Although very few of us are actually in charge of our own IP addresses, there are some ways to force a change. Search the Internet and you'll be directed towards all sorts of arcane command-line magic words that will, allegedly, get you a new address. There are even some websites that can do the same. You can also disconnect your modem for a period of time, and see if your ISP assigns you a new address when you come back online. Or you can call your ISP directly and ask for a new address, but that might lead to some tedious questions.