hi,
I need a software to change my ip address.Please can you tell me about any software?

You'll need to provide more details. What does "change my IP address" mean?

Do you mean your NIC's address, public IP, what? Are you trying to hide your IP from some target?

Im not to sure how to code a program to change your ip address, If I were to say you probably have to use asp.net or similar web development language that supports interconnectivity.

If you dont need to change it for every site, you could just use a proxy which are generally free Click Here

if you mean public ip address then can use online web proxy to change your public ip address try this out WholeProxy.com