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+====== 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>

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