Just turn your ISP's router off then unplug it for about a half hour, Check what your IP is before and after you do this.
To find your IP go to google and type or paste
No need to click on any site it will be at the top of the resultsCode:What's my IP
Copy the IP of the first search and compare them. If they are different you are good to go, If not you are going to have to leave the power off longer next time.