Mr. Muskrat has found the immediate solution. For your next attempt, let me suggest some improvement in your code, so that it becomes more readable and easier to maintain.

my @ips = (qw(
    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 ));


my $ignore = join "|", @ips;

while (<FILE>){
   print unless /$ignore/;
}

# -----------------------

sub ignore {
    my $ip = shift;
    for (@ips) {
        return 1 if $ip =~ $_
    }
    return 0;
}

while (<FILE>) {
    print unless ignore($_)
}
[download]

The first method creates a regular expression from an array. You can add to an array (or delete) much easier than editing such a complicated regex.

The second example uses a subroutine that, depending on the number of your IPs to ignore, can be much quicker than a regex with alternation.

HTH