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Dig - Domain Information Groper
A flexible tool for interrogating DNS name servers. It performs DNS lookups and displays the answers that are returned from the nameserver(s) that were queried. Most DNS administra tors use dig to troubleshoot DNS problems because of its flexibility, ease of use and clarity of output. Other lookup tools tend to have less functionality than dig. Although dig is normally used with command-line arguments, it also has a batch mode of operation for reading lookup requests from a file.