Do you mean you want it so that you can make incoming connections to your home environment regardless of what your home IP is? If that's what you want, what you're looking for in a Dynamic DNS service. There's DynDNS, No-IP, and a slew of others out there.
In each case, you'll need a method of updating your home's WAN IP with your remote Dynamic DNS profile. This requires either manual updating by you, or by using an application that determines your WAN IP and updates your account automatically. It may be worth looking into your home router, and many home routers offer integration with several of the Dynamic DNS providers out there.
Either way, instead of using an IP, you'll use the Dynamic DNS domain name that you'll create during the setup process to access whatever you need.