Ubuntu/Commands/dig

Commands | dig | Mail Server CLI | openssl

dig

dig (domain information groper) is a network administration command-line tool for querying Domain Name System (DNS) name servers.©
If you are missing dig from your Ubuntu installation, use this to install it.

~$ sudo apt-get install dnsutils

Command Syntax

dig [@server] [-t type] [-x addr]

[@server]

allows you to query a specific DNS server

[-t type]

allows you to query a specific type of DNS record, A,MX,PTR,CNAME,SOA,SRV,etc

[-x addr] or [-x]

performs a reverse lookup, matching address to name. The name has to be registered with .arpa in order for this to work.

Examples

$ dig -t a r00tedvw.com

; <<>> DiG 9.8.3-P1 <<>> -t a r00tedvw.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 47382
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;r00tedvw.com.			IN	A

;; AUTHORITY SECTION:
r00tedvw.com.		900	IN	SOA	ns21.domaincontrol.com. dns.jomax.net. 2013052201 28800 7200 604800 3600

;; Query time: 106 msec
;; SERVER: 10.45.57.101#53(10.45.57.101)
;; WHEN: Sun Apr 12 18:56:24 2015
;; MSG SIZE  rcvd: 98

$ dig -t mx earthlink.net

; <<>> DiG 9.8.3-P1 <<>> -t mx earthlink.net
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 18890
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 4

;; QUESTION SECTION:
;earthlink.net.			IN	MX

;; ANSWER SECTION:
earthlink.net.		1768	IN	MX	5 mx1.earthlink.net.
earthlink.net.		1768	IN	MX	5 mx2.earthlink.net.
earthlink.net.		1768	IN	MX	5 mx3.earthlink.net.
earthlink.net.		1768	IN	MX	5 mx4.earthlink.net.

;; ADDITIONAL SECTION:
mx1.earthlink.net.	1564	IN	A	209.86.93.226
mx2.earthlink.net.	1564	IN	A	209.86.93.227
mx3.earthlink.net.	1564	IN	A	209.86.93.228
mx4.earthlink.net.	1564	IN	A	209.86.93.229

;; Query time: 62 msec
;; SERVER: 10.45.57.101#53(10.45.57.101)
;; WHEN: Sun Apr 12 18:57:22 2015
;; MSG SIZE  rcvd: 175

$ dig -t srv _sip._tls.savvysaver.org

; <<>> DiG 9.8.5-P1 <<>> -t srv _sip._tls.savvysaver.org
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5579
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 2

;; QUESTION SECTION:
;_sip._tls.savvysaver.org.	IN	SRV

;; ANSWER SECTION:
_sip._tls.savvysaver.org. 3600	IN	SRV	100 1 443 sipdir.online.lync.com.

;; ADDITIONAL SECTION:
sipdir.online.lync.com.	300	IN	A	132.245.113.25
sipdir.online.lync.com.	300	IN	AAAA	2a01:111:f406:2400::10

;; Query time: 153 msec
;; SERVER: 10.45.57.101#53(10.45.57.101)
;; WHEN: Fri Apr 11 19:41:56 EDT 2014
;; MSG SIZE  rcvd: 128

$ dig @8.8.8.8 -t mx earthlink.net

; <<>> DiG 9.8.3-P1 <<>> @8.8.8.8 -t mx earthlink.net
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 54589
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;earthlink.net.			IN	MX

;; ANSWER SECTION:
earthlink.net.		1710	IN	MX	5 mx3.earthlink.net.
earthlink.net.		1710	IN	MX	5 mx4.earthlink.net.
earthlink.net.		1710	IN	MX	5 mx1.earthlink.net.
earthlink.net.		1710	IN	MX	5 mx2.earthlink.net.

;; Query time: 33 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Sun Apr 12 19:02:38 2015
;; MSG SIZE  rcvd: 111