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Intro Linux Commands for DNS

DIG is used to query information about various DNS records, including host addresses, mail exchganges, and name servers, eg. « dig ».

Install dig on Linux (Optional)

Most modern Linux systems include the dig command.

Verify that it’s installed by checking the software version. To do so, open a command line and enter the following:

dig -v

The system should respond with a numeric code. If the system can’t find the command specified, install dig by entering the following:

Debian / Ubuntu:

sudo apt-get install dnsutils

CentOS / RedHat:

sudo yum install bind-utils

Once the installation finishes, verify the installation with the following command:

dig -v

How to Use the dig Command With Examples

Let’s look at the basic usage of the dig command.

Show canonical names (CNAMEs) or aliases that are associated with a domain name :

dig domain.tld cname

Show mail exchange records that are associated with a domaine name :

dig domain.tld mx

Show IPv6 addresses that are associated with a domain name :

dig domain.tld AAAA

Query a domain name associated with a specific IP address :

dig -x

Query for all records associated with a domaine name (A, AAAA, MX, NS, etc) :

host -v domain.tld 
host -a domain.tld

Configure system Domain Name System (DNS) resolver including local domain :

cat /etc/resolv.conf

Local listing of IP to hostnames. Takes precedence over DNS lookups :

cat /etc/hosts

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