diff --git a/iputils.pm b/iputils.pm
new file mode 100644
index 0000000..41ee15c
--- /dev/null
+++ b/iputils.pm
@@ -0,0 +1,135 @@
+#!/bin/env perl
+#
+# Author: soarpenguin <soarpenguin@gmail.com>
+# First release Jan.3 2014
+##################################################
+# usage of iputils.pm, add code like:
+#   use lib "path"; #path is the file of iputils.pm 
+#   use iputils;
+##################################################
+
+package iputils;
+
+use FileHandle;
+use Getopt::Long;
+use Time::Local qw(timelocal);
+use Term::ANSIColor;
+use strict;
+$|=1;
+
+BEGIN {
+    use Exporter();
+    use vars qw($VERSION @ISA @EXPORT @EXPORT_OK);
+    $VERSION = 0.0.1;
+    @ISA = qw(Exporter);
+    @EXPORT = qw(
+        validate_ip ip2long long2ip ip2hex hex2ip
+        __FUNC__ __func__ get_now_time trim
+    );
+    @EXPORT_OK = qw(&mk_fd_nonblocking &get_winsize);
+}
+
+use constant true => 1;
+use constant false => 0;
+use constant MAX_IP => 0xffffffff;
+use constant MIN_IP => 0x0;
+
+sub validate_ip {
+    my $ip = shift;
+    my @array = ();
+
+    return false unless $ip;
+    
+    $ip = trim($ip);
+    if ($ip =~ /^(\d+\.){3}(\d+)$/) {
+        @array = split(/\./, $ip);
+        foreach my $i (@array) {
+             if ($i > 255 || $i < 0) {
+                return false;
+             }
+        }
+        return true;
+    }
+    return false;
+}
+
+sub ip2long {
+    my $ip = shift;
+    my $long = 0;
+    
+    my $ret = validate_ip($ip);
+    if ($ret == false) {
+        return $long;
+    }
+    
+    my @array = split(/\./, $ip);
+    foreach my $e (@array) {
+        $long = ($long << 8 | $e);
+    }
+    
+    return $long;
+}
+
+sub long2ip {
+    my $l = shift;
+
+    return "0.0.0.0" unless $l;
+
+    if ($l > MAX_IP or $l < MIN_IP) {
+        return "0.0.0.0";
+    }
+    
+    return sprintf("%d.%d.%d.%d", 
+        $l >> 24 & 255, $l >> 16 & 255, $l >> 8 & 255, $l & 255);
+}
+
+sub ip2hex {
+    my $netip = shift;
+
+    return "0.0.0.0" unless $netip;
+    $netip = ip2long($netip);
+
+    return sprintf("%08x", $netip);
+}
+
+sub hex2ip {
+    my $netip = shift;
+
+    #$netip = sprintf("%08x", $netip);
+
+    return long2ip($netip);
+}
+
+# set socket nonblocking.
+sub mk_fd_nonblocking {
+    use Fcntl qw(F_GETFL F_SETFL O_NONBLOCK);
+
+    my $fd = shift;
+    my $flags = fcntl($fd, F_GETFL, 0)
+        or warn "Can't get flags for the fd: $!\n";
+
+    $flags = fcntl($fd, F_SETFL, $flags | O_NONBLOCK)
+        or warn "Can't set flags for the fd: $!\n";
+}
+
+sub get_now_time {
+    my ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst) = localtime(time);
+    my $now_time = sprintf("%d.%d.%d %d:%d:%d", $year + 1900, $mon + 1, $mday, $hour, $min, $sec);
+
+    return "[$now_time]";
+}
+
+sub trim
+{
+    my $string = shift;
+    $string =~ s/^\s+//;
+    $string =~ s/\s+$//;
+    return $string;
+}
+
+# Retrieve the name of the current function
+sub __FUNC__ { (caller(1))[3] . '()' }
+# display the name of the current function
+sub __func__ { (caller(1))[3] . '(' . join(', ', @_) . ')' }
+
+1;