Following is a PERL script that reads an input file of IP's and port ranges. I then checks each port to see if they are open. It works as written. The problem I have is I want to know if the port is OPEN (Lisntened) Closed (no app has it open) Blocked (the firewall will not allow me to open it) Adjusting the attached code is there a way to better check the PORT state so I can recognize all three states? I am not an experienced PERL coder but been coding lots of different languages for years. I just don't know what to check to get the port state. Thanks for any help you can offer. 
#!/usr/local/bin/perl
# ####################################################################
# SINGLE THREAD PERL PORT SCANNER
# Modified from FORK PERL PORT SCANNER By Jonathan Worthington
# This script is made available under the sames terms as Perl itself.
# ####################################################################
+ 

use strict;
use warnings;
use IO::Socket::INET;
my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime(t
+ime);     
$year += 1900;
print "Port Scan for IRN  $mon/$mday/$year  $hour:$min:$sec \n";
my $iFile = $ARGV[0];
open(INPUT, '<', $iFile) or die $!;
while (<INPUT>) {
    my $hostIp    = substr($_, 0, 14);
    my $hostName  = substr($_, 18, 7);
  my $portStart = substr($_, 26, 5);
  my $portTimes = substr($_, 32, 5);
#Auto-flush.
$| = 1;


#Port scan host.
print "Scanning $hostName, $hostIp, Port $portStart for $portTimes num
+ber of Ports \n";
my $port;
my $endPort = $portStart+$portTimes - 1;
for ($port=$portStart; $port<=$endPort; $port++) {
    
    #Attempt to connect to $host on $port.
    my $socket;
    my $success = eval {
         #local $SIG{'ALRM'} = sub { die "Timed out" };
         #alarm(1); 
         $socket = IO::Socket::INET->new(
            PeerAddr     => $hostIp, 
            PeerPort     => $port, 
            Proto     => 'tcp',
            Timeout => "1"
        ) 
    };
            
    #If the port was opened, say it was and close it.
    if ($success) {
        print "Host $hostName  Port $port: Open\n";
        shutdown($socket, 2);
     } else {    
          print "Host $hostName Port $port:  NOT Open\n";
    }
    
 } 
}
close INPUT;
print " \n";
print "*************************************************** \n";
print "Port Scan for IRN  is COMPLETE on this segment      \n";
print "*************************************************** \n";

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In reply to check blocked ports by rdkeith830

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