You want to know all ip's for which the sent status occured, but not the created status. Here is one easy way. Use a bit for "created" and a bit for "sent" as values in a hash keyed on ip address. Print that key if only the "sent status" bit is set ("created" never occurred).

The scheme below can be expanded to any combination of "sent" and "created" that you need although the logic needs to change a bit if you want ip's that never had either "sent" or "created".

#!/usr/bin/perl

use strict;
use warnings;

my %hash;
my $sent_bits    = 1;  # binary 0001
my $created_bits = 2;  # binary 0010

while(<DATA>)
{
    next if /^\s*$/;  #skip blank lines
    my ($srcip, $action_field) = (split /\s+/,$_)[1,4];
    (my $action) = $action_field =~ m/^\[\d+\](\w+)/;

    $hash{$srcip} |= $sent_bits    if ($action eq "sent");
    $hash{$srcip} |= $created_bits if ($action eq "created");  
}

foreach my $sent_or_created (keys %hash)
{
    print "$sent_or_created\n" 
        if ($hash{$sent_or_created} == $sent_bits);
}

#prints: 192.168.7.16



__DATA__
ex100525.log:09:42:26 192.168.66.176 webcountry 192.168.0.166 [5933]cr
+eated /140NOE77111_V460_+IE38/FTP+script/put771.ftp 226 0
ex100525.log:09:42:27 192.168.66.176 webcountry 192.168.0.166 [5933]cr
+eated /140NOE77111_V460_+IE38/FTP+script/update_noe77111_module.doc 2
+26 0
ex100525.log:09:42:27 192.168.66.176 webcountry 192.168.0.166 [5933]cr
+eated /140NOE77111_V460_+IE38/FTP+script/upfwnoe.bat 226 0
ex100525.log:09:42:27 192.168.66.176 webcountry 192.168.0.166 [5933]CW
+D /140NOE77111_V460_+IE38/Release+Note 550 2
ex100525.log:09:42:27 192.168.66.176 webcountry 192.168.0.166 [5933]CW
+D /140NOE77111_V460_+IE38/Release+Note 250 0
ex100525.log:09:42:27 192.168.66.176 webcountry 192.168.0.166 [5933]se
+nt /140NOE77111_V460_+IE38/Release+Note/RN_140NOE77111_V46.doc 226 0
ex100525.log:09:42:27 192.168.7.16 webcountry 192.168.0.166 [5933]sent
+ /140NOE77111+V4.6/140NOE77111_V460_+IE38 250 0
ex100525.log:09:42:27 192.168.7.16 webcountry 192.168.0.166 [5933]CWD 
+/140NOE77111+V4.6/140NOE77111_V460_+IE38 250 0
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