Presuming your input data's of a reasonable size you probably could skip the postprocessing and instead sort and uniq'ify your data yourself.

#!/usr/bin/perl
use strict;
use warnings;
use Regexp::Common qw(net);
use String::Util qw(trim);

my %seen_addrs;

while (<>) {
    /$RE{net}{IPv4}{-keep}/                                and $seen_a
+ddrs{ trim($1) }++;
    /$RE{net}{IPv6}{-sep => ':'}{-style => 'HeX'}{-keep}/  and $seen_a
+ddrs{ trim($1) }++;
    /$RE{net}{MAC}{-keep}/                                 and $seen_a
+ddrs{ trim($1) }++;
}

for my $addr ( sort keys %seen_addrs ) {
  print $addr, qq{\n};
}
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