If I understand your quandry correctly, you need a composite key made up of both LOGON and IP:

use strict;

my $bag;

while(<DATA>)
{
  chomp;
  my @data = split;
  if(exists $bag->{"$data[0] -- $data[1]"})
  {
    $bag->{"$data[0] -- $data[1]"}->[0]++;
  }
  else
  {
    $bag->{"$data[0] -- $data[1]"} = [1, @data];
  }
}

print("  LOGON  --           IP      --  CNT ........\n");

while(my($key,$value) = each(%$bag))
{
  my ($count, $login, $ip) = @$value;
  printf("%8s -- %17s -- %04d ...\n", $login, $ip, $count);
}

__DATA__
xzc6548 192.168.10.5
xzc6548 192.168.10.5
xzc6548 192.168.10.10
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UPDATE: Changed some strange line endings.