Check your file and ensure that the ip address is actually in the eleventh semicolon delimited field. If not then $src will not contain the ip address.

This snippet skips them just fine.

use strict;
use warnings;

my $ignore = qr(192\.168\.188\.3|192\.168\.11\.141|192\.168\.140\.110|
+192\.168\.186\.192|192\.168\.186\.166|192\.168\.139\.50|192\.168\.139
+\.198|192\.168\.132\.101);

while (<DATA>){
   print if ($_ !~ /$ignore/);
}
__DATA__
192.168.188.3
192.168.11.141
192.168.140.110
192.168.186.192
192.168.186.166
192.168.139.50
192.168.139.198
192.168.132.101
192.168.188.4
192.168.11.142
192.168.140.111
192.168.186.193
192.168.186.167
192.168.139.51
192.168.139.199
192.168.132.102
[download]

Update: Aha! The qr needs the ip addresses all on one line. You have added whitespace in yours.