i have found one software which hide your IP address every time and give you a new IP address by creating a Tor Network.
If u have Mozilla then it works very fine
First Download Vidalia Bundle from here
Here is link for Windows and MAC OS .So download it according to your requirement .After that to easily turn on and turn off TOR .. You can install Firefox add on from here :
then restart firefox.After that you will see at right bottom corner that your tor addon for mozilla is installed now when u want to hide your IP or want to surfing anonymously Turn on or turn off by clicking on this.
You can check your ip address here