in reply to Counting unique instances from Array Sort
my %ip_count; ++$ip_count{$_} for (@ipAddresses); [download]
my @ipAddresses = ("172.16.16.1 ", "172.16.16.1 ", "172.16.16.1 ", "17 +2.16.16.2 "); [download]
172.16.16.1,3 172.16.16.2,1 [download]