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#!/usr/bin/perl
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use Socket;
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my $ADDR_PAT = /^\d+\.\d+\.\d+\.\d+$/;
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while (<>) {
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chomp;
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die "$_: Not a valid address" unless /$ADDR_PAT/o;
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my $name = gethostbyaddr(inet_aton($_),AF_INET);
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$name ||= '?';
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print "$_ => $name\n";
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}
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