I have a couple sites that deal with broadband internet access, and I'm looking to monetize beyond adsense. I'd like to sign up for some affiliate programs from internet service providers like Charter, CenturyLink, Comcast, etc.

I found a couple affiliate programs but I am having no luck at all figuring out the programs that so many other websites are involved with.  In about every case, the user is able to enter in their address and then a search is performed, returning programs available at their location.  The programs I've found just do the traditional ad click-throughs for a possible commission.

Can anyone enlighten me what kind of programs they are using?