The full form of DIG is Domain Information Groper. A DIG lookup is used for performing the DNS lookups and then providing answers to the name server from which the query is received.
If we put forward the definition of DIG in simple words, it can be said that DIG lookup is a command line tool which is used for sending queries to DNS Name Servers for the complete information related to mail exchange, name servers and host addresses. The source code for a DIG look up is a relatively bigger than the ISC bind distribution. A DIG lookup can be used for network troubleshooting as well as for various educational purposes.
Complete Description of DIG Lookup
Almost all DNS administrators make use of a DIG lookup to perform troubleshooting as with this they can adopt a clear and result oriented approach. It has been observed that various other lookups tend to be less efficient. As DIG lookup is usually used in conjunction with the command line arguments, they have a batch mode of operation which is used for reading lookups from any specific file.
A DIG Lookup Invocation
The two major components of a DIG lookup invocation are server and name type. Server is the name of the Name Server. Server can also be the IP address of the name server at the time of a query. Whenever a given server argument comes out to be a host name, a DIG lookup resolves the name before it queries the Name Server. In case there is no server argument provided, then DIG consults the config files and then it queries the name servers present in them.
Name is the name of the resource record which is being looked up. The Type defines the type of query required for lookup. The valid query types are ANY, A, MX, SIG and others.
Query Options for DIG Lookup
In a DIG lookup, various query options are available which directly affect the manner in which lookups are performed and the results are displayed. Many of these query options either set or reset the flag bits in the header of the query. Each and every query option of a DIG lookup is identified with the help of a keyword and is preceded by the symbol (+). The general format is (“+Keyword=
DIG Lookup also supports multiple queries and these queries can be specified in a single command line. All these queries are provided with a set of flags, query options and general options. With multiple queries of DIG lookup, variety of results are probable such as short answers, long answers, different nameservers, bulk lookups and the reverse lookup tables.
It can be said that with the use of DIG lookup, it becomes quite easy to collect the information regarding the nameservers and that too in a fast and effective way.
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