Not sure if I understand what you want to do. But here is my try.  script.pl < path.csv 
use strict;
use warnings;
my %h;
while (<>) {
  my ( $k, @ips ) = split /\s+/;
  $k =~ s/(_.*)$//;
  $h{$k}{$_}++ for @ips;
}
for my $srv ( sort keys %h ) {
  for ( sort keys %{ $h{$srv} } ) {
    printf( "%10s %15s %6s\n", $srv, $_, $h{$srv}{$_} );
  }
}

[download]
__OUTPUT__
   11BT801    10.197.28.38      1
   11BT801     10.197.5.82      2
   11BT801    10.200.10.10      1
   11BT801    10.200.10.11      1
   11BT801     10.200.6.42      2
   11BT801     10.200.6.50      1
   11BT801     10.200.8.26      2
   12GT601     10.100.7.14      1
   12GT601     10.100.9.16      2
   12GT601     10.160.9.16      1
   12GT601     10.180.7.13      1
   12GT601    10.197.27.36      1
   12GT601     10.197.5.82      2
   12GT601    10.200.10.10      1
   12GT601     10.200.5.40      2

[download]
Boris

In reply to Re: Tally up the number of times each IP shows up in the file and load into HASH by borisz
in thread count the number of IP shows up in the file by sgowrish

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