Why does my browser try to open ads from fwdsnp.com?

When I browse to some retail websites, my browser briefly directs to fwdsnp.com. From there it tries to open a popup and then forwards to the site that I actually want. I first noticed this with dell.com. I initially thought it was adware I had accidentally installed. However, it happens for all computers in my home and "fresh installs."

Why?


I spoke to my ISP. They said it is their DNS service that does this. They said if I don't like it I can use a different DNS service.