dig is a network administration command-line tool for querying the Domain Name System (DNS).

When a specific name server is not specified in the command invocation, it uses the operating system's default resolver, usually configured in the file resolv.conf.

dig is a component of the domain name server software suite BIND.

dig was originally written by Steve Hotz and incorporated into BIND 4 since at least 1990;[3] later it was rewritten by Michael Sawyer, and is maintained by the Internet Systems Consortium as part of BIND 9.

When originally written, the manual page for dig indicated that its name was an acronym for "Domain Information Groper".