====== dig ======

  * [[DNS]]

  * [[http://alvinalexander.com/linux-unix/dig-commands-examples-tcp-ip-mx-record-dns|dig commands and examples]]

== Set defaults ==

You can use ''.digrc'' and store the same command line options in there to use as defaults.

Here, query Google's DNS server for lookups:

<code>
@8.8.8.8
</code>

Enable short output for all commands:

<code>
+short
</code>

== Lookup DNS records using nameservers ==

You should see similar results for a DNS lookup, using the different nameservers.

<code>
dig site.example.com @ns1.example.com
dig site.example.com @ns2.example.com
</code>

== Find the MX mail records ==

<code>
dig mx example.com
</code>

See also [[dnsmx]], which provides less verbosity.

== Find the TXT records ==

Can be used to display SPF entries.

<code>
dig txt example.com
</code>

See also [[dnstxt]].

== Check if DNS records match ==

Look for the serial numbers:

<code>
dig soa example.com @ns1.example.com
dig soa example.com @ns2.example.com
</code>

== Find the TTL for a domain ==

<code>
dig +nocmd domain.com +noall +answer
domain.com.	86353	IN	A	1.2.3.4
</code>

The first number is the TTL.  You can divide it by 360 to see how many hours are left.

== Find all the records ==

<code>
dig ANY domain.com
</code>

== Minimize output ==

<code>
dig ANY +noall +answer domain.com
</code>

== Reverse DNS lookups ==

<code>
dig -x 208.111.40.179
</code>