Slookup for Linux is a simple program to do parallelized DNS lookups in a convenient way (useful for log parsing scripts and one-liners). It reads names (A/MX/NS lookups) or addresses (in dotted-quad format for PTR) on stdin and writes the results on stdout. One record per line. It can run up to 128 parallel DNS lookup processes (easily overloading a slow DNS server) which makes for Really Fast lookups for a large number of records. Beware, output is written in the order the DNS replies are received, which is usually different from the input order if parallel lookups are done.
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