Updated README.md.

Author: ip2location

README.md

@@ -30,15 +30,16 @@ Sample codes are given in this project, under **controllers** folder. You may ru
 
 ### BIN Database
 Use following codes in your application for get geolocation information.
-
+```
     // (optional) Define IP2Location database path. By default, the IP2LOCATION_DATABASE is pointed to *application/libraries/ip2location/IP2LOCATION-DB.BIN* if you choose not to change the original settings.
     define('IP2LOCATION_DATABASE', '/path/to/ip2location/database');
 
     $ipl = new IP2Location_lib();
     $countryCode = $ipl->getCountryCode('8.8.8.8');
+```
 
 Below are the methods supported for BIN data file lookup.
-
+```
     $countryCode = $ipl->getCountryCode($ip);
     $countryName = $ipl->getCountryName($ip);
     $regionName = $ipl->getRegionName($ip);
@@ -61,10 +62,11 @@ Below are the methods supported for BIN data file lookup.
     $usageType = $ipl->getUsageType($ip);
     $addressType = $ipl->getAddressType($ip);
     $category = $ipl->getCategory($ip);
+```
 
 ### Web Service
 Use following codes in your application for get geolocation information.
-
+```
     // (required) Define IP2Location API key.
     define('IP2LOCATION_API_KEY', 'your_api_key');
 
@@ -82,6 +84,25 @@ Use following codes in your application for get geolocation information.
 
     $ipl = new IP2Location_lib();
     print_r ($ipl->getWebService('8.8.8.8'));
+```
+
+### IPTools
+Use following codes in your application for get IPTools class information.
+```
+    $ipl = new IP2Location_lib();
+    var_dump($ipl->isIpv4('8.8.8.8'));echo '<br>';
+    var_dump($ipl->isIpv6('2001:4860:4860::8888'));echo '<br>';
+    print_r($ipl->ipv4ToDecimal('8.8.8.8'));echo '<br>';
+    print_r($ipl->decimalToIpv4(134744072));echo '<br>';
+    print_r($ipl->ipv6ToDecimal('2001:4860:4860::8888'));echo '<br>';
+    print_r($ipl->decimalToIpv6('42541956123769884636017138956568135816'));echo '<br>';
+    print_r($ipl->ipv4ToCidr('8.0.0.0', '8.255.255.255'));echo '<br>';
+    print_r($ipl->cidrToIpv4('8.0.0.0/8'));echo '<br>';
+    print_r($ipl->ipv6ToCidr('2002:0000:0000:1234:abcd:ffff:c0a8:0000', '2002:0000:0000:1234:ffff:ffff:ffff:ffff'));echo '<br>';
+    print_r($ipl->cidrToIpv6('2002::1234:abcd:ffff:c0a8:101/64'));echo '<br>';
+    print_r($ipl->compressIpv6('2002:0000:0000:1234:FFFF:FFFF:FFFF:FFFF'));echo '<br>';
+    print_r($ipl->expandIpv6('2002::1234:FFFF:FFFF:FFFF:FFFF'));echo '<br>';
+```
 
 ## Dependencies
 This module requires IP2Location BIN data file or IP2Location API key to function. You may download the BIN data file at