I tried doing the ipconfig/release ipconfig/renew thing but that didn't change it. I tried unplugging the modem for about 10 minutes and that didn't do it.

How the hell can I change it? My ISP won't do it.

Do you have another network card?

Modems carry their own MAC address, so if your ISP won't change your IP, and you use a cable/dsl modem to connect to the Internet, then you're likely shit out of luck.

Did you get banned from somewhere? Regular forums like 4chan and the likes can usually be bypassed through proxy servers. BitTorrent trackers, you're pretty much screwed with.

If you swap NICs your modem will probably pull another IP address.

What's a NIC and how do I swap it?

Your network card is inside your computer, it's got the jack that you plug the modem into on the back of your computer. I'm guessing that you don't have a spare one and that you might be pretty much out of luck unless you can trick your computer somehow into thinking the NIC has a new MAC address. I don't have any idea whether this is possible or not and the gist of this post is basically

As far as I know, your NIC's MAC address only goes as far as the modem in terms of registering your connection. That's why you will maintain a connection to the network without having the originally registered MAC address as the client on the modem, but the client won't have network access until the modem is rebooted in order to register the new MAC.

On DSL accounts, your identity is verified, usually, by a PPPoE discovery involving the MAC address and account information stored on the DSL modem. So on DSL, unless you have at least a new account and possibly a new modem, you're stuck with the IP they give you unless they're willing to change it for you.

Cable modems and the remainder of DSL modems not on PPPoE use DOCSIS, which once again authenticates via the MAC address of the modem and something called BPI (which I don't at all understand, but I know its a hardwired method of authenticating which households are entitled to broadband service, rather than an account linked to your telephone number.) This is even harder to spoof because the guts of the customer-side BPI, I believe, reside in a utility box outside your home.

I may not be 100% right on all that, but I think that's the gist of it.

The bottom line though is that without a proxy, there's really no way to change your public IP without your ISP doing so for you.

I heard that when you turn off your modem your IP goes back to the ISP's IP pool. If no one else has picked up that IP before you turn your modem back on, you will most likely get that IP back. But if someone does pick up that IP you will get a different one.

Any truth here?

When I wiped my computer and reinstalled my broadband modem via software, I would get a different IP address every time. On that computer, it says I live in Tempe, which is like 30 miles east of Phoenix.