What does changing your IP do to your ISP?

I can change my IP though the router changing the MAC address, but how does this effect my ISP? is there any way to get in trouble by doing this? If so how would you get in trouble?What does changing your IP do to your ISP?
If you are talking about the external address that comes from your ISP, you would probably lose your connection. This address is provided by your ISP so that you can exist on the internet.



What would happen if you changed the address on your house to whatever you wanted it to be? Would people be able to find your house?... I don't mean people who already know where you live!



As for the MAC address, you cannot change that. Yes, there are ways to clone a MAC address, but that would normally be done with malicious intent.What does changing your IP do to your ISP?
You can't change your MAC address. If you change your IP, your ISP won't care. It's YOUR IP, not theirs.
It doesn't effect the ISP, it effects you. Your ISP provides you with your IP. Should you decide to change the assigned IP you will no longer have internet. However, if your intent is malicious, the NOC will catch you. I'm not giving security details away on social site.
Your ISP has a pool of external IP's.

Once you change MAC (if you have cable modem this shouldn't work from router), your ISP will release the assignment of your current IP and give you one from the pool.



Nothing really could come of this, but if you do it a few times a day you might get a phone call.