Thank you everyone for your help, here's what my final code looks like that does what I need.

# Script to go through file and count the number of 
# times an ip appears;
use strict;
use warnings;

my $file = 'd:\temp\text.csv';
my %hash;

open (FILE, $file) or die "Can't open $file: $!\n";

while (<FILE>){
  my($src) = (split /,/)[1];
  $hash{$src}++;
}

foreach my $ip (sort({$hash{$b} <=> $hash{$a}} keys %hash)) {
  print "$ip appears $hash{$ip} times\n";
}
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