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; <<>> 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 （编辑：晋中站长网）
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