dig
System software
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dig is a network administration command-line tool for querying the Domain Name System.
dig is useful for network troubleshooting and for educational purposes. It can operate based on command line option and flag arguments, or in batch mode by... Wikipedia
Developer(s): Internet Systems Consortium (originally Computer Systems Research Group)
License: Mozilla Public License (ISC license before 9.11)
Original author(s): Steve Hotz, Michael Sawyer