬†dig -t MX example.com

Example:

[email protected]:~$¬†¬†dig -t MX learntutors.com


; <<>> DiG 9.9.5-3ubuntu0.6-Ubuntu <<>> -t MX learntutors.com

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 25062

;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1


;; OPT PSEUDOSECTION:

; EDNS: version: 0, flags:; udp: 4096

;; QUESTION SECTION:

;learntutors.com. IN MX


;; ANSWER SECTION:

learntutors.com. 300 IN MX 20 mx2.zoho.com.

learntutors.com. 300 IN MX 50 mx3.zoho.com.

learntutors.com. 300 IN MX 10 mx.zoho.com.


;; Query time: 190 msec

;; SERVER: 127.0.1.1#53(127.0.1.1)

;; WHEN: Thu Dec 17 11:05:13 IST 2015

;; MSG SIZE rcvd: 108

3.  Find Name Servers of a domain

[email protected]:~$¬†dig -t NS¬†example.com

Example:

[email protected]:~$¬†dig -t NS learntutors.com


; <<>> DiG 9.9.5-3-Ubuntu <<>> -t NS learntutors.com

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 17347

;; flags: qr rd ra ad; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1


;; OPT PSEUDOSECTION:

; EDNS: version: 0, flags:; udp: 512

;; QUESTION SECTION:

;learntutors.com. IN NS


;; ANSWER SECTION:

learntutors.com. 21599 IN NS greg.ns.cloudflare.com.

learntutors.com. 21599 IN NS brenda.ns.cloudflare.com.


;; Query time: 253 msec

;; SERVER: 8.8.8.8#53(8.8.8.8)

;; WHEN: Thu Dec 17 14:22:50 IST 2015

;; MSG SIZE rcvd: 98

4. To find SOA Records

[email protected]:~$¬†dig -t SOA example.com

Example:

[email protected]:~$¬†dig -t SOA learntutors.com


; <<>> DiG 9.9.5-3-Ubuntu <<>> -t SOA learntutors.com

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 32705

;; flags: qr rd ra ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1


;; OPT PSEUDOSECTION:

; EDNS: version: 0, flags:; udp: 512

;; QUESTION SECTION:

;learntutors.com. IN SOA


;; ANSWER SECTION:

learntutors.com. 21599 IN SOA brenda.ns.cloudflare.com. dns.cloudflare.com. 2020142160 10000 2400 604800 3600


;; Query time: 173 msec

;; SERVER: 8.8.8.8#53(8.8.8.8)

;; WHEN: Thu Dec 17 14:25:19 IST 2015

;; MSG SIZE rcvd: 105

5.  To find TXT Records

[email protected]:~$¬†dig -t TXT example.com

Example:

[email protected]:~$¬†dig -t TXT learntutors.com


; <<>> DiG 9.9.5-3-Ubuntu <<>> -t TXT learntutors.com

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 54437

;; flags: qr rd ra ad; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1


;; OPT PSEUDOSECTION:

; EDNS: version: 0, flags:; udp: 512

;; QUESTION SECTION:

;learntutors.com. IN TXT


;; ANSWER SECTION:

learntutors.com. 29 IN TXT “google-site-verification=ooCm8t9CMpIutAQpCVpZxsK3pkfIoint36vKLYqPcSs”

learntutors.com. 29 IN TXT “v=spf1 a mx ip4:192.186.245.100 ip4:198.252.101.197 include:servers.mcsv.net include:_spf.google.com include:zoho.com ~all”


;; Query time: 158 msec

;; SERVER: 8.8.8.8#53(8.8.8.8)

;; WHEN: Thu Dec 17 14:34:14 IST 2015

;; MSG SIZE rcvd: 260

6. To find ALL records of a Domain

[email protected]:~$ dig -t ANY example.com

Now instead of getting the whole output, to print out only the answer part, add +short at the end of the command.
Example:

[email protected]:~$¬†dig -t A learntutors.com +short


104.28.12.115

104.28.13.115 /

[email protected]:~$¬†dig -t MX learntutors.com +short


20 mx2.zoho.com.

50 mx3.zoho.com.

10 mx.zoho.com.

Or the same short answer can be viewed appending¬†| exec sed -n ‘/QUESTION/,/Query/p’¬†to the end of the dig command. What it does is that it prints all lines between the QUESTION and ANSWER SECTION of the output.

[email protected]:¬†~$¬†dig -t SOA learntutors.com¬†| exec sed -n ‘/QUESTION/,/Query/p’

;; QUESTION SECTION:

;learntutors.com. IN SOA


;; ANSWER SECTION:

learntutors.com. 21599 IN SOA brenda.ns.cloudflare.com. dns.cloudflare.com. 2020142160 10000 2400 604800 3600


;; Query time: 165 msec

The choice of command depends on your personal preference as basically all it does is the same, its just the presentation which is different

You may also like...

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.